Home additions
More Room in the Home You Already Love.
Home Renovation Contractors builds home additions and extensions across Greater Montreal, Laval, Longueuil and the North and South Shores.
An addition starts with zoning: setbacks, building height and lot coverage decide what can be built. Plans by an architect or technologist, and structural design by an engineer when needed, come before the permit.
In Montreal, permit review fees are $9.80 per $1,000 of work, with a $167.40 minimum for residential buildings. Additions take longer to approve than interior renovations, so plan early.
Additions are often combined with kitchen renovation, windows and doors and roofing.
Is an addition right for you?
Signs It Is Time to Add Space.
An addition makes sense when rearranging existing rooms is no longer enough.
The family is growing
Bedrooms or a playroom you cannot carve out inside.
Working from home
A real office instead of the kitchen table.
A cramped kitchen
No room for an island or table.
Multigenerational living
Space for a parent or adult child.
You love the location
Moving would cost more than building.
Unused yard space
Room to extend at the back or side.
What we build
Home Addition Services.
From feasibility to finishes, coordinated by one team.
Planning and permits
Feasibility, coordination with your designer or engineer, and permit applications.
✓ Clear plans before work.
Structure and envelope
Foundations, framing, roof, windows, insulation and tie-in with the existing house.
✓ Weather-tight and built to code.
Interior finishing
Electrical, plumbing, drywall, flooring and millwork matched to the existing home.
✓ Looks like it was always there.
Options compared
Types of Home Additions.
Each type has different structural and permit requirements.
| Addition | Good for | Consider |
|---|---|---|
| Rear extension | Kitchens and family rooms | Yard space and setbacks |
| Second storey | Bedrooms on the same footprint | Existing structure and foundation |
| Sunroom | A bright, garden-facing room | Heated or three-season |
| Bump-out | Small gains in kitchens or baths | Cantilever or small foundation |
Zoning rules decide what can be built on your lot; we check them first.
Step by step
How a Home Addition Unfolds.
Planning and permits often take as long as the construction.
Visit and feasibility
Your needs, lot and zoning reviewed together.
Plans and permits
Plans prepared with your designer or engineer; permits applied for.
Foundation
Excavation and foundation for the new space.
Framing and roof
Structure, roof and tie-in with the existing house.
Envelope and systems
Windows, insulation, electrical, plumbing and heating.
Interior finishes
Drywall, flooring, millwork and paint.
Walkthrough
Final inspection and walkthrough together.
Before you compare quotes
What Drives the Cost of an Addition.
Additions are priced after plans exist, because structure and site conditions drive cost.
Size and storeys
Square footage and whether you build up or out.
Foundation
Full basement costs more than a slab or crawl space.
Site access
Tight Montreal lots and lanes affect equipment and delivery.
Kitchens and baths
Plumbing-heavy rooms cost more per sq. ft.
Professional fees
Plans, engineering and permits.
Finishes
Windows, flooring and millwork choices.
Do I need a permit for a home addition in Montreal?
Yes. Additions always require a permit, and plans are usually required. Zoning rules such as setbacks and height limits apply.
How long does a home addition take?
Planning and permits can take several months; construction typically takes a few months depending on size.
Can my house support a second storey?
It depends on the existing foundation and structure, which an engineer assesses before design.
Will the addition match my existing home?
We plan materials, rooflines and finishes so the new space blends with the existing house.
Can we live in the house during the work?
Usually yes; most work happens outside until the tie-in, which we schedule to limit disruption.
Who prepares the plans?
An architect, technologist or engineer, depending on the project. We coordinate with them or recommend professionals.
Get started
Planning a Home Addition?
Tell us what space you need, your lot and your timeline. We will review feasibility and come back with next steps.
- What you want to add
- Photos of the house and yard
- Any plans or sketches you have
Serving all seven areas of Greater Montreal · all renovation services · renovation FAQ
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Replies with clarifying questions — not a robocall.