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Home Extensions & Bumpouts In Ottawa
Whether your family is growing, you need more storage, or you simply want the freedom of more space in your home, we can provide you with fantastic home extension solutions. We can prepare and assist you throughout the process of adding extra rooms and spaces to both the interior and exterior of your home. Our Ottawa-based expert team is experienced in constructing home additions of all types and sizes. Let’s see how we can accommodate your special project.
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Grow Your Home Without Moving
A home extension is the most direct way to gain real square footage on the floor where you already live. By building out into your yard, OGC can enlarge a cramped kitchen, add a main-floor family room, create a primary suite, or open up a dining area, all tied seamlessly into your existing Ottawa home.
Not every project needs a full extension. A bump-out adds just a few feet where it counts, room for a kitchen island, a breakfast nook, or a larger bathroom, at a fraction of the cost of a large addition. Whether you want a modest bump-out or a full rear extension, we design, permit, and build it under one roof.
- Enlarge a kitchen, family room, dining area, or primary suite
- Bump-outs add space where you need it, without a full addition
- Foundation, framing, and exterior matched to your existing home
- Fixed pricing, permits handled, and a 7-year warranty
How Our Home Extensions in Ottawa Work
Building out means new foundation, structure, and a clean tie-in to your existing home. Here is the design-build process OGC follows to take your extension or bump-out from first idea to finished, inspected space.
We start at your home to see how you want to use the space, look at your yard and where you can build, and talk honestly about budget before you commit to anything.
- On-site review of the room, the yard, and your goals
- Early read on setbacks and how far out you can build
- Ballpark budget range so you can plan with real numbers
Our designers turn your ideas into a real layout and photorealistic renderings, so you can see how the new space flows into your existing rooms before we build.
- Floor plans designed around how the space connects
- 3D renderings of the interior and matched exterior
- Revisions until the design is exactly right
Building out affects your lot coverage and setbacks, so zoning matters. We confirm what your lot allows, engineer the new foundation, and handle the full City of Ottawa permit process.
- Lot-coverage and setback compliance confirmed
- Stamped foundation and structural drawings
- Building permit and any minor variance handled by OGC
Before construction begins, you get a detailed, fixed-price contract covering the full scope. The number you approve is the number you pay, backed by our price-match guarantee.
- Line-by-line scope with no vague allowances
- Fixed price with no surprise change orders
- Financing options available for qualified homeowners
We pour footings below Ottawa's frost line, frame the new space, and tie the roofline, siding, and floor levels into your existing home so the extension looks original, not bolted on.
- Frost-depth footings and engineered foundation
- Framing, roof, and windows matched to your home
- Building envelope sealed and inspected before interior work
We finish the new space end to end, then walk the completed extension with you before the City's final inspection and hand over your warranty.
- Electrical, plumbing, and HVAC extended into the new space
- Drywall, flooring, trim, and paint completed
- Final City inspection booked and your 7-year warranty handed over
Our Home Extension Portfolio
A sample of extensions, bump-outs, and main-floor additions we have designed and built for homeowners across Ottawa.
Why Ottawa Homeowners Choose OGC
For over a decade, OGC has been Ottawa's most reviewed design-build firm, with 200+ verified reviews across Google, Houzz, and HomeStars.
True Design-Build, One Roof
Design, engineering, permits, and construction all live in-house. No finger-pointing between an architect and a builder, just one accountable team from first sketch to final inspection.
One Dedicated Project Manager
A single project manager runs your entire extension and stays reachable by phone or text the whole way through. No handoffs, no gaps, no wondering who is in charge.
See It Before We Build It
Every project starts with full 3D renderings so you can see the new space and matched exterior before construction begins. Change it on screen, not on site.
Fixed Pricing, No Surprises
What you are quoted is what you pay. No hidden fees, no mid-project change orders. OGC's price-match guarantee backs every contract we write.
Industry-Leading 7-Year Warranty
OGC backs every extension with a 7-year warranty, one of the strongest in Ottawa. Adding to your home is a major investment, and your peace of mind should match it.
