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Professional Home Expansions & Additions in Montreal

Montreal homeowners trust Group KASA for home expansions and additions built to last. Structural work, permits, architecture coordination and custom finishes.

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OUR EXPERTISE

Complete Home Addition & Expansion Services in Montréal

Your home is your biggest investment. When your family grows or your needs change, expanding your space is the smartest way to add value without moving. You need a contractor who manages every detail from the foundation up.

Structural work, architecture coordination, permits, framing, insulation and custom finishes — every trade coordinated, every decision made with you.

At Group KASA, we manage every aspect of your home addition. Demo, structural work, exterior envelope, interior finishes and final delivery. No juggling multiple trades. No costly surprises. Just one team accountable for the entire job from day one.

We are your single point of contact for home expansions and additions across Montreal — whether it’s a rear addition, a second floor or a full reconfiguration of your existing footprint

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Home extension & addition

EXPAND YOUR HOME. ADD SPACE. BUILD VALUE.

Home additions and expansions encompass a variety of services designed to enhance residential living spaces.
 
These projects can range from simple bump-outs to extensive second-story additions, each tailored to meet the unique needs of homeowners.
 
The benefits of home expansions include increased living space, improved property value, and enhanced comfort.

Second-Story Additions

Second-story additions are a popular choice for homeowners looking to maximize their existing footprint while adding significant living space.
 
This type of expansion allows for the creation of additional bedrooms, bathrooms, or even dedicated office spaces.
 
The benefits include not only increased square footage but also the potential for better views and improved natural light. Additionally, a well-executed second-story addition can significantly enhance the overall aesthetic appeal of a home.
 
 
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Rear Extensions & Bump-Outs

Rear extensions and bump-outs are effective ways to increase living space without altering the home’s overall footprint.
 
These additions can create larger kitchens, dining areas, or family rooms, making them ideal for families that require more space for daily activities.
 
The design options for rear extensions are diverse, allowing homeowners to choose styles that complement their existing architecture while maximizing natural light and enhancing outdoor views.
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Sunrooms & Four-Season Additions

Sunrooms and four-season additions provide homeowners with versatile spaces that can be enjoyed year-round.
 
These additions are designed to bring the outdoors in, offering a bright and airy environment perfect for relaxation or entertaining.
 
The benefits of sunrooms include increased natural light, improved energy efficiency, and a seamless connection to outdoor spaces, making them a valuable addition to any home.
 
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Garage Conversions & Accessory Dwelling Units

Converting a garage into a livable space or creating an accessory dwelling unit (ADU) is an excellent way to add value to a property.
 
These conversions can serve various purposes, such as guest suites, rental units, or home offices.
 
The advantages include generating rental income, increasing property value, and providing flexible living arrangements for family members or guests.
 
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Foundation Underpinning & Structural Reinforcement

Foundation underpinning and structural reinforcement are critical components of any home expansion project.

Ensuring the structural integrity of a home is paramount, especially when adding significant weight or altering the existing layout.

This process involves strengthening the foundation to support new additions, ensuring compliance with building codes, and providing long-term stability for the home.

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Home extension & addition

The Groupe Kasa 5-Step Home Addition Process

Group Kasa follows a structured five-step process to ensure that every home addition project is executed smoothly and efficiently. This approach emphasizes client involvement and quality assurance throughout the project..
The first step involves conducting a feasibility study to assess the viability of the proposed addition. This includes reviewing local zoning regulations and understanding permit requirements.
 
Engaging clients in this process ensures that their vision aligns with practical considerations.
  • Current lot and structure assessment
  • Zoning and setback requirements review
  • Permit requirements and city submission process
  • Budget alignment and project scope
  • Timeline expectations
Once feasibility is established, the next step focuses on architectural design and engineering. This phase emphasizes collaboration with clients to create custom design solutions that meet their needs while adhering to local building codes and regulations.
 
