London, Ontario Basement Cost Guide: 2026 Updated Prices
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you can use the
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It allows you to input your specific square footage and project requirements to get a personalized, instant estimate.
Finishing your basement is the smartest way to boost your home’s value here
in the Forest City.
But the big question is always:
“How much is this going to cost me?”
We’ve put together
this 2026 price guide based
on local market trends to give you the real numbers you need to plan your budget.
What’s Inside:
Costs Based on Your Vision
(Standard vs. Luxury)
City of London Permits:
When do you need them?
Surprise Costs:
Common hidden fees to watch for
The Western Renovations Deal
How Much Does it Actually Cost?
In London, Ontario, basement reno costs usually depend on how you plan to
use the space.
No two basements are the same, so instead of "fixed packages," we look at different scenarios. To give you an idea, these numbers are based on
an average 800 sqft basement:
Option A:
The Lifestyle Basement
(For Your Own Use)
This is all about making your home more comfortable. Maybe you need a spot for the kids to play or a quiet corner
to work from home.
The "Let’s keep it simple" Scenario:
Let’s say you just want a clean, bright space for a home office, a gym, or a playroom.
This covers the essentials: walls, ceiling, flooring, and standard lighting.
Estimated Cost: $45 - $55+ / sqft
Total Budget (800 sqft): $36,000 - $44,000
The "Dream Hangout" Scenario:
For example, you’re picturing a high-end home theatre, a custom bar for hosting friends, or a luxury guest bathroom. This includes soundproofing, built-in shelving,
and premium finishes.
Estimated Cost: $60 - $75+ / sqft
Total Budget (800 sqft): $48,000 - $60,000
Option B:
The Legal Rental Suite (Investment)
If you’re looking for a "mortgage helper," you’ll need to follow the City of London’s strict bylaws for secondary dwelling units. This means adding a kitchen, a separate entrance, and extra fire safety.
The Functional Rental:
Let’s say you want a durable, legal apartment for a student or a small family.
This includes a standard kitchen, bathroom, and all the required safety inspections.
Estimated Cost: $75 - $85+ / sqft
Total Budget (800 sqft): $60,000 - $68,000
The High-End Income Property:
For example, you’re aiming for top-tier rent or an Airbnb-style suite. Think open-concept layouts, quartz countertops, premium tiling, and top-notch sound
insulation between floors.
Estimated Cost: $90 - $110+ / sqft
Total Budget (800 sqft): $72,000 - $88,000+
Permits:
The "City of London" Factor
You don't always need a permit for cosmetic stuff like painting
or changing floors.
But if you’re moving walls or adding plumbing, you definitely do.
Permit & Architectural Fees:
Usually range between $1,500 and $2,000 depending on the project size.
Egress Windows:
If you’re adding a bedroom, a proper fire exit window is mandatory.
Adding one (including the permit)
usually costs between $1,000 and $3,000+.
Watch Out for These "Hidden Fees"
When comparing quotes, keep an eye on these common surprises that can pop up once the walls are opened:
Electrical Panel Upgrade:
Many older London homes
have 100 Amp service.
If you're adding a kitchen or an EV charger, you might need a
200 Amp upgrade.
Cost: $5,000+.
Separate Entrance:
Required for most legal suites to meet fire and safety codes. Adding a professional side or rear entrance typically costs between $7,000 and $15,000.
Mold or Moisture Issues:
If we find old leaks or mold behind your current insulation, it has to be fixed before we build. Cleanup can cost anywhere from
$1,500 to $5,000.
HVAC & Bulkheads:
Moving ductwork or boxing in low-hanging pipes (bulkheads) to get that "flat ceiling" look can add about $2,000 in extra labour.
The Western Renovations Deal
We’re constantly updating our offers to make sure our clients get the best value in town.
Our Current Deal:
When you book your basement renovation with Western Renovations, we’ll throw in free interior painting labour for your entire house.
It’s our way of making sure your whole home feels brand new.
Ready to take the first step?
The shortest way to find your answer
is to speak with an expert.
Contact us today for a free on-site consultation.
We’ll help you map out your project and provide a clear, professional path forward.
Terms and conditions apply. Financing is subject to credit approval.