Your Basement Could Be Your Best Room. Not Your Worst.
Your unfinished basement is the most underused square footage in your home. And in Calgary's housing market, it's also one of the smartest investments you can make. Whether you're adding a legal rental suite, building a home theatre, or converting that concrete box into a proper living space, OAF brings the experience and permit knowledge to do it right the first time.
What Your Basement Is Actually Worth. Developed.
A finished basement adds 50 to 75% of development costs back into your assessed home value, according to most Calgary real estate appraisers. A legal suite adds even more. The income stream is a real asset that buyers and lenders recognize.
Calgary's rental vacancy rate remains near historic lows. A legal basement suite in a desirable inner-city or established suburban neighbourhood can generate $1,400 to $2,200/month in rent. At those rates, many homeowners recover development costs within 4 to 6 years. The City of Calgary's SSIP grant can put up to $10,000 back in your pocket. And the December 31, 2026 amnesty deadline means homeowners with unpermitted suites need to act now or face enforcement.
Three Homeowners. Three Basements. One Decision.
The Family That Turned Dead Space Into Monthly Income
Interest rates went up. The mortgage payment followed. Date nights disappeared. Vacations became 'next year.' Then a tenant moved into the legal basement suite and started covering a chunk of the mortgage. Suddenly, 'next year' became 'this weekend.' This is the most common reason homeowners develop their basement into a legal suite. It's not about being a landlord. It's about not feeling the weight of your mortgage every single month.
The Family That Stopped Wasting 800 Square Feet
The basement was a storage dungeon. Holiday decorations, old bikes, boxes from two moves ago. Meanwhile, the kids had nowhere to play, the gym membership went unused, and everyone was stepping on each other upstairs. Eight hundred square feet of concrete, doing nothing. A developed basement. Home theatre, gym, home office, or playroom. Doesn't just add a room. It adds 800+ square feet of actual living space to your home, without adding a single square foot to your footprint.
The Parents Who Wanted Close. But Not That Close
Mom's getting older. The conversations about 'what's next' started happening at dinner. A nursing home felt wrong. Moving in upstairs felt suffocating. The basement in-law suite gave everyone what they needed. Proximity without invasion, independence without isolation. A basement in-law suite with a separate entrance means your parents keep their dignity, their routine, and their front door. You keep your peace of mind knowing they're 12 steps away, not 12 blocks. And you save $4,000+ per month vs. assisted living.
Every Type of Basement. One Team That Does It All.
OAF is a licensed Calgary basement development contractor handling everything from initial design through City permits, framing, mechanical, and final finishing. We work across all Calgary quadrants and we don't subcontract your project to someone else after you sign.
Legal Secondary Suites
Full legal rental suites built to Alberta Building Code. SSIP grant eligible.
→Home Theatres
Acoustic insulation, recessed lighting, surround sound wiring, and finished millwork for year-round entertainment.
Home Gyms
Rubber flooring, ventilation, LED lighting, dedicated electrical circuits, and mirrored walls built to last.
Home Offices
Egress windows for natural light, acoustic insulation for privacy, and the electrical and data rough-in you actually need.
Playrooms & Kids' Spaces
Durable, easy-clean spaces with proper lighting, safe egress, and noise contained below grade.
Wet Bars & Entertainment
Cabinetry, bar fridge rough-in, tiled flooring, plumbing and electrical done once and done right.
We Know What's Holding You Back
Developing your basement is a significant decision. Here are the concerns we hear most often. And the honest answers we give every homeowner who asks.
What if the price changes halfway through?
It won't. We use Fixed-Price Agreements. Not estimates, not ballpark figures. Your price is locked before a single wall goes up. If something costs more than we projected, that's on us. Period.
The permit process sounds overwhelming.
It is. If you do it alone. We don't hand you a checklist and wish you luck. We handle the full permit process: development permits, building permits, inspections, and final approval. You sign where we tell you. We handle everything else.