  • Architectural plans and drawings
  • Structural engineering review
  • Material and exterior finish selection
  • Window and door placement planning
  • Final design and plan approval
Foundation and structural work is critical to the success of any addition. This step ensures that the existing structure can support the new weight and that all work complies with safety standards. Proper execution at this stage is essential for long-term stability.
  • Excavation and foundation work
  • Structural framing and beam installation
  • Exterior envelope and weatherproofing
  • Plumbing and electrical rough in
  • City inspections at structural milestones

With the structure complete, we move to interior finishing and systems integration. Insulation, drywall, flooring, electrical, plumbing and all interior finishes are installed and coordinated by our team so the new space feels like it has always been part of your home.

 
  • Insulation and drywall installation
  • Flooring and tile work
  • Electrical and lighting installation
  • Plumbing and fixture installation
  • Heating and ventilation integration
  • Paint and finishing touches

When the addition is complete, we walk through every detail with you. Every room, every finish, every system reviewed together. If anything needs attention, we take care of it before we call the project complete. Your satisfaction is what closes the job.

  • Full walkthrough with the Group KASA team
  • Punch list review and final adjustments
  • Warranty and guarantee documentation
  • Care and maintenance recommendations
  • Project officially handed over to you
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THE GROUP KASA DIFFERENCE

Why Montreal businesses choose Group KASA

Choosing a licensed RBQ contractor is essential for ensuring a successful bathroom renovation. Licensed contractors adhere to strict regulations and standards, providing peace of mind for homeowners.

RBQ Licensed and Fully Insured

This certification ensures that the contractor is knowledgeable about building codes and regulations, which is crucial for a safe and compliant renovation.

Structural Engineering & CCQ-Certified Trades

Working with CCQ-certified trades ensures that all aspects of the construction process meet safety and quality standards.

Family-Driven Craftsmanship

Our founders spent their lives in construction. We grew up on job sites. That hands-on background means we understand your project at every level, from the structural decisions to the finishing details.

Multilingual Service

To accommodate the diverse population of Montreal, Group Kasa offers multilingual services in English, French, and Spanish.

Home extension & addition

Home Addition Costs in Montréal — What to Expect

Understanding the costs associated with home additions is crucial for effective budgeting and planning. Various factors can influence the overall expense of a project.
 

The type of addition you choose has the biggest impact on your budget. A rear extension requires excavation and a new foundation. A second story addition builds on your existing footprint but requires significant structural reinforcement.
  • Rear extension with new foundation
  • Second story addition
  • Garage conversion to living space
  • Lateral bump out addition
  • Basement finishing and conversion
The materials you choose for the exterior envelope, roofing, windows, flooring and interior finishes all significantly influence the final cost of your project.
  • Exterior cladding and roofing material
  • Window and door selection
  • Flooring type and material
  • Interior finishes and millwork
  • Insulation and soundproofing grade

Labor costs depend on the complexity and size of the addition. Structural work, foundation and mechanical systems are the biggest labor drivers. All trades are coordinated by Group KASA so there are no surprises on the labor side.
  • Excavation and foundation work
  • Structural framing and engineering
  • Plumbing and electrical rough in
  • Mechanical and HVAC systems
  • Finishing and cleanup
The more complex the layout change, the higher the cost. Moving plumbing walls, adding a double vanity, converting a tub to a walk in shower or reconfiguring the floor plan all add to the scope.
  • Open concept layout and structural beams
  • Vaulted or cathedral ceilings
  • Custom built in storage and millwork
  • Heated floor systems
  • Smart home and technology integration
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OUR SERVICE AREAS

Serving Montreal's Distinct Neighbourhoods

Montreal is home to diverse neighborhoods, each with its unique character and style. Group Kasa is proud to offer tailored bathroom remodeling services that cater to the specific needs of homeowners in Westmount, Outremont, Verdun, and Lachine.

