Home Extension Contractors in Cobalt

Get up to 3 free quotes from certified contractors in your area by completing our online form.

Group of avatars

4.6

from 200+ reviews

Decorative squiggly line
How it Works
Tell us about your project

Tell us about your project and submit the form in less than 5 minutes.

Get in touch with contractors

We put you in contact with 3 certified contractors.

Choose a contractor

Compare the different quotes, choose the best contractor, and save time and money.

Here are some Home Extension Contractors in Cobalt, Ontario

RockSolid Demolition and Renovations
10-1338 Wellington St. W , Ottawa, K1Y 3B7
5
|1 Reviews
Home extension
Attic insulation
Balcony & Landscaping
Balcony and/or Patio (material advice)

With over 30 years of experience, Rocksolid Demolition & Renovations is Eastern Ontario’s premier choice for high-quality home transformations. Based in Ottawa, we serve a broad 300km radius—including Kanata, Orleans, Kingston, and the Ottawa Valley—bringing expert craftsmanship directly to your doorstep.We specialize in full-service residential projects, including professional demolition, custom kitchen and bathroom remodeling, basement finishing, and roofing. Whether you’re planning a structural overhaul or a modern refresh, our team ensures every project is licensed, insured, and code-compliant.We believe your dream home should be affordable, which is why we offer flexible financing options for as low as $47 a month. You can even prequalify instantly through our website to get your project moving faster.At Rocksolid, we treat your home like our own, using professional protection to keep your space clean and a transparent process to keep your budget on track. From the first consultation to the final inspection, we deliver results that are truly rock solid.Contact us today at (613) 581-9894 or visit rocksolidrenos.com to book your free estimate!

Member Since 2025
Home extension
Attic insulation
Balcony & Landscaping
Balcony and/or Patio (material advice)

With over 30 years of experience, Rocksolid Demolition & Renovations is Eastern Ontario’s premier choice for high-quality home transformations. Based in Ottawa, we serve a broad 300km radius—including Kanata, Orleans, Kingston, and the Ottawa Valley—bringing expert craftsmanship directly to your doorstep.We specialize in full-service residential projects, including professional demolition, custom kitchen and bathroom remodeling, basement finishing, and roofing. Whether you’re planning a structural overhaul or a modern refresh, our team ensures every project is licensed, insured, and code-compliant.We believe your dream home should be affordable, which is why we offer flexible financing options for as low as $47 a month. You can even prequalify instantly through our website to get your project moving faster.At Rocksolid, we treat your home like our own, using professional protection to keep your space clean and a transparent process to keep your budget on track. From the first consultation to the final inspection, we deliver results that are truly rock solid.Contact us today at (613) 581-9894 or visit rocksolidrenos.com to book your free estimate!

Member Since 2025
A&C Design Landscape
Toronto
5
|1 Reviews
Home extension
Balcony & Landscaping
Balcony and/or Patio (material advice)
Basement renovations

Quality renovation service for over 10+ years throughout the GTA. We take pride in our work and complete every home renovation as if it were our own.

Member Since 2024
Home extension
Balcony & Landscaping
Balcony and/or Patio (material advice)
Basement renovations

Quality renovation service for over 10+ years throughout the GTA. We take pride in our work and complete every home renovation as if it were our own.

Member Since 2024
Rocaus
Ottawa, K2W 1B8
5
|1 Reviews
Home extension
Architect
Architectural technologist
Attic insulation

  Teamwork ... I believe in the power of working together as a team to deliver the best results for our clients. Our team is made up of Contractors, Paid staff members, and Specialized trade members, all working together to ensure a smooth project build for our clients. We are passionate about what we do and strive to exceed our clients’ expectations.   You can have peace of mind when working with us because we are fully licensed and insured. This means that should anything unexpected happen, we have the proper coverage to protect both ourselves and our clients. Our license shows that we are trained and qualified to carry out the work we provide, while our insurance protects you from any liability claims or damages that may occur during the project   General Construction, renovations. Retaining walls Framing Electrical Plumbing services Exterior weatherproofing Demolition / Grading / Excavation ​Architectural and Engineering designs Custom Tile Commercial redevelopment residential redevelopment

Member Since 2023
Home extension
Architect
Architectural technologist
Attic insulation

