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Construction Mortgage Calgary: Custom Home Financing (2026)

A Calgary construction mortgage advances funds in three to four progress draws — foundation, lock-up, drywall, and completion — each released only after a lender-ordered inspection. Expect roughly 25% of total project cost in cash up front, interest-only payments on drawn funds, and a 10% builders’ lien holdback under Alberta’s Prompt Payment and Construction Lien Act.

Last updated: September 2, 2026

Most of the financing questions that arrive at our office are not really about interest rates. They are about timing. A client understands what the home costs. What they do not yet understand is when the money leaves their account, when the lender replaces it, and how large the gap between those two moments becomes.

That gap is the entire subject of this article.

Construction mortgage vs. completion mortgage vs. paying cash

There are three ways a Calgary custom home gets paid for, and they behave very differently in terms of cash flow.

	Construction (draw) mortgage	Completion mortgage	Cash / self-funded
Who carries the build cost	You, progressively, with lender advances	The builder, until possession day	You, entirely
When funds move	3–4 progress draws tied to inspected milestones	One lump sum at closing	On the contract payment schedule
Cash required up front	Land down payment plus equity gap, typically ~25% of project cost	Deposit only, often $5,000–$25,000	100%
Payments during build	Interest-only on the amount drawn to date	None	None
Typical fit	Custom home on a lot you own or are buying	Quick-possession or builder-inventory home	Clients with liquid capital or a sold prior home
Main risk to manage	Under-appraisal at a draw stalls the build	Rate movement between contract and possession	Opportunity cost of tied-up capital

The distinction people most often miss is this: a completion mortgage is builder-financed. The builder funds construction from its own balance sheet and working capital, and you pay once, at possession, from a conventional mortgage. That is how a quick-possession home works. Arkadian Homes builds quick-possession homes to the same standard as our custom builds — same premium materials, same finish level, same full warranty, same after-care relationship — and the financing on those is simply a standard mortgage at possession.

A construction mortgage is self-financed, with the lender reimbursing you in arrears. You are the one exposed to the timing gap, which is why the draw schedule matters so much more on a custom build than on a purchase.

Paying cash removes the draw mechanics entirely but does not remove the Alberta-specific items further down this page — the lien holdback, the warranty enrolment, and the GST treatment apply regardless of how the build is funded.

How draws work in Alberta

A progress-draw mortgage advances money for work already completed and verified by a physical inspection (WOWA, 2026). Nothing is advanced in anticipation of work. This single fact drives almost every cash-flow surprise on a custom build.

The typical draw sequence

Standard progress-draw mortgages in Canada feature 3 to 5 draws, with 4 draws serving most traditional custom builds and 5 or more accommodating large-scale estate projects (WOWA, 2026). In Alberta, a four-draw structure usually looks like this:

Draw 1 — Foundation and framing. Released once excavation, footings, foundation, backfill, and structural framing are complete and inspected. Commonly around 15% of the construction facility.
Draw 2 — Lock-up. Roof on, exterior sheathing and windows in, doors hung, building weather-tight. Commonly 25–30%.
Draw 3 — Drywall and interior. Mechanical, electrical, and plumbing rough-ins passed, insulation and vapour barrier complete, drywall boarded and taped. Commonly 25–30%.
Draw 4 — Completion. Occupancy achieved, deficiencies addressed, final inspection and appraisal complete. The balance, less any holdback.

The inspection is the gate

Each draw requires a third-party progress inspection by a lender-ordered, AIC-designated appraiser or an inspection network such as Solidifi or NAS. Budget $200–$350 per visit, paid by the borrower — some lenders deduct the fee directly from the draw rather than invoicing separately. On a four-draw build that is roughly $800–$1,400 in inspection cost, and it is a line item most first-time custom clients have not planned for.

The appraiser is not inspecting for quality. They are inspecting for percentage of completion, and the number they write down determines the size of your cheque.

Cost-to-complete vs. cost-to-date — and why under-appraisal stalls a build

Lenders assess draws using one of two methods, and it is worth asking which one your lender uses before you sign.

