Core Renovations
Home additions in Calgary
Second-storey, main-floor and lower-level additions that look original to the house.
For Calgary homeowners who love their street, an addition is the most direct way to get the space they need without moving. Done well, it reads as part of the original house, inside and out.
Kay2 has won BILD Calgary Region's Best Home Renovation with Addition award and built additions that hold indoor pools, primary suites and home offices. We design the structure, roofline and exterior tie-in with the interior, so the new space feels like it was always there.
What's included
- Second-storey and main-floor additions
- Lower-level and pool additions
- Primary suites, home offices and family rooms
- Structural engineering and foundations
- Roofing, siding and mechanical tie-ins
- Development and building permits
4.7on Google · 81 reviews
2× Renovator of the YearBILD Calgary Region, 2018 & 2022
CHBA National AwardBest Basement Renovation in Canada
Fixed-price contractsOne team, one project manager
Before & after
Additions that look like they were always there.
Drag the slider on each photo to compare the home before and after Kay2's work.
Mayland Heights: Whole-Home Renovation with Basement Pool · Front exterior
What we plan for
A Kay2 home addition, considered from every angle.
The decisions that separate a good result from an exceptional one, and how we handle each.
01
Up, out or down
Second-storey, main-floor or lower-level additions each have different structural, zoning and cost implications. We help you choose.
02
Zoning and permits
Setbacks, height and lot coverage under City of Calgary rules shape what's possible. We check these before design begins.
03
Matching the original
Rooflines, windows, siding and interior trim are designed so the addition looks like it was always part of the house.
04
Structure and foundations
Engineering, foundations and tie-ins to the existing structure are planned and permitted before construction.
05
Systems and comfort
Heating, ventilation and electrical are extended or upgraded so the new rooms are as comfortable as the rest of the home.
Local expertise
Home additions in Calgary: what to know
Additions in Calgary need a building permit and, depending on the design and your property's zoning, a development permit. Setbacks, height limits and lot coverage shape what can be built, especially on inner-city lots.
Kay2 has built additions across Calgary and the surrounding area, including a second storey on a St. Andrew's Heights bungalow, a main-floor expansion in Lower Springbank, three additions in Mayland Heights and a pool wing on Chestermere Lake. Each was designed to read as original to the home.
Proof, not promises
See it built by Kay2.
Kay2 has won BILD Calgary Region's Best Home Renovation with Addition award twice, in 2018 (Mayland Heights) and 2022 (Luxurious Lakeside Living, Chestermere), and was a finalist in 2024 for Lower Springbank Serenity.
Read Kay2's 81 Google reviews
St. Andrews Heights, NW Calgary
St. Andrews Heights Second-Storey Addition
A two-bedroom bungalow rebuilt for a family of four, with a second storey of more than 800 sq ft, a new main floor and a modern exterior.
- Additions
- Whole home
- Kitchens
- Ensuites
- Exteriors
★ 2024 BILD Calgary Region Awards finalistLower Springbank, Calgary
Lower Springbank Home Addition
A main-floor addition and a new modern exterior, with a kitchen built around a large island, a reworked primary suite and a covered deck facing the mountains.
- Additions
- Whole home
- Kitchens
- Ensuites
- Exteriors
★ 2022 BILD Calgary Region Renovator of the YearChestermere, AB
Chestermere Lake Pool & Spa Addition
A lakeside home expanded for luxury and entertaining, with a 1,000 sq ft lower-level indoor pool and spa, a second-storey primary suite with a large walk-in closet, and a folding wall of windows facing the lake.
- Pools & spas
- Additions
- Whole home
- Ensuites
Why Kay2
Why Calgary homeowners choose Kay2 for home additions.
The concerns we hear most are budget creep, timelines slipping and nobody taking ownership. This is how we prevent them.
Twice Renovator of the Year
BILD Calgary Region's top renovation honour in 2018 and 2022, plus a CHBA national award.
One team, one contract
Design, estimating, project management and construction under one roof. No hand-offs, no finger-pointing.
Fixed-price contracts
Scope is drawn and priced before construction, so the number you sign is the number you plan around.
One project manager
The person who plans your project runs it to handover, with a weekly status email.