How long will this actually take?
We quote 8 to 14 weeks for construction because honest timelines account for inspections, permits, and real-world variables. For legal suites, add 4 to 8 weeks upfront for City permit processing. Other builders promise 8 weeks and deliver 20. We'd rather be upfront than apologetic.
Will my basement feel like a basement?
Not when we're done with it. We build basements with proper lighting design, egress windows for natural light, full insulation, and finishes identical to above-grade standards. LVP flooring, drywall, trim, paint. Your basement will feel like the rest of your home, not a compromise.
Do I really need a permit?
Yes. Any basement development involving new walls, electrical, plumbing, or HVAC requires a Building Permit from the City of Calgary. Working without a permit creates problems when you sell and voids your home insurance for work performed. OAF includes permit management in every project we quote.
Every Builder Claims Quality. Here's What We Actually Do Differently.
We've looked at what every basement contractor in Calgary says. They all say the same thing. Here's what we actually do. And what you can verify before you sign anything.
Fixed-Price Agreements
Not 'estimates.' Not 'ballpark ranges.' A contractually locked price before design begins. If the project costs more, we absorb it. Your budget is your budget.
Best of HomeStars 2024 & 2025
Two years running. Awarded based on verified client reviews, completion rates, and service quality. Not self-nominated. Earned by our clients' words.
4.9 Stars Across 40+ Reviews
Across HomeStars and Google. Verified reviews from real Calgary homeowners who lived through our process. Read them. Call them. We'll provide references.
Price Before Design
Most builders make you pay for design before quoting a price. We give you your fixed price first. So you never invest in plans for a project you can't afford.
Honest Timelines
8 to 14 weeks. That range exists because we account for inspections, permits, and real-world conditions. We don't promise 8 to win the contract and deliver 20.
5-year Warranty
Full workmanship warranty on everything we build. If something we did isn't right, we come back and fix it. No arguments. No invoices. That's the deal.
What Basement Development Actually Costs.
While most builders hide pricing behind 'contact us for a quote,' we believe you deserve to know what you're looking at before you make a call. Here's the real range. No surprises, no asterisks.
Open-Plan Basement
From $35,000A basic open-plan finish for homeowners who want a clean, functional rec room, family space, or multi-use area. Standard finishes built to last.
- Open-concept layout (rec room, family room)
- Standard carpet flooring throughout
- Standard drywall, taping, and paint
- Recessed LED lighting
- Standard electrical outlets and switches
- Standard trim and baseboards
- All permits and inspections included
Specialty Development
$55,000 to $75,000Home theatre, gym, office, or entertainment space with upgraded finishes, dedicated electrical, and purpose-built features. The full lifestyle upgrade.
- Purpose-built rooms (theatre, gym, office, bar)
- Upgraded LVP flooring throughout
- Upgraded drywall with acoustic insulation
- Dedicated electrical circuits for equipment
- Upgraded lighting design
- Custom millwork and cabinetry options
- Plumbing rough-in for wet bar or bathroom
- All permits and inspections included
Full Secondary Suite
$58,000 to $85,000A permit-approved, code-compliant legal secondary suite with separate entrance, full kitchen, bathroom, and City registration. SSIP grant eligible.
- 1 to 2 bedroom layout with separate entrance
- Full kitchen with appliance rough-in
- Full bathroom (3-piece minimum)
- Fire-rated separation between suite and home
- Independent electrical panel
- Smoke and CO detection throughout
- In-suite laundry hookups
- SSIP grant coordination included
- All permits, inspections, and City registration
Low ceiling height? If your basement ceiling is below 6'5" (the Alberta Building Code minimum under beams), underpinning is required. Budget an additional $60,000 to $130,000 depending on scope. We assess ceiling height during your free consultation. Cost per square foot in Calgary typically runs $45 to $85 depending on finish level.
Work completed to city code, with great attention to detail and high-quality results. The team was professional from start to finish and delivered exactly what was promised.
