How to Build a Rooftop Terrace

By Léa Plourde-Archer

Updated on November 7, 2023

Doesn't the idea of a rooftop terrace sound lovely? Of course it does and as a result, this project is becoming more and more common. This outdoor area can be turned into a pleasant and unique space for socializing and enjoying the sun.

However, before you launch this major renovation project, it's necessary to determine specific rules and techniques for the job. So look no further, as we've got some crucial information and a few tips on how to carry out your rooftop terrace project while keeping within a controlled budget.

Starting points for building a rooftop terrace

roof terrace

source: unsplash

The idea of a rooftop terrace is appealing for multiple reasons. Who doesn’t love the idea of enjoying a bit of sunshine with a drink in hand surrounded by family and friends? Of course, this project may be easier said than done. There are several considerations that need to take place before diving headfirst into this project. Ask yourself these questions:

  • Can your property roof and walls handle the weight of a terrace? This includes how it’s furnished, finished and with the weight of people on it.

  • Is a major reconstruction required? If your roof is slanted, major reconstruction will need to happen before you can build a terrace. Sloped roofs can be adjusted by building an external wall or cutting directly into the roof. If your roof is flat, the same needs and considerations will not be required.

  • Lastly, how do your neighbours feel about this project? In some municipalities, you may not be allowed to build a rooftop patio at all. If it is going to overlook their property, it will infringe on their privacy or could affect their skyline. Check with both your neighbours as well as local building codes to determine if you can move forward with this project in an amicable manner.

Do does the project require a transformation permit?

In many cities and municipalities, setting up a rooftop terrace requires a transformation permit. It is recommended that you contact your local authorities to know which permits are needed for your project and the rules that apply alongside the permit. For example, in Montreal, the terrace walls cannot exceed two meters in height. Further, the terrace needs to be placed a few meters away from the building façade. Lastly, the terrace must be set up at least 1.2 meters away from the property limits. These elements are of extreme importance and the failure to apply for the right permits can lead to legal recourse, so do your homework. 

How to determine the technical constraints to installing a rooftop terrace

It's highly recommended that you hire an architect for this type of endeavour, especially if it's going to come down to major roof reconstruction. An architect will calculate the load-bearing capacity of your roof and this will determine whether or not the rooftop terrace project is doable. For example, if you want to set up a garden on your roof, you will have to take into account the extra weight created by the wet soil, an aspect which might affect the size of the garden.

Respecting the weight limits will also affect the strategic choices concerning the materials that will be used for the staircase. Indeed, an aluminum staircase is much lighter than a steel staircase but it costs three times the price. As mentioned, be sure to consider the fact that you might have to turn your roof into a flat roof or that you might need to strengthen the current surface. There are a few cost-effective solutions, like pressure-treated wood posts which are installed on a styrofoam base.

rooftop terrace

Photo: Houzz

Budget for building a rooftop terrace

Investing in such a major renovation is not a trivial thing and serious consideration must be given to the budget of this project. To start, you should be aware that you'll likely spend upwards of at least $15 000 for this type of project. However, just think of the benefits! Your quality of life will improve, as the addition of a safe haven will make you feel like you’ve travelled outside of the city for a moment. If you have a limited budget, you will probably opt for a rooftop terrace made of wood.

With this type of setup, once the building’s structure has been modified, the next step will be to install a floor and a draining system. If your budget allows you to do so, you can opt for a rooftop terrace with white gravel, but if the building isn’t already equipped with a white membrane, one will have to be put in.

Ultimately, the most expensive rooftop terrace is the type that includes a membrane and layers of vegetable substrate. Building a terrace on your roof is not an easy thing to do but it is a worthy investment as this type of project adds a lot of value to a house and will be a great selling argument. 

Get 3 renovation quotes for your rooftop terrace project

RenoQuotes.com can help you get quotes for your rooftop terrace projectIf you submit your project to us, we’ll put you in contact with 3 qualified professionals. Fill in the form on our homepage (it only takes a few minutes), and you will receive quotes from trusted professionals. 

Dial 1-844 828-1588 to speak with one of our customer service representatives


Get 3 free quotes for your project!

Submit a project and get 3 free quotes!

Looking for something else?

Table of contents

4 min read

Get 3 free quotes for your project!

Submit a project and get 3 free quotes!

Are you a contractor?

Join our network and receive real leads!

Download the price guide for renovations

We’ll be emailing you the latest market price guide for renovations.



Related articles

The latest industry news, interviews, technologies, and resources.

5 min read

Editorial Team

06 Feb 2024

Patio Design Tips and Materials

Should you be lacking inspiration when it comes to planning your home improvement project, there is no reason to put so much pressure on yourself because you are definitely not alone in the boat! That is why, nowadays, there are several different platforms on the internet that are dedicated to providing different inspirational ideas for any given project.

Exterior renovations
6 min read

Karine Dutemple

07 Nov 2023

How to Prepare Your Yard for Spring

Naturally, one welcomes spring with open arms after such a harsh winter. If this magnificent season brings with reason its share of small pleasures, it also brings with it many essential tasks to accomplish to prepare your backyard well for the arrival of warm weather. Learn how to proceed with your backyard spring cleaning. 

5 min read

Editorial Team

07 Nov 2023

5 Useful Tips to Paint a Kitchen or a Bathroom

Although kitchens and bathrooms are two distinct rooms with very different features, they both require a specific type of paint. Learn more about why regular paint isn't appropriate for these rooms: 

Paint
5 min read

Editorial Team

25 Nov 2024

5 things to know before building a home in the country

Planning and building a brand new home from the ground up is always an exciting venture. Of course, each home-build project is unique and will follow a specific set of rules and regulations. Where you build your home will dictate many of these regulations, as urban homes will have different needs than those constructed in rural areas.

7 min read

Editorial Team

16 Sep 2024

Bigenerational Home: 7 Must-Know Facts Prior to Undertaking Such a Project

Are you hoping to build a bigenerational home to take care of your elderly parents? Albeit it’s only logical to believe that one will be able to benefit from this cohabitating situation, it’s, nonetheless, a rather large-scale project. 


Looking for a contractor?

Submit a project and get 3 free quotes now!