  Teamwork ... I believe in the power of working together as a team to deliver the best results for our clients. Our team is made up of Contractors, Paid staff members, and Specialized trade members, all working together to ensure a smooth project build for our clients. We are passionate about what we do and strive to exceed our clients’ expectations.   You can have peace of mind when working with us because we are fully licensed and insured. This means that should anything unexpected happen, we have the proper coverage to protect both ourselves and our clients. Our license shows that we are trained and qualified to carry out the work we provide, while our insurance protects you from any liability claims or damages that may occur during the project   General Construction, renovations. Retaining walls Framing Electrical Plumbing services Exterior weatherproofing Demolition / Grading / Excavation ​Architectural and Engineering designs Custom Tile Commercial redevelopment residential redevelopment

Member Since 2023
Whiteline
61 Mallery, Toronto, L4S 0J1
5
|1 Reviews
Home extension
Basement renovations
Basement renovations
Bathroom renovations

Whitelineco is a trusted renovation company based in Ontario, specializing in residential and commercial remodeling projects. We offer a wide range of renovation services including bathroom upgrades, kitchen remodeling, basement finishing, flooring, drywall, painting, and more. With a strong focus on craftsmanship, reliability, and customer satisfaction, our team is dedicated to transforming your space with precision and care. Whether it’s a small repair or a full-scale renovation, Whiteline ISJ delivers high-quality results on time 

Member Since 2025
Home extension
Basement renovations
Basement renovations
Bathroom renovations

Whitelineco is a trusted renovation company based in Ontario, specializing in residential and commercial remodeling projects. We offer a wide range of renovation services including bathroom upgrades, kitchen remodeling, basement finishing, flooring, drywall, painting, and more. With a strong focus on craftsmanship, reliability, and customer satisfaction, our team is dedicated to transforming your space with precision and care. Whether it’s a small repair or a full-scale renovation, Whiteline ISJ delivers high-quality results on time 

Member Since 2025
MN Homes
332 Orvis Crescent, Brampton, L9V 3E6
4.5
|2 Reviews
Home extension
Balcony & Landscaping
Balcony and/or Patio (material advice)
Basement renovations

MN Homes has an exceptional professional team that brings a positive impact to renovating your complete home, whether it's kitchen, bathroom, or basement. We are passionate about handling every project with ease. Our process is unique and transparent, bringing your imaginary design into life.

Member Since 2019
Home extension
Balcony & Landscaping
Balcony and/or Patio (material advice)
Basement renovations

MN Homes has an exceptional professional team that brings a positive impact to renovating your complete home, whether it's kitchen, bathroom, or basement. We are passionate about handling every project with ease. Our process is unique and transparent, bringing your imaginary design into life.

Member Since 2019
9468-7290 Québec inc
4-380 Dorval, Lavaltrie, J5W 3A3
4
|1 Reviews
Home extension
Air duct cleaning
Attic insulation
Balcony & Landscaping

9468-7290 Québec inc est votre expert local en Après-sinistre, Béton, Climatisation, Commercial, Conduits d'aération, Cuisine, Décontamination, Démolition, Excavation, Excavation intérieur, Fondation, Garage, Gypse, Plancher, Rénovation générale, Revêtement extérieur, Salle de bain, Sous-sol, Tourbe, Ventilation dans les secteurs de Lanaudière,Laurentides,Laval,Mauricie,Montérégie,Montréal,Northeastern Ontario,Outaouais, combinant expérience, innovation et rigueur. Nous privilégions la transparence, l'écoute et l'efficacité pour bâtir des relations de confiance avec nos clients. Demandez votre soumission personnalisée et démarrez votre projet en toute confiance.

Member Since 2022
Home extension
Air duct cleaning
Attic insulation
Balcony & Landscaping

9468-7290 Québec inc est votre expert local en Après-sinistre, Béton, Climatisation, Commercial, Conduits d'aération, Cuisine, Décontamination, Démolition, Excavation, Excavation intérieur, Fondation, Garage, Gypse, Plancher, Rénovation générale, Revêtement extérieur, Salle de bain, Sous-sol, Tourbe, Ventilation dans les secteurs de Lanaudière,Laurentides,Laval,Mauricie,Montérégie,Montréal,Northeastern Ontario,Outaouais, combinant expérience, innovation et rigueur. Nous privilégions la transparence, l'écoute et l'efficacité pour bâtir des relations de confiance avec nos clients. Demandez votre soumission personnalisée et démarrez votre projet en toute confiance.

