Montreal, QC · Q3 2026
Central AC renovation cost in Montreal
Condenser, coil, line set, and the electrical it needs. The figures below are modelled for Montreal, QC using our 0.98× regional cost multiplier, on a detached home built 1960-1989 at a mid-range finish.
Typical planning budget
$4,500 to $7,200
Typical $5,450 · includes 12% contingency
Why Montreal differs
Montreal prices about 2% below Ottawa, which is the baseline our regional model is anchored to.
- Regional multiplier
- 0.98×
- Versus Ottawa
- -2%
- Province
- Quebec
- Sales tax on services
- GST + QST (14.975%)
Regional multipliers are anchored to Ottawa at 1.00 and scaled using Statistics Canada's Residential Renovation Price Index and Building Construction Price Index movements by census metropolitan area, then cross-checked against published contractor rate ranges. They are planning-level adjustments, not surveyed local quotes.
Areas this covers
Montreal, QC is modelled as a single labour market, so these municipalities share the same cost multiplier:
- Montréal
- Laval
- Longueuil
- Brossard
Somewhere else in Quebec? Compare every Quebec region.
Cost by finish level in Montreal
Finish level moves the number more than almost anything else you control. All three rows use the same Montreal multiplier and the same scope.
| Finish | Low | Typical | High |
|---|---|---|---|
| BudgetStock materials, simple details, value fixtures | $3,200 | $3,900 | $5,150 |
| Mid-rangeCommon homeowner choice: durable materials, better fixtures | $4,500 | $5,450 | $7,200 |
| PremiumHigh-end materials, custom detailing, designer fixtures | $6,600 | $8,000 | $10,700 |
Cost by size in Montreal
Typical all-in planning budgets at three representative sizes, mid-range finish.
| Size | Low | Typical | High |
|---|---|---|---|
| 1,100 sq ft | $4,050 | $4,850 | $6,550 |
| 1,800 sq ft | $4,500 | $5,450 | $7,200 |
| 3,000 sq ft | $5,200 | $6,350 | $8,400 |
Where the money goes
The $5,450 typical figure for Montreal, broken into the lines a contractor quote should also separate.
| Category | Low | Typical | High |
|---|---|---|---|
| Materials | $2,150 | $2,600 | $3,450 |
| Labour | $1,550 | $1,850 | $2,500 |
| Demolition and disposal | $150 | $200 | $250 |
| Permit and design allowance | $150 | $200 | $250 |
| Subtotal | $4,000 | $4,850 | $6,450 |
| Contingency (12%) | $500 | $600 | $750 |
| Total planning budget | $4,500 | $5,450 | $7,200 |
Compared with the rest of Quebec
Same project, same scope and finish, priced against every other Quebec region we model.
| Region | Multiplier | Typical | vs Montreal |
|---|---|---|---|
| Montreal (this page) | 0.98× | $5,450 | — |
| Quebec City | 0.93× | $5,050 | -7% |
| Other Quebec | 0.91× | $4,950 | -9% |
Permits in Quebec
Renovation permits are issued by your municipality or borough. Quebec also applies the Construction Code province-wide.
Commonly triggered by this project
- HVAC changes. Adding or relocating heating, cooling, or ventilation may require a permit and load calculations.
Hiring in Quebec
Quebec is the strictest province: every construction and renovation contractor must hold a valid Régie du bâtiment du Québec (RBQ) licence. Hiring an unlicensed contractor is illegal.
Trades that must be certified
- Electrical: Electrical work must be done by an RBQ-licensed electrical contractor, normally a CMEQ member.
- Plumbing and heating: Plumbing and heating work must be done by an RBQ-licensed contractor, normally a CMMTQ member.
Costs people forget on this project
Included as allowances above. Check any quote covers them too.
- Dedicated circuit, disconnect, or a full panel upgrade
- New line set when the old one cannot be reused
- Indoor coil replacement, which is usually necessary on a system change
- Condensate drainage and overflow protection
- Ductwork that cannot carry the required airflow
- Condenser pad, brackets, or sound screening required by a bylaw
Typical schedule: 1 day, or 2 to 3 days with electrical work.
Questions homeowners ask
- Why do I need a new indoor coil for an outdoor unit?
- The coil and condenser are a matched pair. Modern refrigerants and efficiency ratings assume a matched set, and installing a new condenser on an old coil usually voids the equipment warranty and gives you neither the efficiency nor the capacity you paid for. It is included by default above for that reason.
- Will my electrical panel handle it?
- Often, but not always, and it is the single most common surprise on an air conditioning quote. A 100-amp panel in an older home with electric appliances may already be near capacity. Any installer should check the available load before quoting; if yours did not, ask.
- Is a heat pump worth the extra cost?
- A cold-climate heat pump costs more up front than an air conditioner but also heats, so it displaces gas or oil for most of the season. It also attracts the largest rebates available to Canadian homeowners. Select it above to see the difference against a plain air conditioner, then check the rebates page, because nearly every programme requires applying before the work starts.
- How much does size matter?
- More than most people expect, and bigger is not better. An oversized unit short-cycles, which cools the air without removing humidity and leaves a room clammy. Sizing should come from a heat-gain calculation on your home, not from the square footage alone.