West Island

  • Dollard-des-Ormeaux
  • Pierrefonds
  • Kirkland
  • Beaconsfield
  • Dorval
  • Pointe-Claire
  • Île-Bizard
  • Île-Perrot

Montreal

  • Rosemont
  • Griffintown
  • Plateau Mont-Royal
  • Saint-Laurent
  • Westmount
  • Montréal Est
  • Pointe-aux-Trembles
  • Ahuntsic
  • Anjou
  • Outremont

South Shore

  • Brossard
  • Longueuil
  • Saint-Hubert
  • Boucherville
  • Saint-Lambert
  • Greenfield Park

Home extension & addition

Navigating Montréal Zoning Bylaws & Building Permits

Understanding local zoning bylaws and building permits is essential for any homeowner considering a home addition. Compliance with these regulations ensures that projects proceed smoothly and avoid potential legal issues.
 
 
Montreal zoning bylaws regulate how much of your lot can be built on, how high you can build and how close to property lines your addition can come. Every borough has its own rules. Group KASA reviews your specific zoning constraints before any design work begins.
  • Maximum lot coverage rules
  • Setback requirements from property lines
  • Maximum building height restrictions
  • Front and rear yard requirements
  • Borough specific regulations
Building permit timelines in Montreal vary by borough and project complexity. Simple additions can be approved in 4 to 8 weeks.
 
More complex projects involving structural changes or heritage considerations can take longer. Group KASA submits complete, accurate permit applications to avoid back and forth with the city.
  • Permit application preparation and submission
  • City review and approval timeline
  • Required documents and plans
  • Inspection scheduling at key milestones
  • Certificate of occupancy upon completion
If your property is located in a heritage overlay zone, additional approvals may be required before work can begin. Group KASA works with specialized partners experienced in heritage renovation to ensure full compliance while preserving the character of your home.
  • Heritage designation review
  • CCUHC or borough heritage committee approval
  • Exterior material and design compliance
  • Specialized heritage contractor coordination
  • Documentation and approval management
Group KASA handles every aspect of the permit and zoning process on your behalf. From the initial feasibility review to final city approval, we make sure your project is compliant, properly permitted and ready to build.
  • Zoning and feasibility review before design
  • Full permit application preparation
  • Coordination with architects and engineers
  • City submission and follow up
  • Inspection scheduling and sign off
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Our Work

OUR HOME ADDITION & EXPANSION PROJECTS IN MONTREAL

Every home addition we deliver is the result of careful planning, skilled trades and close collaboration with the homeowner. Browse a selection of our completed home expansions and additions across Montreal, Westmount, Outremont and beyond.

OUR SERVICES

Every residential renovation service you need, under one roof

No more coordinating multiple contractors. Group KASA steps in as your licensed general contractor and manages every trade, every permit and every deadline from start to finish.

 

Turnkey Renovation

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Kitchen Remodeling

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Home Expansion

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Frequently Asked Questions About Montreal Bathroom Renovations

EVERYTHING YOU NEED TO KNOW ABOUT OUR SERVICES.

The timeline for completing a home addition in Montréal can vary based on the project‘s complexity and scope. Generally, homeowners can expect the process to take anywhere from 8 to 12 weeks, including design, permitting, and construction phases.
 
Yes, a permit is typically required for home additions in Montréal. Homeowners must submit plans and obtain approval from local authorities to ensure compliance with zoning bylaws and building codes.
Yes, adding a second story to homes in Westmount or Outremont is possible, but it requires careful planning and adherence to local regulations. Homeowners should consult with professionals to ensure that their designs comply with heritage considerations and zoning laws.
Yes, Group Kasa provides multilingual services in English, French, and Spanish, ensuring effective communication with all clients.
Structural work for a rear extension often includes foundation reinforcement, framing, and ensuring that the new addition integrates seamlessly with the existing structure. Engaging a licensed contractor is essential for ensuring that all work meets safety and quality standards.

READY TO EXPAND YOUR HOME?

Contact Group KASA today to request your free home addition evaluation.

Our team is here to help you plan and build the addition your family needs, tailored to your home and your budget.

REQUEST YOUR FREE HOME ADDITION EVALUATION