Member Since 2022
Raffaele Castaldo General Contracting Inc.
Toronto
Home extension
Basement renovations
Basement renovations
Bathroom renovations

Need a team you can trust for Basement, Bathroom, Commercial, Flooring, Garage remodeling, General renovation, Gypsum, Home adaptation, Home extension, Interior masonry, Kitchen, Post-disaster in Central Ontario,Eastern Ontario,Golden Horseshoe,Northeastern Ontario,Southwestern Ontario? Big or small, each project is handled with care, respect, and a strong attention to detail. Take the first step toward a better project experience — contact us now. At Raffaele Castaldo General Contracting Inc., we’re driven by the belief that every client deserves exceptional service and lasting results.

Member Since 2021
Home extension
Basement renovations
Basement renovations
Bathroom renovations

Need a team you can trust for Basement, Bathroom, Commercial, Flooring, Garage remodeling, General renovation, Gypsum, Home adaptation, Home extension, Interior masonry, Kitchen, Post-disaster in Central Ontario,Eastern Ontario,Golden Horseshoe,Northeastern Ontario,Southwestern Ontario? Big or small, each project is handled with care, respect, and a strong attention to detail. Take the first step toward a better project experience — contact us now. At Raffaele Castaldo General Contracting Inc., we’re driven by the belief that every client deserves exceptional service and lasting results.

Member Since 2021
DHS Flooring and Contracting
null Radenhurst Crescent, Barrie, L4M 6C6
Home extension
Attic insulation
Balcony & Landscaping
Balcony and/or Patio (material advice)

General contractor with over 15 years of experience specializing in all aspects of renovations and construction. We have licensed plumbers, HVAC, and electricians as well to guarantee a smooth and timely finish to all of your construction needs.

Member Since 2025
Home extension
Attic insulation
Balcony & Landscaping
Balcony and/or Patio (material advice)

General contractor with over 15 years of experience specializing in all aspects of renovations and construction. We have licensed plumbers, HVAC, and electricians as well to guarantee a smooth and timely finish to all of your construction needs.

Member Since 2025
Relica Comforts
Apsley
Home extension
Air duct cleaning
Balcony & Landscaping
Balcony and/or Patio (material advice)

SINCE 2022 we’ve been about creating a solution for the worlds inhabitants, (human WITH pet(s) ...if one has any …To enjoy a life on earth at their best capability …In order to not only sustain a well balanced healthy life on our earth NOW IN DAYS …  …BUT …  …The most vivid comfortability indoors  …AND EVEN CREATED FOR OUTDOORS, (when we’re just too busy to continually go out & camp …Sight see …Enjoy the condense environmental world …AND EVEN HELP THE ANIMALS in the “ever growing economy” out there!)  …HOW may this be with pets you may think?  …IT CAN SIMPLY BE DONE BY using our imaginations to give A HABITAT SOLUTION shaped out for our loved ones, (human with pet(s) …)  …A solution shaped out to install OR renovate our most honoured spaces with enravelled comfort …Heathliness throughout the changing earth …  …AND LAST BUT NOT LEAST …  …ENJOYMENT on all possible levels “we are capable of NOW IN DAYS …”  …Furthermore with the help from us!  Learn more today about what we have to offer our “ever changing globe” out there …  …WITH YOURS & OUR thriving installment plans for the future!

