Before & After: Durham Basement Transformation Case Study (600 sq ft Legal Suite)
Before and after basement renovation in Whitby Ontario 600 sq ft legal suite by Urban RenoProjects | Urban Renoprojects
A 600 sq ft unfinished basement in Whitby, Ontario - raw concrete walls, exposed joists, no bathroom, no kitchen, no separate entrance. Twelve weeks later: a fully permitted, OBC-compliant legal basement suite generating $1,750/month in rental income. This is how a licensed basement renovation contractor in Durham turned dead space into an income-generating asset.
The Homeowner's Situation
The homeowners - a couple in their early 40s in Whitby - had lived in their home for eight years. The basement had always been "the plan." Store things now, finish it later. Later kept getting pushed. They began researching options using a legal basement suite guide to understand the full process, costs, and compliance requirements.
When their mortgage came up for renewal in late 2025, they ran the numbers. A legal basement apartment generating 1,700 - 1,800 per month would offset the new payment almost entirely. That changed "someday" into "now."
They searched for the best basement renovation company in Durham - one that handled permits, worked with licensed trades, and gave them a fixed price before starting. They contacted three contractors. Two gave verbal estimates that couldn't be committed to writing. The third was Urban RenoProjects.
They signed within two weeks of their first site visit.
The Before: What We Started With
The space:
600 sq ft of raw, unfinished basement
Raw concrete walls and floor throughout
Exposed joists - 7'8" floor-to-ceiling clearance (above the 1.95m OBC minimum)
One existing bathroom rough-in (capped drain in the floor - this saved significant cost)
No kitchen rough-in
No separate entrance
100-amp electrical panel - adequate for the suite addition with proper circuit planning
No evidence of moisture issues on walls or floor
Unfinished basement before renovation in Whitby Durham Region raw concrete and exposed joists | Urban Renoprojects
What this told us as a licensed basement contractor in Durham:
Ceiling height was workable without underpinning - a significant cost saving
The existing bathroom rough-in meant no concrete cutting for the bathroom drain - another saving
The kitchen would require a new drain line - one area of concrete cutting required
A side entrance to the home was structurally achievable - a door opening could be created through the existing foundation wall at the side of the house
This is the kind of assessment that separates an experienced basement renovation contractor in Durham from one who just shows up and starts quoting. Understanding what already exists - and what it saves - is what made the fixed-price quote accurate.
The Goals: What the Homeowner Wanted
The homeowners were clear from the first meeting:
A fully legal, registered secondary suite - not a grey-area rental, not an unpermitted unit
A separate entrance so the tenant had full privacy
A 1-bedroom suite with a full kitchen and bathroom
Fixed-price contract - no surprises after signing
All permits managed by the best basement renovation company in Durham they could find - they didn't want to deal with the building department themselves
Done in time to advertise for a January tenant
Urban RenoProjects delivered all five.
The Plan: How Urban RenoProjects Approached It
After the site assessment, our team produced:
Full architectural drawings for the Town of Whitby building permit application
Electrical layout for the ESA permit application
A detailed scope covering every trade, every material, every cost - in writing, fixed price
All designs were aligned with legal basement apartment requirements to ensure full compliance and approval without delays.
The layout we designed:
Bedroom: 135 sq ft, egress window on the north wall facing the side yard
Living area: 160 sq ft, open to the kitchen
Kitchen: 90 sq ft, galley layout, full appliances
Bathroom: 55 sq ft, 3-piece (shower, toilet, vanity)
Laundry closet: stackable washer/dryer rough-in
Utility room: separated and accessible to the main floor via the mechanical chase
Side entrance: new door opening through foundation wall, concrete steps, landing
Total permit timeline: Town of Whitby building permit approved in 4.5 weeks. ESA electrical permit processed concurrently. Construction started the week permits arrived.
The Process: Week by Week
Weeks 1-2: Framing & Rough-In All stud walls framed. Egress window opening cut. Concrete cutting for the kitchen drain line. Plumbing rough-in - drain lines, supply lines, vent stack. HVAC: a ductless mini-split rough-in for the suite's independent heating and cooling system.
Basement framing and rough-in during legal suite renovation in Whitby Ontario | Urban Renoprojects
Week 3: Electrical Rough-In Licensed ESA electrician ran all circuits - bedroom, living area, kitchen (20-amp small appliance circuit, dedicated refrigerator circuit), bathroom (GFCI), and smoke alarm interconnection. ESA rough-in inspection booked and passed at the end of Week 3.
Week 4: Framing Inspection & Insulation Town of Whitby framing inspection - passed first attempt. No revisions required. Insulation installed immediately after: R-24 mineral wool in all exterior walls, vapour barrier continuous throughout. Insulation inspection passed same week.
Weeks 5-6: Fire Separation & Drywall 15.9mm Type X drywall on ceiling and walls between units - 30-minute fire separation rating. Fire-rated door with self-closing hardware between suite and mechanical room. Then standard drywall throughout the suite. Taped, mudded, sanded.
Weeks 7-8: Flooring & Tile Dimple mat moisture barrier over concrete floor, plywood subfloor panels, then luxury vinyl plank throughout living areas and bedroom. Porcelain tile in bathroom and kitchen wet areas. Bathroom tile completed - shower surround, floor, and feature band.
Completed legal basement suite kitchen in Whitby Ontario quartz countertop and stainless appliances | Urban Renoprojects
Weeks 9-10: Kitchen, Bathroom & Finishes Semi-custom cabinetry installed - light grey shaker doors, soft-close hardware. Quartz countertop. Under-cabinet lighting. Stainless appliances - fridge, range, dishwasher, range hood vented to exterior. Bathroom vanity, toilet, and shower fixtures installed. Pot lights throughout, switch and outlet covers, paint - two coats throughout in a warm off-white.
