Basement Finishing & Legal Rental Suites
Western Renovations transforms unfinished basements into luxury living spaces, home theaters, and income-generating legal secondary suites. Navigating the 2024 Ontario Building Code (OBC), understanding true renovation costs, and securing the right financing requires absolute precision. From ensuring code-compliant egress windows to executing our stress-free 5-step construction process, our 100% in-house team handles everything. We deliver fully compliant, stunning basements with zero hidden fees.
Financing: 0% Interest Plans & Flexible Financing Available for projects up to $100,000.
Please note: These figures are estimated baseline ranges to help you plan. Final investments will vary and may exceed these maximums based heavily on the specific materials you choose. Additional factors like larger square footage, structural layout changes, or required mechanical and code upgrades will also affect the final cost. We will provide your exact, down-to-the-penny fixed cost after our free on-site assessment. On approved credit. Based on 0% APR financing. Subject to credit approval.
- Section 1: Where Do I Start? Our 5-Step Basement Renovation Process
- Section 2: Real Costs & Flexible Financing Options (800 sq.ft. Guide)
- Section 3: Navigating OBC 2024: Egress Windows & Permits
- Section 4: Avoiding Common Hidden Fees and Surprise Costs
- Section 5: Fire Safety, Moisture Control & In-House Mechanicals
- Section 6: Frequently Asked Questions (FAQ)
2026 Basement Cost Calculator
Our 5-Step Basement Renovation Process
Initial Consultation
Your journey begins with a free, face-to-face home assessment. We listen to your goals, evaluate the space, and discuss our affordable payment plans to ensure the project fits your budget.
Custom Design
We create custom design drawings so you can visualize the transformation before construction begins. Whether it is a home cinema, gym, or rental unit, the layout is perfectly tailored to your lifestyle.
Permit Management
We handle the heavy lifting. We manage the entire structural permit process with the City of London or surrounding municipalities, prioritizing fire safety, egress windows, and legal compliance.
Infrastructure
Reliability starts behind the walls. We use our own licensed plumbing and electrical specialists. Every rough-in is executed with precision to meet the Ontario Building Code (OBC).
Professional Finishing
After precision drywall, premium flooring, and painting, we conclude with a thorough post-construction cleaning. We remove all dust and debris, leaving your new basement spotless and move-in ready.
Real Costs & Flexible Financing Options
In London, Ontario, basement renovation costs depend entirely on how you plan to use the space. To help you make informed decisions, here is what you can expect for a typical 800 sq.ft. basement based on our 2026 market data:
The Lifestyle Basement
A clean, bright space for a home office, gym, or playroom. Covers walls, ceiling, flooring, and standard lighting.
The Dream Hangout
High-end home theatre, custom bar, or a luxury guest bathroom. Includes soundproofing and premium finishes.
The Legal Rental Suite
An income-generating unit requiring strict city bylaws, a full kitchen, a separate entrance, and extra fire safety separations.
Avoiding Common Hidden Fees
When comparing quotes from other contractors, keep an eye on these common surprises that can pop up once the walls are opened. Our strict "No Hidden Costs" philosophy means we identify these risks during our initial assessment:
Electrical Panel Upgrades
Many older London homes have 100 Amp service. If you are adding a suite kitchen or an EV charger, upgrading to 200 Amps is heavily required to safely handle the new load.
$5,000+
Separate Entrances
Required for most legal suites to meet strict fire and safety codes. This involves heavy concrete cutting, excavation, and professional door installations.
$7,000 - $15,000
Mold or Moisture Issues
If we find old leaks or mold behind your current insulation during the initial teardown, it has to be professionally fixed and waterproofed before we build.
$1,500 - $5,000
Avoiding Common Hidden Fees
When comparing quotes from other contractors, keep an eye on these common surprises that can pop up once the walls are opened. Our strict "No Hidden Costs" philosophy means we identify these risks during our initial assessment:
Electrical Panel Upgrades
Many older London homes have 100 Amp service. If you are adding a suite kitchen or an EV charger, upgrading to 200 Amps is heavily required to safely handle the new load.
$5,000+
Separate Entrances
Required for most legal suites to meet strict fire and safety codes. This involves heavy concrete cutting, excavation, and professional door installations.
$7,000 - $15,000
Mold or Moisture Issues
If we find old leaks or mold behind your current insulation during the initial teardown, it has to be professionally fixed and waterproofed before we build.
$1,500 - $5,000
Fire Safety, Moisture Control & Mechanicals
Strict Fire Safety
For legal suites, we construct continuous 30-to-45-minute fire-resistance-rated separations between units using Type X drywall. We also install mandatory interconnected smoke and carbon monoxide alarms, utilizing code-approved wireless technology.
Moisture Control
Basements naturally face hydrogeological pressure. We install professional-grade vapor barriers and continuous full-height insulation to meet the updated 18°C OBC basement design temperature. Where necessary, sump pumps and backwater valves are included.
In-House Mechanicals
We do not cause delays by waiting for third-party subcontractors. Our internal licensed plumbing and electrical specialists handle the framing, electrical, and plumbing rough-ins in perfect harmony.
Frequently Asked Questions
Contact Our Team
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Our Work
Updated: May 2026