Member Since 2024
Home extension
Air duct cleaning
Balcony & Landscaping
Balcony and/or Patio (material advice)

SINCE 2022 we’ve been about creating a solution for the worlds inhabitants, (human WITH pet(s) ...if one has any …To enjoy a life on earth at their best capability …In order to not only sustain a well balanced healthy life on our earth NOW IN DAYS …  …BUT …  …The most vivid comfortability indoors  …AND EVEN CREATED FOR OUTDOORS, (when we’re just too busy to continually go out & camp …Sight see …Enjoy the condense environmental world …AND EVEN HELP THE ANIMALS in the “ever growing economy” out there!)  …HOW may this be with pets you may think?  …IT CAN SIMPLY BE DONE BY using our imaginations to give A HABITAT SOLUTION shaped out for our loved ones, (human with pet(s) …)  …A solution shaped out to install OR renovate our most honoured spaces with enravelled comfort …Heathliness throughout the changing earth …  …AND LAST BUT NOT LEAST …  …ENJOYMENT on all possible levels “we are capable of NOW IN DAYS …”  …Furthermore with the help from us!  Learn more today about what we have to offer our “ever changing globe” out there …  …WITH YOURS & OUR thriving installment plans for the future!

Member Since 2024
 HOLLER DRYWALL AND RENOVATIONS
173 CENTRE ST UNIT A, L0M 1B0
Home extension
Basement insulation
Basement renovations
Basement renovations

Holler drywall and renovations was officially launched in August 2025. It's family run by myself Blair Holler and my wife Sara I have over 20 years experience in every aspect of home construction and renovations as well as commercial Framing and drywall installation. I specialize in drywall installation and finishing but also have strong skills in all interior finishing flooring painting trim as well as exterior window installation door installation siding shingles and Foundation repair and drainage. We are dedicated to making sure our clients are happy and taken care of giving them the result they wanted in a timely fashion

Member Since 2026
Home extension
Basement insulation
Basement renovations
Basement renovations

Holler drywall and renovations was officially launched in August 2025. It's family run by myself Blair Holler and my wife Sara I have over 20 years experience in every aspect of home construction and renovations as well as commercial Framing and drywall installation. I specialize in drywall installation and finishing but also have strong skills in all interior finishing flooring painting trim as well as exterior window installation door installation siding shingles and Foundation repair and drainage. We are dedicated to making sure our clients are happy and taken care of giving them the result they wanted in a timely fashion

Member Since 2026
Doane Construction and Renovations Incorporated
9 - 325 Erb Street West , Waterloo, N2L 1W4
Home extension
Architect
Attic insulation
Awning

Doane Construction and Renovations INC. is a small waterloo based company. We have a small but highly effective team filled with people who are driven by quality and integrity. Our customers trust us to bring the skills and know how to complete thier project on time and on budget and have grown to exspect only the higest quality from us.

Member Since 2018
Home extension
Architect
Attic insulation
Awning

Doane Construction and Renovations INC. is a small waterloo based company. We have a small but highly effective team filled with people who are driven by quality and integrity. Our customers trust us to bring the skills and know how to complete thier project on time and on budget and have grown to exspect only the higest quality from us.

Member Since 2018
Elite Star General Contracting Ltd
4430-285 Taunton Rd E, Oshawa, L1G 3V2
Home extension
Basement renovations
Basement renovations
Bathroom renovations

At Elite Star General Contracting Ltd, we believe every Basement, Bathroom, Commercial, Garage remodeling, General renovation, Home extension, House construction, Kitchen, Post-disaster project deserves full dedication and care. Big or small, each project is handled with care, respect, and a strong attention to detail. Ready to make progress? Let's discuss your project. At Elite Star General Contracting Ltd, we’re driven by the belief that every client deserves exceptional service and lasting results.

Member Since 2025
Home extension
Basement renovations
Basement renovations
Bathroom renovations

At Elite Star General Contracting Ltd, we believe every Basement, Bathroom, Commercial, Garage remodeling, General renovation, Home extension, House construction, Kitchen, Post-disaster project deserves full dedication and care. Big or small, each project is handled with care, respect, and a strong attention to detail. Ready to make progress? Let's discuss your project. At Elite Star General Contracting Ltd, we’re driven by the belief that every client deserves exceptional service and lasting results.

Member Since 2025
Golden Peak Construction
950 barry avenue, L0L 1W0
Home extension
Basement renovations
Culvert
Deck

Golden Peak Construction is a trusted framing company with extensive experience in residential and light commercial construction across Ontario.We specialize in delivering strong, precise, and high-quality framing for walls, floors, roofs, decks, garages, and additions.Our team is committed to providing reliable, fast, and safe workmanship on every project.Whether you're building a new home, expanding your living space, or upgrading your property, Golden Peak Construction provides professional service and attention to detail from start to finish.

