House extension contractor

Building your dream by the cubic meter

Entrepreneur agrandissement maison 1

A Beautifully Designed Turnkey Home Extension

With over 25 years of expertise in expansion projects in Montreal, we have built an experienced team comprising architects, engineers, technologists, surveyors, designers, and contractors. This team offers you a turnkey service that covers all stages, from planning to the execution of the work.

Types of House Extensions and Additions:

  • 4-season house extensions
  • House floor additions
  • Side house extensions
  • Extensions on piles
  • Extensions for a bedroom, kitchen, living room, basement, or other rooms
  • Duplex extensions
  • Adding a garage
  • And much more


For large-scale projects where innovation and seamless integration are essential elements, we always rely on our trusted partners. As a general construction contractor, we oversee all stages of your residential renovation project in Greater Montreal, regardless of its size! 

Their expertise and experience enable us to create high-quality technical plans for your home, with a focus on innovation, volumetrics, and brightness.

We are committed to providing a personalized approach for each house extension project, ensuring that they are unique for our clients. Our goal is to achieve aesthetically pleasing, functional, and exceptional renovations, integrating innovative elements, abundant light, and harmonious design.

Thanks to the skills and knowledge of our partners, we have the ability to bring your boldest dreams to life, whether it’s expanding your home or renovating it. Furthermore, their expertise in residential architecture is widely recognized.

It is important to note that all architects we work with are members of the Order of Architects of Québec, guaranteeing their professionalism and adherence to established standards.

Housing needs evolve, and your interior spaces can too!

RÉNO M3 stands out for its remarkable ability to offer house extension solutions that exceed expectations, aiming to elevate the comfort of homes. With our unparalleled expertise in construction and renovation, we understand that needs evolve with time, and we strive to turn every expansion project into an exceptional reality.

Whether you are considering expanding your living space, adding an extra floor, or completely rethinking the layout of your home, RÉNO M3 positions itself as a trustworthy partner. Our dedicated team of technologists, architects, designers, and specialized contractors work closely together to design customized solutions that meet your specific needs.

At RÉNO M3, we not only create additional physical spaces, but we also seek to enhance the quality of life within your home. We make it a point to integrate high-quality materials, adhere to the highest design standards, and meticulously manage timelines and budgets.

Whether your home expansion project aims to accommodate family growth, create versatile spaces, or simply improve your daily environment, RÉNO M3 is committed to exceeding your expectations. Choosing RÉNO M3 as a house extension contractor means opting for a transformation that goes beyond mere construction, offering a new dimension of comfort and living experience within your home.

A solution for every type of need in house extensions:

A workspace

In the current era, households increasingly feel the need to integrate a separate workspace within their interiors. The idea of working from the kitchen table is now a thing of the past. To optimize productivity and foster a clear separation between the professional and personal spheres, creating a dedicated workspace becomes a priority.

This dedicated space offers much more than just a working area. It provides a sanctuary conducive to concentration, creativity, and professional efficiency. By setting up an ergonomic and functional workspace, households can not only enhance their productivity but also establish a crucial balance between work and personal life.

Let us bring you a modern approach to remote work, addressing the growing needs for efficiency and well-being within your home.

A new bedroom

With the arrival of a new member in the family, space needs evolve. Whether it’s to accommodate overnight guests or for yourself, RÉNO M3 offers tailored house extension solutions that fit your existing space and lifestyle. Our team of construction and renovation experts is dedicated to creating customized solutions that optimize the use of your space, ensuring the comfort and functionality required to accompany every stage of family life. Transform your home to meet these new needs with the expertise of RÉNO M3.

A garage for the winter or a space for your bicycles

Do you feel the need for storage space for your vehicle(s) during the winter? This space can be versatile and adaptable depending on the seasons. Solutions are available for homeowners, and our qualified team is here to assist you in bringing your house expansion projects to life, meeting your specific needs.

RÉNO M3 guaranties for the extension of your home in Montréal

At RÉNO M3, we guarantee results that meet your expectations thanks to our commitment to quality execution. Our company is renowned for its reliability, with a team of conscientious professionals who oversee every step of your project. You can trust our commitment to excellence and be assured of reliable and quality service when contracting RÉNO M3 for a house extension.

Turnkey house extension

With RÉNO M3, you benefit from a turnkey service, freeing you from any worries and tasks to take care of. Our team takes care of all stages of the project management, from planning to final completion. You can rest assured knowing that we take care of all the details, from coordinating the work to supervising the craftsmen.

An expansion project delivered on schedule as promised

Our commitment to our customers is to deliver their project within the agreed upon timeframe. We understand the importance of this project to you, which is why we have implemented an efficient and reliable logistics system to ensure a flawless delivery. From order placement to final installation, our team is committed to meeting the agreed upon deadlines, in order to provide you with an exceptional customer experience and complete satisfaction.

After sales service

We are aware that customer service plays a crucial role in your overall satisfaction as a client. That is why we are committed to providing you with an exceptional experience and exceeding your expectations. We want you to be fully satisfied with your house extension. We understand that your time is valuable, which is why we strive to provide you with fast and efficient service. Our team will do everything possible to resolve any issues you may have promptly so that you can fully enjoy our products or services.

Our portfolio to meet your house extension contractor needs

Get inspired with our previous house extension success stories!

