Calgary Basement Development Done Right, Fixed Price, Fully Permitted
OAF Construction is a Calgary basement development company with a 4.9★ HomeStars rating, Best of HomeStars 2024 & 2025, and 200+ Calgary projects delivered. Every basement we build is permitted, inspected, and finished under a fixed-price contract. Whether you want a lifestyle basement (family room, guest bedroom, wet bar) or a revenue-generating legal suite, we build it once, we build it right, and we hand you one number at the start. No T&M. No surprise change orders. No “unexpected conditions” upsells halfway through.
What’s Included in an OAF Basement Development
Every basement development Calgary project from OAF includes:
- Development Permit and Building Permit applications, prepared and filed by us
- Engineered drawings stamped by an Alberta-licensed professional where required
- Insulation upgrade to current code (basement walls, rim joists, slab if specified)
- Framing, drywall, and paint
- Bathroom rough-in and finish (tub or shower, vanity, toilet, exhaust)
- Bedroom(s) with closet, code-compliant egress window
- Electrical (recessed lighting, outlets, dedicated circuits, smoke and CO detectors interconnected to upstairs)
- Plumbing (rough-in additions, fixtures, hot water capacity check)
- HVAC (heating capacity verification, return air, supply runs)
- Flooring (LVP, carpet, or tile, you choose)
- All Calgary inspections coordinated and attended
- Final cleanup and five-year warranty visit
You sign one contract. We deliver a finished, inspected, livable basement.
Real Calgary Basement Development Pricing in 2026
Realistic 2026 pricing for fully permitted, code-compliant basement development Calgary projects:
| Project Type | Square Footage | Fixed Price Range |
|---|---|---|
| Lifestyle basement, basic finish | 800 to 1,000 sq ft | $45,000 to $62,000 |
| Lifestyle basement, premium finish | 1,000 to 1,400 sq ft | $65,000 to $92,000 |
| Lifestyle basement with wet bar + theatre | 1,200 to 1,600 sq ft | $85,000 to $115,000 |
| Legal suite (1-bed) | 600 to 750 sq ft | $58,000 to $78,000 |
| Legal suite (2-bed) | 800 to 1,000 sq ft | $75,000 to $98,000 |
| Legal suite + underpinning | 800 to 1,100 sq ft | $115,000 to $136,500 |
Every line in this table is a real number from a real OAF contract. The biggest swing factors: square footage, number of bathrooms, how much demolition is required, finish level, and whether the project includes a legal suite (which adds permits, fire separation, and SSIP processing). Subtract $10,000 for the SSIP grant on every legal suite that qualifies.
How OAF Develops Your Basement
- Free on-site consultation. 30 to 45 minutes at your home. We measure, walk the space, check ceiling height, identify mechanical constraints, and discuss layout.
- Fixed-price proposal. Detailed line-item quote within 5 to 7 business days. One number, payment schedule attached.
- Design finalization. Our in-house designer drafts floor plans. You approve before permits are filed.
- Permits. OAF submits Development and Building Permits to the City of Calgary. Typical issuance 4 to 8 weeks for a lifestyle basement, 6 to 10 weeks for a legal suite.
- Construction. Demolition (if any), framing, mechanical rough-in, insulation, drywall, finishes. Typical lifestyle basement: 6 to 10 weeks. Legal suite: 8 to 14 weeks.
- Inspections. Framing, insulation, electrical, plumbing, gas, final. OAF schedules and attends every one.
- Handover. Walk-through with you, deficiency list closed within 7 days, warranty paperwork in your hands.
End to end: 3 to 5 months for a lifestyle basement, 4 to 7 months for a legal suite.
Why Calgary Homeowners Choose OAF
- 200+ basements completed across Calgary. Every quadrant, every common floor plan, every common challenge.
- Fixed-price contracts on every quote. The price we sign is the price you pay.
- In-house framing and finish team. Our crews are T4 employees on staff. Trades (electrical, plumbing, gas) are vetted long-term partners.
- WCB Alberta + $5M commercial liability. Worker injuries and property damage are never your problem.
- Permit and inspection management. You never deal with the City. We do.
- Current on Calgary zoning. Council voted to repeal blanket rezoning on April 8, 2026 (effective August 4, 2026); a July 21 hearing is expected to keep secondary suites permitted in all low-density districts. We run live Land Use Bylaw lookups against your specific address — we know exactly what current rules apply.
Calgary Areas We Serve
We serve every quadrant of Calgary: NW, NE, SW, SE, and the City Centre. Established communities (Killarney, Altadore, Mount Pleasant, Bridgeland, Inglewood) and newer ones (Auburn Bay, Mahogany, Legacy, Carrington, Livingston). We also take basement development projects in Airdrie, Cochrane, Chestermere, and Okotoks. SSIP applies to Calgary addresses only; outside Calgary we will tell you what local incentives apply.
Frequently Asked Questions
How long does basement development take in Calgary? A typical lifestyle basement takes 6 to 10 weeks of construction once permits are issued. Permits take 4 to 8 weeks. Total elapsed time from signed contract to completion is usually 3 to 5 months. A legal suite adds 4 to 6 weeks because of additional inspections, fire separation, and SSIP processing. Underpinning projects add 4 to 6 weeks of demolition and structural work on top.
Do I need a permit to develop my basement in Calgary? Yes. Calgary requires a Building Permit for any basement development that adds bedrooms, bathrooms, kitchens, or alters mechanical systems. A Development Permit is also required for legal suites. Building without permits voids most homeowner insurance, makes the basement unsellable as finished space, and exposes you to City-ordered demolition. OAF files every permit on every project.
Can OAF turn my basement into a legal suite? Yes, if your zoning permits a secondary suite. Calgary’s zoning is in transition — Council voted to repeal blanket rezoning in April 2026 (effective August 2026), with a July 21 hearing expected to keep secondary suites permitted as a use in all low-density districts. We run a live Land Use Bylaw lookup on your specific address during the free consultation, so you know exactly what current rules apply. Legal suite construction starts at $58,000 and qualifies for the $10,000 SSIP grant. See our dedicated legal suite Calgary page for the full process.
What about the Dec 31 illegal suite amnesty? Calgary is running a legalization amnesty until December 31. Existing unpermitted basement suites can be brought to legal status without penalty before the deadline. After Dec 31, enforcement and fines resume. If you have an illegal suite, this is the window to fix it. OAF handles legalization projects under the same fixed-price framework.
How is OAF’s price different from a $30K basement quote? A $30,000 basement quote typically excludes permits, engineered drawings, mechanical scope, and a real bathroom. It is also usually T&M, meaning the final number is unknown. When you add the missing scope and account for overruns, the final cost on a $30K bid is often $50K to $60K. OAF’s fixed price is the all-in number, no surprises.
Do you do basement renovations on already-finished basements? Yes. Layout changes, bathroom additions, wet bar installs, theatre rooms, and finish upgrades on existing finished basements. Pricing is project-specific. We quote these as fixed-price scopes after a free consultation.
Related OAF Resources
- Basement Development service overview
- How much does it cost to develop a basement in Calgary?
- Calgary basement development permit process
- Legal suite Calgary builder
- Contractor red flags before you sign
Book Your Free Calgary Basement Consultation
If you are ready to develop your basement, book a free 30-minute consultation. We will measure, walk the space, run a zoning check, and deliver a fixed-price quote within a week. Calgary’s most reviewed basement development team is one form away.