Member Since 2026
Home extension
Basement renovations
Culvert
Deck

Golden Peak Construction is a trusted framing company with extensive experience in residential and light commercial construction across Ontario.We specialize in delivering strong, precise, and high-quality framing for walls, floors, roofs, decks, garages, and additions.Our team is committed to providing reliable, fast, and safe workmanship on every project.Whether you're building a new home, expanding your living space, or upgrading your property, Golden Peak Construction provides professional service and attention to detail from start to finish.

Member Since 2026
Alldesignconstruction
10 Hart cres , London, N6E 2W6
Home extension
Balcony & Landscaping
Balcony and/or Patio (material advice)
Basement renovations

Alldesign is one of a kind company we specialize in custome craftsmanship we like thinking out side of the box to give r customers something different and unique we have been around for 14 years plus with 25 years experience in the construction field we injoy working with r customers in the project from start to finish making there dreams a reality 

Member Since 2020
Home extension
Balcony & Landscaping
Balcony and/or Patio (material advice)
Basement renovations

Alldesign is one of a kind company we specialize in custome craftsmanship we like thinking out side of the box to give r customers something different and unique we have been around for 14 years plus with 25 years experience in the construction field we injoy working with r customers in the project from start to finish making there dreams a reality 

Member Since 2020
D.A.R.T SERVICES
null null, Toronto, null
Home extension
Attic insulation
Balcony & Landscaping
Balcony and/or Patio (material advice)

GENERAL CONTRACTING AND ASBESTOS REMOVAL SERVICESD.A.R.T. Services is a registered entity with WSIB coverage. We maintain up-to-date business insurance and hold a 100% completion rate for all our projects. We are also accredited by the Better Business Bureau (BBB ID#: 1408465).Services offered:-interior and/or exterior demolition and selective deconstruction-deck and/or hardwood staining and refinishing, polishing or buffing-asbestos abatement, removal, and disposal-snow removal-waterproofing-asbestos material testing; air clearance test; DSS report-site clean up/post-renovation cleaning-general labor-painting-mold remediationCALL: 647 913 6476 and ask for "RICH"INSTAGRAM: @DEMO.CONTRACTING.TORONTOTIK TOK: @DARTSERVICESWEB: http://www.dartdemolition.ca/YOUTUBE: https://www.youtube.com/channel/UCj8J5itAzZsmqSwAfzxjf9QFACEBOOK: https://www.facebook.com/demo.contracting.toronto#torontocontractor #GTA #waterproofing #demolitionservices #homerenovation #torontoconstruction #LOVE #generalcontractor #abatement #homedepot #asbestosremoval #mold #roof #contractor #photography #TorontoRealEstate #bbb #torontorenovation #ınstagood #followforfollowbackinstantly #smallbusiness #dartservices #toronto #construction #ontario #painting #beautiful #snowremoval

Member Since 2025
Home extension
Attic insulation
Balcony & Landscaping
Balcony and/or Patio (material advice)

GENERAL CONTRACTING AND ASBESTOS REMOVAL SERVICESD.A.R.T. Services is a registered entity with WSIB coverage. We maintain up-to-date business insurance and hold a 100% completion rate for all our projects. We are also accredited by the Better Business Bureau (BBB ID#: 1408465).Services offered:-interior and/or exterior demolition and selective deconstruction-deck and/or hardwood staining and refinishing, polishing or buffing-asbestos abatement, removal, and disposal-snow removal-waterproofing-asbestos material testing; air clearance test; DSS report-site clean up/post-renovation cleaning-general labor-painting-mold remediationCALL: 647 913 6476 and ask for "RICH"INSTAGRAM: @DEMO.CONTRACTING.TORONTOTIK TOK: @DARTSERVICESWEB: http://www.dartdemolition.ca/YOUTUBE: https://www.youtube.com/channel/UCj8J5itAzZsmqSwAfzxjf9QFACEBOOK: https://www.facebook.com/demo.contracting.toronto#torontocontractor #GTA #waterproofing #demolitionservices #homerenovation #torontoconstruction #LOVE #generalcontractor #abatement #homedepot #asbestosremoval #mold #roof #contractor #photography #TorontoRealEstate #bbb #torontorenovation #ınstagood #followforfollowbackinstantly #smallbusiness #dartservices #toronto #construction #ontario #painting #beautiful #snowremoval

Member Since 2025

Are you looking for contractors in a nearby city?