Ottawa's Most Recognized Renovation Team
OGC is a member of the GOHBA, Tarion, RenoMark, CHBA, and the Ottawa Chamber of Commerce, and has been named Ottawa's Small Business of the Year. Our work has been featured on CTV, HGTV, and in Ottawa press.
Building Out in Ottawa: What's Involved
An extension adds new foundation and structure to your home, which brings a few Ottawa-specific challenges. Here is what we manage on every project.
Building out is limited by Ottawa's setback and lot-coverage rules, which cap how close to your property lines you can build and how much of the lot can be covered. We confirm what your lot allows early, so the design fits the rules from day one.
An extension needs a City of Ottawa building permit and a series of inspections. We prepare the drawings, submit the application, and manage every inspection, and if the design needs a minor variance, we handle it through the Committee of Adjustment.
Ottawa's deep frost line means a new extension needs footings poured well below grade so it will not heave over winter. We engineer and build the foundation to match your existing home and Ottawa's climate.
The hardest part of an extension is the seam. We match rooflines, siding, and floor levels and blend the new space into your existing rooms so the finished result looks like it was always part of the house.
Because most extensions build into the yard first, we can keep the existing wall closed off until the new space is weather-tight. That lets most homeowners stay home through the majority of the build.
What a Home Extension Costs in Ottawa
Cost depends on whether you are doing a small bump-out or a full extension, the new foundation required, and your finishes. Here is the range Ottawa homeowners are working within.
single-room extensions
main-floor extensions
kitchen, suite, or several rooms
Bump-Out vs Full Extension
A small cantilevered bump-out can skip a full foundation, which keeps it affordable. A full extension needs new footings and structure, so it sits higher up the range.
Foundation & Size
Home extensions in Ottawa generally run $300–$500+ per square foot all-in. The new foundation is a major cost, so the bigger the footprint, the higher the total.
Finishes & Tie-In
A new kitchen or bathroom, higher-end finishes, and reworking the existing rooms the extension connects to all move you up the range.
Want the full breakdown by project type? Read our detailed guide to home addition and extension costs in Ottawa.
Home Extension Questions
The questions Ottawa homeowners ask us most before building out.
A bump-out is a small extension, often just a few feet, that pushes one room outward to gain space for a kitchen island, a nook, or a larger bathroom. Many bump-outs are cantilevered and skip a full foundation. A home extension is larger, adds a full room or more on a new foundation, and is also called a home addition or home expansion. We build both.
Most projects fall between about $40,000 for a small bump-out and $250,000+ for a large main-floor extension, or roughly $300 to $500 per square foot all-in. The new foundation is the biggest cost, which is why bump-outs that avoid one come in lower. See our full home addition and extension cost guide for a detailed breakdown.
Yes. Adding floor area to your home requires a City of Ottawa building permit and zoning approval for setbacks and lot coverage, and some projects need a minor variance. OGC prepares the drawings and handles the entire permit and approvals process for you. Here's more on permits for home additions in Ottawa.
Construction on most extensions runs about 3 to 6 months, plus design and permitting beforehand. A small bump-out is on the shorter end, while a large multi-room extension takes longer. We give you a realistic schedule before work starts.
It depends on your setbacks and how much of your lot is already covered. Many Ottawa lots have room for a rear or side extension, and even a tight lot can usually fit a bump-out. We check your zoning at the free consultation and tell you exactly what is possible before you invest in design.
Yes. Matching the extension to your existing home is a core part of our work. We blend the roofline, siding, windows, trim, and interior finishes so the new space reads as original, not as an obvious add-on.
Usually, yes. Because an extension is built into the yard first, we can keep the existing exterior wall closed off until the new space is weather-tight, so most homeowners stay home through the majority of the build. We will tell you honestly what to expect for your specific project.
Areas We Serve
OGC designs and builds home extensions and bump-outs across Ottawa and the surrounding region, including:
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1886 Merivale Road #200, Nepean, ON K2G 1E6Sit with a specialist and visit our design center.
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