Montreal is a fascinating anomaly in the Canadian renovation market: a world-class city with renovation costs that are, in some categories, below the national average, and in others, sharply above it. The city's enormous stock of pre-war housing — the famous plex (duplex/triplex) built between 1890 and 1950 — creates both opportunity and complexity for anyone renovating in the city. This guide explains the Montreal market in plain English, including the Quebec-specific rules that trip up homeowners from other provinces.
Why Montreal's Costs Are Different
Montreal's labour market is the primary reason costs track below Toronto and Vancouver. The construction and renovation industry has historically been less tight in Quebec, partly because the province's lower population growth reduces overall demand pressure. However, several factors push specific costs higher:
Specialized heritage skills: Montreal's plex stock requires trades who understand traditional construction: lime mortar repointing (not Portland cement, which damages historic brick), original hardwood refinishing, the repair of Montreal's distinctive exterior staircases (iron and wood). These skills command premium rates ($80–$130/hr for experienced plex specialists).
RBQ licensing complexity: Quebec's Régie du bâtiment du Québec (RBQ) is the most rigorous contractor licensing system in Canada. Licensed contractors must carry specific insurance categories and renew their credentials regularly. The RBQ system protects homeowners — but it also limits who can legally do renovation work, which affects competition and pricing in certain trades.
Union labour influence: Quebec's construction industry is significantly more unionized than other provinces. Union-affiliated trades on larger projects bill at collectively bargained rates that are higher than non-union equivalents, particularly for commercial and multi-residential work. Residential renovation is more mixed — many skilled trades operate as independents — but union norms influence the overall rate structure.
The Quebec Regulatory Framework
Any homeowner renovating in Quebec needs to understand the RBQ system:
- RBQ licence requirement: Any contractor performing renovation work over $1,000 in Quebec must hold an RBQ licence. You can verify a contractor's licence at rbq.gouv.qc.ca. An unlicensed contractor provides no warranty protection and, if injured on your property, may expose you to significant liability.
- Legal warranty (garantie légale): Quebec's Civil Code provides a mandatory 1-year warranty for visible defects, 3-year warranty for hidden defects, and 5-year warranty for structural defects. These warranties apply regardless of what your contract says, but only for work done by RBQ-licensed contractors.
- Owner-built exception: Like most provinces, Quebec allows homeowners to perform work on their own principal residence without an RBQ licence. However, you must demonstrate you personally performed the work, and the legal warranty doesn't apply for resale purposes.
- Tax credits: Quebec's LogiRénov tax credit (residential renovation tax credit) provides up to $10,000 in refundable credits for eligible renovation work — one of the most generous provincial programs in Canada. Check revenuquebec.ca for current eligibility and claiming instructions.
The Montreal Permit Process
Montreal is divided into 19 boroughs (arrondissements), and each borough processes its own building permits. Timelines and requirements vary:
- Plateau-Mont-Royal: The strictest borough for renovation approvals, given the density of heritage-designated buildings. Permit review for exterior changes to a plex in the Plateau can take 8–16 weeks and requires architectural drawings.
- Rosemont–La Petite-Patrie, Villeray–Saint-Michel–Parc-Extension: More moderate timelines, 6–12 weeks for exterior permits. Strong community interest in plex character maintenance means heritage requirements are taken seriously even for non-designated properties.
- Côte-des-Neiges–Notre-Dame-de-Grâce: Good borough for straightforward permits; 4–8 weeks for typical residential work.
- Laval and South Shore suburbs: If you're in Laval, Longueuil, Brossard, or other off-island municipalities, permitting is faster (3–7 weeks) and requirements are generally less complex than in urban Montreal proper.
One Montreal-specific consideration: the city's subdivision cadastre system (renovation permits often touch on cadastral boundaries) can create unexpected steps for projects on lots with unclear boundaries. In older Montreal neighbourhoods, many lots were subdivided in the early 1900s with informal descriptions that don't match modern cadastre records. Budget extra time (4–8 weeks) and notary fees ($1,000–$3,000) if your project requires any formal lot-line clarification.
The Plex: Montreal's Unique Renovation Challenge
Perhaps 60–70% of Montreal's inner-city housing stock is plex — the distinctive 2- and 3-storey brick and stone buildings with exterior staircases that define neighbourhoods like the Plateau, Rosemont, Villeray, Verdun, and NDG. Renovating a plex has specific characteristics:
Multi-tenancy complexity: If you own a plex with tenants, Quebec's residential tenancy law (administered by the Tribunal administratif du logement, or TAL) governs what work requires tenant notice, what constitutes a major disturbance, and under what circumstances costs can be recouped through rent increases. Major renovations that require temporary tenant relocation require formal TAL approval and can take 3–6 months to process. Do not start plex renovation without consulting a TAL-experienced lawyer or notary ($500–$2,000 for initial consultation).
Exterior staircases: Montreal's iconic exterior staircases are expensive to maintain. Wooden staircases need full replacement every 15–25 years ($8,000–$20,000 per staircase depending on size and material). Iron staircases last longer but require painting every 5–8 years ($1,500–$4,000). Some boroughs restrict material changes to exterior staircases on heritage streetscapes.
Brick repointing: The brick facades of pre-war Montreal plexes require repointing approximately every 30–50 years. The critical rule: use lime-based mortar (not Portland cement). Portland cement is harder than the historic brick and causes brick face spalling that can destroy an entire facade. Properly matched lime mortar repointing costs $25–$45/sq ft for the facade and should only be entrusted to masons experienced with historic masonry.
Electrical service upgrades: Many pre-1970 Montreal plexes have 60-amp electrical service — completely inadequate for modern appliances and EV charging. Upgrading to 200-amp service costs $3,000–$7,000 per unit. Hydro-Québec requires a service upgrade application that can take 4–12 weeks depending on transformer capacity in your area.
Cost Benchmarks: Montreal 2026
- Kitchen renovation (mid-range): $28,000–$58,000
- Bathroom renovation (full gut): $12,000–$26,000
- Plex unit full renovation: $55,000–$130,000
- Exterior staircase replacement (wood): $8,000–$20,000
- Brick facade repointing (per storey, 30 lf): $4,000–$9,000
- Electrical upgrade (60A to 200A, per unit): $3,000–$7,000
- Roof replacement (flat, torch-on, 1,500 sq ft): $10,000–$20,000
- Windows (8–10 units): $10,000–$22,000
Finding Good Contractors in Montreal
Always verify RBQ licence status before hiring any contractor in Quebec. Legitimate contractors display their RBQ licence number on all quotes and invoices. Also request proof of professional liability insurance and, for plex work, confirmation that they have experience with multi-tenant buildings and TAL procedures.
The APCHQ (Association des professionnels de la construction et de l'habitation du Québec) maintains a member directory of qualified renovation contractors. APCHQ members are required to meet minimum insurance and licensing standards, providing an additional layer of vetting beyond the basic RBQ check.
Language note: The Montreal renovation market operates primarily in French. English-speaking homeowners in Westmount, NDG, or other anglophone areas can usually find bilingual contractors, but the best specialists — particularly for plex and heritage work — may communicate primarily in French. Be prepared to work with Google Translate on quotes and contracts, or budget $500–$1,500 for a bilingual contractor liaison if needed.