What does it cost to build a custom home in Ottawa?
Where the money actually goes
On a real Ottawa estate build, this is how construction cost divided up. Note the top of the list: mechanical, electrical and energy systems — geothermal and high-performance mechanicals — were the single biggest line, ahead of structure. That's why a smaller home with serious systems can cost more per foot than a larger, simpler one.
| Cost category | Share | |
|---|---|---|
| Mechanical, electrical & energy systems | 26% | |
| Foundation & structure | 22% | |
| Interior finish & millwork | 18% | |
| Envelope (walls, roof, windows, cladding) | 14% | |
| Site, servicing & exterior | 12% | |
| Specialty amenity (indoor pool) | 8% | |
| Soft costs (design, engineering, permits) | 3–4% |
How long it takes
About 20 to 24 months from first feasibility study to move-in on a large custom home. The design phase most often runs long — usually because of client-driven changes, not the drawings themselves.
| Stage | Duration |
|---|---|
| Feasibility | 4–8 weeks |
| Design & drawings | 20–30 weeks |
| Permits & approvals | 8–10 weeks |
| Construction | 10–14 months |
| Total (feasibility to completion) | 20–24 months |
Why we can show real numbers
Most builders quote a lump sum with the margin buried inside — so the true cost breakdown is never shown. We work open-book: on an agency construction-management model you hold every trade contract in your own name and see every real quote and invoice, unmarked. The numbers above are what a live Ottawa build actually cost, which is why we can publish them.
Want the real numbers for your site and design?
A feasibility study turns these ranges into figures for your actual project — myhomebuilders.ca · 613 400 0785
Common questions
How much does it cost to build a custom home in Ottawa?
Construction (trades only) starts in the low $300s per square foot; all-in cost, including design, engineering, permits and high-performance systems, starts around $500 per finished square foot. The final number depends far more on systems and finish level than on floor area.
Does a bigger house always cost more per square foot?
No — often the opposite. Systems and finish drive cost per foot, so a smaller home with geothermal and high-end millwork can exceed a larger, simpler build. On our estate build, energy and mechanical systems alone were about a quarter of construction cost.
How long does a custom home take to build near Ottawa?
Roughly 20–24 months from feasibility to completion: about 4–8 weeks feasibility, 20–30 weeks design, 8–10 weeks permits, and 10–14 months construction.
Note: These figures come from a specific live open-book build (a large custom estate) and are shared as a reference point, not a quote. Your cost depends on site, servicing, size, finish level, and systems; the only accurate number comes from a feasibility study and tendered trade quotes for your actual design.