The 5 steps for an expansion project tailored to your needs

Our architects intervene in the design phase of your renovation project. Based on your needs, environment, and lifestyle, they develop house layout plans that include creating bright spaces, organizing rooms, and ensuring ergonomics. Throughout the expansion renovation, the renovation contractor relies on these architectural plans, which include the structure, exterior and interior finishes, joinery, plumbing, and electricity.

The architects also create 3D plans to give you a preview of the finished result. This collaboration allows us to propose personalized solutions for each space in your home that meet the highest industry standards of quality in renovation.

It is based on the architectural plans that the RÉNO M3 team properly organizes each step of the renovation project. Our dedicated interior design team creates functional concepts that take into account the spaces defined by the architect. Our project management expertise and extensive field experience enable us to execute house plans and house or condo extensions while adhering to the strictest construction standards.


Preliminary analysis

Our expansion architect begins by understanding the client’s needs, goals, and constraints. They perform a detailed analysis of the house extension project, evaluating the requirements in terms of space, functionality, and style. This step helps define a clear vision for the project and establish the objectives to be achieved.



Based on the information gathered during the preliminary analysis phase, the architect develops concepts and ideas for the project design. They create plans, sketches, and models to visually represent the proposed design. This stage involves discussions and adjustments in collaboration with the client to achieve a final design.


The documentation and budget

Once the concept is finalized, our architect proceeds to create detailed documents and drawings to describe the technical specifications of the project. These documents include plans, sections, elevations, and details, as well as material and construction specifications. These documents are essential for the construction permit application and for RÉNO M3 to carry out the construction project. Additionally, it is at this stage that we will evaluate budgets.


Project Planning

Planning and Orders : Once the creative solution is defined and the materials are chosen, the planning stage begins. This involves developing detailed plans for the project, placing orders with suppliers, and creating a GANTT project schedule for seamless project management.


Project management on the construction site

Project management on the construction site is a crucial step in the realization of a renovation project. It involves strict adherence to the established schedule, ensuring that the work is completed within the agreed-upon timeframe. Furthermore, a respectful team on the site plays an essential role in creating a harmonious and professional work environment, thus facilitating effective collaboration and a successful project.

Des outils de planification pour la rénovation de votre maison

Rénover une ou plusieurs pièces de sa résidence représente un investissement majeur. Sans une bonne planification, le scénario tourne rapidement à la catastrophe. Notre équipe de designers d’intérieur saura vous conseiller pour l’aménagement, le design, ainsi que l’agencement des matériaux pour votre projet.

Avant de venir nous rencontrer, nous vous invitons à bien réfléchir à votre projet. Ces deux outils d’aide à la réflexion vous seront très utiles pour ne rien oublier et pour mieux vous préparer à votre première rencontre. Apportez-les lors de votre visite chez RénoM3, ils guideront aussi votre designer d’intérieur!

Afin de vous assurer qu’un designer d’intérieur sera disponible pour vous, nous vous recommandons fortement de prendre rendez-vous avant de vous déplacer.

Our expertise in expansion projects

It’s becoming increasingly common to find that many people have a growing need for more living space. Whether to meet the needs of a growing family or simply to improve their quality of life, the importance of having sufficient space cannot be underestimated. Interestingly, some people prefer to stay in their current neighborhoods and not move, highlighting the positive impact that the local environment can have on our well-being. In conclusion, whether you’re looking to extend your home for more space, to accommodate a larger family or simply to improve your quality of life, it’s clear that the reasons are many and reflect individual needs and desires.


years of experience


windows installed


completed expansion projects


knowledge of the 19 boroughs of Montreal

What our clients say about us

Discover the testimonials of our customers who share their experience with RÉNO M3


You are considering enjoying many more years in your cozy home, but the need for space is becoming increasingly apparent. Expanding your home seems like the ideal solution. There are many methods to achieve this goal. Our construction and renovation experts will be your guides, helping you bring your ideas to life and offering solutions to address your lack of space.

Our team, composed of trained and experienced professionals in space design, excels at bringing your ideas to life. After gathering all the essential information to understand your needs and objectives, we will materialize your house extension concepts by visualizing them. The 2D and 3D designs will offer you a clear perspective on the direction your project will take. You will have the opportunity to refine it at any time before entering the construction phase.

Absolutely, all the projects featured on our website have been designed and executed 100% by our team at RÉNO M3. You can also browse through our portfolio of house expansions. Additionally, if you would like to visit an ongoing construction site or see a completed project, we would be happy to make arrangements to accommodate you.

What sets RÉNO M3 apart from other high-end house extension renovation contractors is our commitment to quality, attention to detail, and customer satisfaction. We pride ourselves on providing exceptional service and delivering projects that exceed our clients’ expectations. Our expertise, design sensibility, and technical competence enable us to create beautiful and functional interior spaces. Moreover, our experience in managing high-end projects allows us to meet deadlines and budgets while ensuring flawless execution.

We have a dedicated approach to sustainable construction in our house extension projects in Montreal. We prioritize the use of environmentally friendly materials, such as local and sustainable products, in order to reduce our carbon footprint. Additionally, we strive to optimize energy efficiency by installing high-efficiency heating and cooling appliances and systems. We also encourage our clients to choose sustainable solutions, such as installing double-glazed windows with low-emissivity (Low-E) coating and argon filling, which enhance thermal insulation. Similarly, we offer low-flow plumbing systems that help reduce water consumption. By incorporating these sustainable practices, we aim to promote a healthy environment and minimize the environmental impact of our house extension projects in Montreal.

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