Weeks 11-12: Entrance, Inspections & Handover Side entrance completed - new door, concrete steps, landing, exterior lighting. Final building inspection by Town of Whitby - passed. ESA Certificate of Acceptance issued. Full walkthrough with homeowners. Deficiencies: zero. Handover package: closed permit, ESA certificate, warranty documentation.
The After: What Was Delivered
The completed legal basement suite:
600 sq ft, fully finished, fully permitted legal secondary suite
1 bedroom with egress window - OBC compliant
1 full 3-piece bathroom with porcelain tile
Full galley kitchen - semi-custom cabinetry, quartz countertop, stainless appliances
Independent ductless mini-split heating and cooling
Interconnected smoke and CO alarms - wired to main floor
30-minute fire separation between units - Type X drywall, fire-rated door
Private side entrance - concrete steps, landing, exterior lighting
Stackable laundry rough-in
Registered with the Town of Whitby as a legal secondary suite
Timeline: 12 weeks construction. 16.5 weeks total from first contact to handover and registration.
Basement bedroom with egress window in completed legal suite Whitby Durham Region | Urban Renoprojects
The Numbers: Cost, Income & ROI
For a detailed breakdown, refer to basement renovation cost in Durham to better understand pricing benchmarks.
| Item | Amount |
|---|---|
| Total project cost (fixed price) | $112,000 + HST |
| Permit and drawing fees (included in above) | $3,800 |
| Monthly rental income | $1,750/month |
| Annual rental income | $21,000/year |
| Simple payback period | 5.3 years |
| Estimated resale value addition | $75,000 - $90,000 |
| Total return (5 years income + resale value) | $180,000 - $195,000 |
At $1,750/month, this basement suite will have returned its full construction cost in rental income within 5.5 years - and continue generating $21,000 per year indefinitely after that. Combined with the resale value contribution, the total 10-year return on this investment exceeds $280,000.
This is what a licensed basement contractor in Durham can deliver when the project is planned correctly, built to code, and completed on a fixed price. For a deeper financial analysis, see our basement renovation ROI guide.
What the Homeowner Said
"We'd been putting this off for years because it felt overwhelming - permits, contractors, inspections, all of it. Urban RenoProjects handled every single piece of it. We signed one contract, they handled everything, and twelve weeks later we had a tenant. The fixed price held exactly. Not a dollar over."
- Whitby homeowner, 2025
View our completed legal suite projects →
Frequently Asked Questions
How much does a 600 sq ft legal basement suite renovation cost in Durham Region?
Based on this Whitby project, a fully permitted 600 sq ft legal suite - including fire separation, egress window, separate side entrance, full kitchen, 3-piece bathroom, flooring, and all trades - came in at $112,000 plus HST. Most legal suite projects in Durham Region land between $85,000 and $140,000 depending on existing conditions, ceiling height, and finish level. The biggest variables are whether plumbing rough-ins already exist and whether a separate entrance requires significant structural work.
How long did this basement renovation take from start to finish?
This Whitby project took 16.5 weeks total from first contact to handover and municipal registration - 4.5 weeks for permit approval and 12 weeks of construction. Projects with more complex layouts or underpinning requirements run longer. Legal basement suite timelines in Durham Region typically range from 14 to 26 weeks total depending on scope.
How did Urban RenoProjects handle the permit process for this project?
Urban RenoProjects prepared all architectural drawings, submitted the building permit application to the Town of Whitby, tracked approval, and managed the ESA electrical permit concurrently. The homeowners had no contact with the building department or the ESA at any point. All inspections - framing, insulation, ESA electrical rough-in, fire separation, final building, and ESA Certificate of Acceptance - were scheduled and managed by Urban RenoProjects.
What rental income can a legal basement suite in Whitby generate?
This suite rented for $1,750/month in early 2026. Current market rates for a 1-bedroom legal suite in Whitby and across Durham Region run 1,500-1,900/month. A 2-bedroom suite commands 1,900-2,400/month. Rental demand in Durham Region is consistently strong - vacancy rates have remained low for five consecutive years driven by GTA spillover and local employment growth.
Can Urban RenoProjects build a similar legal suite in my Durham Region home?
Yes. Urban RenoProjects builds legal basement suites across Whitby, Oshawa, Ajax, Pickering, and Clarington. The first step is a free site assessment - we measure ceiling height, check for existing rough-ins, confirm zoning eligibility, and tell you exactly what your basement can become and what it will cost. There is no obligation and no cost for the assessment.
See more FAQs - Frequently Asked Questions.
Is Your Basement the Next Transformation?
Every basement in Durham Region has a before. The question is what the after looks like - and what it's worth.
Urban RenoProjects is a licensed basement renovation contractor serving Durham Region - Whitby, Oshawa, Ajax, Pickering, and Clarington. We've been recognised as one of the best basement renovation companies in Durham for our fixed-price contracts, full permit management, and OBC-compliant builds.
If your basement looks anything like this project did before construction started - or if you're wondering whether your ceiling height, existing rough-ins, and layout could support a legal suite - the first step is a free site assessment.
We'll tell you exactly what your basement can become, what it will cost, and what it will return.
New side entrance for legal basement suite in Whitby Ontario | Urban RenoProjects
Urban RenoProjects - Licensed Basement Renovation Contractor, Durham Region. WSIB Certified. Fully Insured. Ontario Building Code compliant. Serving Whitby, Oshawa, Ajax, Pickering, and Clarington.
