Permit Guides › Ontario › London
📍 London, Ontario

Building Permit Guide
London

Everything you need to know about getting a building permit in London — official contacts, fees, timelines, and requirements by renovation type.

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Permit Requirements by Renovation Type

Kitchen Renovation
Permit required if moving or adding plumbing (sink, dishwasher lines)
Usually Required
Fee: $150–$500 · 2–6 weeks
Bathroom Renovation
Plumbing permit required for new or relocated fixtures
Usually Required
Fee: $150–$450 · 2–5 weeks
Basement Finishing
Building permit required to finish an unfinished basement
Always Required
Fee: $200–$800 · 3–8 weeks
Home Addition
Building permit always required for any addition
Always Required
Fee: $500–$3000 · 6–16 weeks
Roof Replacement
Permit required in most Ontario and BC municipalities
Usually Required
Fee: $100–$400 · 1–3 weeks
Deck / Patio Construction
Permit required for attached decks
Usually Required
Fee: $100–$350 · 2–5 weeks
Landscaping
Generally no permit required for landscaping
Rarely Required
Fee: Up to $200 · 1–2 weeks
New Home Construction
Full building permit always required
Always Required
Fee: $2000–$15000 · 8–20 weeks
Flooring Installation
No permit required for most flooring replacements
Rarely Required
Fee: Up to $100 · Same day–1 week
Windows & Doors
Permit required if enlarging or creating a new window or door opening
Sometimes
Fee: $75–$250 · 1–3 weeks
Electrical Upgrades
Electrical permit required for all new wiring, panels, and circuit work
Always Required
Fee: $100–$500 · 1–4 weeks
HVAC / Mechanical
Mechanical permit required for new HVAC systems
Always Required
Fee: $100–$400 · 1–3 weeks
Solar Panel Installation
Building permit for roof mounting and structural loads
Always Required
Fee: $150–$600 · 2–6 weeks
Garage / Carport
Building permit required for all new garages and carports
Always Required
Fee: $200–$800 · 3–8 weeks
Official Permit Office
Building Controls
Phone
Address
Typical Processing Time
3–10 weeks
Online Portal
✅ Available online
Visit Official Permit Office ↗
📊 Also useful for London
Kitchen renovation costs in London Bathroom renovation costs Basement finishing costs Find contractors in London
🧮 Free Calculators — London
🍳 Kitchen renovation cost estimate 🚿 Bathroom renovation cost estimate 🏚 Basement renovation cost estimate 🏗 Home addition cost estimate
All 16 London Calculators →

Frequently Asked Questions — London Building Permits

Do I need a permit for a kitchen renovation in London?
In London, a permit is required if your kitchen renovation involves moving plumbing, adding electrical circuits, or removing walls. Cosmetic upgrades like new cabinets, countertops, and backsplash typically do not require a permit.
How long does a building permit take in London?
Permit processing in London typically takes 3–10 weeks. More complex projects such as additions or structural work take longer. Applying online (if available) can speed up the process.
What happens if I renovate without a permit in London?
Renovating without a required permit in London can result in fines, orders to remove the work, difficulty selling your home, and insurance complications. Always check permit requirements before starting.
Can I apply for a permit online in London?
Yes — London offers online permit applications at https://london.ca. This is generally faster than in-person applications.