Delivered as scheduled and on budget with guidance throughout the entire process. The communication was excellent. We always knew what was happening and what came next.
Excellent customer service and great work done. Fair price range as well. Highly recommended for basements and garages.
Our Process
Consultation
Free on-site visit. We walk the space, understand your vision, and assess the scope. No obligation.
No pressure. No cost. Get a Free Quote →Fixed-Price Proposal
You receive a detailed, itemized proposal with a fixed price. What we quote is what you pay.
No surprise costs. Ever.Permits & Build
We handle all City of Calgary permits, inspections, and construction. You get weekly progress updates.
Fully permitted. Fully insured.Handover
Final walkthrough, punch list completion, and handover with all warranty documentation and permits.
Built beyond code.Want to Run the Numbers Yourself?
Now that you've seen the pricing and process, use our free tools to estimate your build cost or pick the right path for your home.
Calgary Neighbourhoods We Serve
OAF builds across all four Calgary quadrants and surrounding communities. We don't subcontract and we don't limit our service area.
NW Calgary
Tuscany, Edgemont, Rocky Ridge, Citadel, Hamptons, Varsity, Brentwood, Dalhousie
SW Calgary
Signal Hill, Aspen Woods, Springbank Hill, Glamorgan, Lakeview, Glenmore, Garrison Woods
SE Calgary
Mahogany, Auburn Bay, McKenzie Towne, New Brighton, Riverbend, Douglasdale, Forest Lawn
NE Calgary
Taradale, Saddleridge, Martindale, Coral Springs, Abbeydale, Pineridge
Inner City
Bridgeland, Inglewood, Ramsay, Capitol Hill, Mount Pleasant, Hillhurst, Killarney
Surrounding
Airdrie, Chestermere, Okotoks, Cochrane, Strathmore
Basement Development FAQs
A standard basement finish takes 8 to 14 weeks from permit approval to completion, depending on scope. For legal suites, add 4 to 8 weeks upfront for City permit processing. Total timeline from first consultation to move-in is typically 4 to 6 months for a legal suite, 3 to 4 months for a non-suite development.
Yes. Any basement development involving new walls, electrical, plumbing, or HVAC requires a Building Permit from the City of Calgary. Working without a permit creates problems when you sell the property and voids your home insurance for work performed. OAF includes permit management in every project we quote.
Plan on $35,000-$55,000 for a basic open-plan finish, and $58,000-$85,000 for a full legal suite with separate kitchen and bathroom. If your basement ceiling is below 6’5″ and you need underpinning, budget an additional $60,000-$130,000. Use our cost estimator for a property-specific figure.
Yes, once the City of Calgary issues your final occupancy approval, you can rent the suite. For SSIP grant recipients, a 2-year short-term rental (Airbnb) restriction applies, but long-term rental is permitted immediately.
A finished basement is any below-grade space improved for living use. A legal suite is a finished basement that meets the specific City of Calgary and Alberta Building Code requirements to function as a self-contained rental unit, separate entrance, full kitchen, bathroom, and registered with the City. Legal suites are eligible for grants and rental income. Standard finished basements are not.
Calgary homeowners with unpermitted basement suites have until December 31, 2026 to voluntarily legalize them under the City’s amnesty program. After that date, the City moves into active enforcement mode, which means fines, mandatory work orders, and potential loss of rental income. If you have a suite that was built without permits, OAF can assess it and develop a legalization plan.
Resources & Portfolio
Guides, articles, tools, and project examples to help you plan your basement development.
This Isn't Storage Anymore. It's Your Next Chapter.
We don't take every project. We take the right ones. Homeowners who understand that a developed basement is an investment, not an expense. People who value transparency, expect quality, and are ready to make their home work harder for them. If that sounds like you, we should talk.
Get a Free Quote- You own your Calgary home
- You want quality that lasts
- You want a clear, fixed price
- You're ready to start within 3 months