Hiring separately
- Designer, contractor and trades each with their own contract
- Drawings priced after they're finished, often over budget
- Several people to call when something changes
Kay2 design-build
- One team and one contract from first sketch to handover
- Design priced as it's drawn, then a fixed-price contract
- One project manager who makes the call on site, same day
Planning home additions in Calgary?
Start with a complimentary consultation with a Kay2 estimator.
How your project runs
- 01ConsultationA complimentary conversation about your home, how you want to live in it and what must be included.
- 02BudgetAn estimator shapes your wish list into a scope and budget, with options you may not have considered, and discusses financing.
- 03DesignArchitectural drawings, then finishes and fixtures chosen at the Showroom. Permits, lead times and each phase are scheduled before work begins.
- 04BuildStructure, systems and finishes built to the drawings, on a protected and tidy site, with a weekly status email.
- 05CompletionA detailed walkthrough checklist, final inspections and sign-off only when you are fully satisfied.
Investment
Typical Calgary ranges: a main-floor extension from $80,000 to $150,000; a basement and main-floor expansion from $200,000 to $300,000; a second storey over the existing home from $250,000 to $500,000 or more. Design, size and what the space includes, such as a kitchen or bathroom, set the final figure in your fixed-price proposal.
Timeline
Your schedule is set before construction begins, including permits and material lead times, and you get a weekly status email throughout.
Free guide · 2026 edition
Plan your budget with our free cost guide.
The Calgary Renovation Cost Guide 2026: real investment ranges for kitchens, bathrooms, basements, additions and whole-home renovations, plus the hidden costs to plan for.
Your first step
What your complimentary consultation includes.
- A conversation about your homeYour goals, how you live, what isn't working today and what must be included.
- An estimator's honest viewScope, feasibility and options you may not have considered, before anything is drawn.
- Clear next stepsHow budget, design, permits and financing will work for your project, and roughly when work could start.
- No cost, no pressureThe consultation is complimentary. Ask us the hard questions; there's no obligation afterwards.
On video
Home Additions by Kay2, on video.
Homeowner advice · 0:30
Build up or build out? Choosing a home addition
When a second storey makes sense, when a main-floor addition is better, and how lot size, yard and budget decide.
FAQ
Home Additions in Calgary: your questions answered
Can't see your question? Call 403.273.2202 or send us your project.
How much does a home addition cost in Calgary?
As a guide, a main-floor extension typically runs $80,000 to $150,000, a basement and main-floor expansion $200,000 to $300,000, and a second-storey addition over the existing home $250,000 to $500,000 or more. Adding a kitchen or bathroom, the size and the structural work set the final price, which Kay2 confirms in a fixed-price proposal after design.
Do I need a permit for a home addition in Calgary?
Yes. Additions require a building permit and often a development permit from the City of Calgary. Kay2 prepares the drawings and engineering and manages the permit process for you.
Can you add a second storey to a bungalow?
Often, yes, depending on the existing structure and zoning. We assess the foundation and framing, then design an addition that matches the home's character.
Will the addition match the rest of my house?
That is the goal of every Kay2 addition. Rooflines, windows, exterior materials and interior finishes are designed together, so the addition reads as original to the home.
Service area
Serving Calgary and the surrounding area
Kay2's award-winning and award-finalist work includes homes in Bankview, Rutland Park, Stanley Park, Southwood, Mayland Heights and Bridgeland in Calgary, in Lower Springbank, and on Chestermere Lake. We work across Calgary's inner-city and established neighbourhoods and in nearby Chestermere, Springbank, Airdrie, Okotoks, Cochrane, Strathmore, Canmore and Banff. Every project is planned from our Showroom and Design Centre at 3336 47 Ave SE, Calgary.
Guides
Plan with confidence.
Costs · 3 min read
How to Plan a Successful Home Addition in Calgary: Costs, Permits & Design Tips
Planning a home addition in Calgary is an exciting opportunity to transform your space, increase your property value, and create a home that grows with your lifestyle. Whether you need an extra…
April 19, 2025 · Read →
Hiring & planning · 8 min read
Do I Need a Permit to Renovate My House in Calgary? (2026)
Most homeowners find out they needed a permit at the worst possible moment: when a neighbour complains, when an inspector shows up, or when they go to sell and the buyer’s lawyer asks for…
September 23, 2026 · Read →More core renovations