Are you looking for another type contractor?

Expand Your Living Space With Confidence With Our Verified Experts

A New Chapter for Your Property, in Trusted Hands

Whether your family is growing or you simply dream of having more room to breathe in your everyday life, a home extension is one of the best ways to transform your current property without dealing with the inconvenience of moving.

However, this type of major renovation involves nearly every aspect of construction. From excavating new foundations and building the structural frame to repairing or extending the roof, coordinating the work requires flawless technical expertise.

Finding the right general contractor to manage a project of this scale can quickly become a source of stress for homeowners. Our platform is specifically designed to eliminate that uncertainty and simplify the process.

We connect you directly with professionals recognized for their rigorous project management, helping you create a safe and comfortable new living space while reducing the risk of unpleasant surprises and construction defects.

A home extension is a major project that requires careful planning, from assessing your architectural needs to obtaining all required permits. To learn about every crucial stage of the process and help ensure the success of your project, read our detailed checklist: Home Addition or Extension: Your Go-To Project Checklist

A Verified Network in Quebec and Across Canada

To provide you with a smooth and highly secure experience, our service quickly connects you with three qualified contractors ready to take charge of your home extension project.

In Quebec, every general construction company must complete a rigorous screening process before joining our exclusive network. We systematically verify that each contractor holds a valid licence issued by the Régie du bâtiment du Québec, or RBQ. We also confirm the company’s legal corporate status, verify the absence of criminal records or professional disputes, and carefully review its history of customer feedback. In addition to an RBQ licence, a home extension contractor may need other qualifications and authorizations, such as a CCQ competency certificate and municipal permits.

The same high standard of protection applies to homeowners in other regions of the country. Our selection criteria are adapted to local regulatory authorities, particularly in Ontario, Alberta and British Columbia. This gives you greater confidence that the professionals entering your home are trustworthy and committed to complying with applicable building codes.

Frequently Asked Questions About Home Extensions

What Factors Influence the Scope of a Home Extension Project?

Several technical factors must be carefully evaluated when planning your extension.

Your municipality’s zoning regulations, the structural condition of your current home and the accessibility of your property will all affect the architectural options available to you.

Whether you are considering a side addition, a second-storey extension or an addition supported by helical piles, the complexity of the structural work and your choice of finishing materials will directly influence the overall scope of the project.

Having these factors assessed by a qualified general contractor is one of the best ways to develop a realistic plan and avoid unexpected complications.

To explore all the elements that should be considered before having your plans prepared and to determine whether an extension may be more advantageous than moving, read our complete guide: Home Extension or Addition - How to Gauge Budgetary Needs?

Why Is It Essential to Hire an Architect or Architectural Technologist for a Home Extension?

A residential extension requires thorough technical and architectural planning.

The expertise of a certified professional is essential for confirming the structural feasibility of your ideas, preparing accurate plans and reducing the risk of having your permit application rejected by the municipality.

In addition to helping ensure the strength and safety of the new structure, these professionals optimize the space and design so the addition blends seamlessly with the existing building.

Their involvement helps support a well-coordinated construction process from beginning to end.

To learn how these professionals can turn your vision into reality and better understand the differences between their respective services, read our specialized guide: Home Extension Architect – What You Need to Know

What Are the Benefits of Choosing Helical Pile Foundations for a Home Extension?

Helical piles are an excellent alternative to traditional concrete foundations for supporting a new ground-level room, sunroom or lightweight extension.

This method requires minimal excavation, helping preserve the appearance of your yard and reducing the need for heavy machinery that could damage the property.

When installed by qualified professionals and securely anchored below the frost line, steel helical piles provide excellent structural stability during demanding seasonal freeze-and-thaw cycles.

Because there is no curing or drying period, carpentry work can begin shortly after installation, allowing the project to move forward efficiently.

To learn more about the engineering requirements, compatible types of extensions and whether this foundation method is suitable for your property, read our complete guide: Home Addition on Piles in Quebec: Guide and Prices