Cost-to-date. The appraiser values the work physically in place and advances against that. Straightforward, but it means every dollar of work is funded after you have already paid for it.
Cost-to-complete. The appraiser estimates what remains to be spent to finish the home to the approved plans and specifications, then works backwards to confirm the loan can still cover it. This is the more conservative method, and it is the one that produces mid-build surprises.

Under-appraisal is the most common reason a Calgary build stalls. If the appraiser assesses completion at 40% when your builder has invoiced at 50%, the draw arrives short. You cover the difference in cash, or trades stop. Because a single delayed draw can push a trade crew to another site and cost weeks of schedule rather than days, this is a project-management problem before it is a financing problem.

Three practical protections:

Ask the lender, in writing, which method they use and who orders the appraisal.
Have your builder’s milestone definitions match the lender’s draw definitions word for word. “Lock-up” should mean the same thing to both parties.
Request that draw inspections be booked in advance against the construction schedule, rather than requested after the milestone is hit.

“Every draw is a deadline with an appraiser attached to it. We build the lender’s inspection dates into the master schedule at the start, the same way we schedule concrete or roofing, so no trade is ever standing on site waiting for a cheque. That single piece of sequencing is worth more to a client’s budget than a quarter point on their rate.”

— Segun Akinrolabu, Founder, Arkadian Homes

How much cash you actually need up front

This is the number clients underestimate. Here is where it goes.

1. The land

Land is financed differently from a home, and less generously. Where the land is not already owned, lenders typically advance 65%–75% of land value (WOWA, 2026), which means a 25%–35% down payment on the lot — well above what a standard residential mortgage requires.

The gap between a serviced lot and raw land matters:

Serviced lot (water, sewer, power, and gas to the property line; municipal address; zoned and titled) sits at the upper end of that advance range and is the straightforward case. This describes most infill lots in Altadore, Marda Loop, Elbow Park, West Hillhurst, Upper Mount Royal, Lakeview, North Glenmore Park, and Briar Hill.
Raw or unserviced land (common in Springbank and Bearspaw) attracts a lower advance percentage, is sometimes declined outright, and carries servicing costs — well, septic, power run, road access — that you fund outside the construction facility.

If you already own the lot free and clear, its appraised value counts toward your equity contribution, which often satisfies most or all of the down payment requirement on its own.

2. The equity gap on construction

Most conventional lenders finance up to 75% of the project’s total value (WOWA, 2026). Your equity — cash, land value, or both — covers the remaining 25%.

3. Interest-only payments during construction

Most construction loan agreements allow interest-only payments during the construction phase (WOWA, 2026), charged only on funds actually drawn. Your payment therefore starts small and climbs with each draw. Construction draws in Alberta are commonly priced at prime plus 0.25% to 1.00% (New Homes Alberta, 2026).

On a $1.2M construction facility drawn progressively over 14 months, the average outstanding balance runs roughly 45%–50% of the facility. At around 6.5%, that is approximately $35,000–$50,000 in interest over the build — a real cost, paid monthly, out of pocket.

4. Holding costs if you still own your current home

If you are living in your existing home while the new one is built, you are carrying two properties. That means your current mortgage, taxes, insurance, and utilities plus construction interest, for 12–24 months.

Bridge financing covers the shorter version of this problem — the gap between possession of the new home and closing on the sale of the old one. It does not cover a 20-month build. Clients who need the equity from their current home to fund the build generally have two options: sell first and rent through construction, or qualify to carry both. Deciding which, before the lot is bought, prevents the most painful version of this conversation.

Illustrative cash requirement — $2.5M total project

Item	Amount
Inner-city serviced lot	$700,000
Construction contract (approx. 2,290 sq ft at $700 per sq ft)	$1,600,000
Soft costs — design, engineering, permits, legal, survey	$240,000
Total project cost	$2,540,000
Land down payment at 30%	$210,000
Additional equity to reach 25% of project cost	~$425,000
Approximate cash required across the project	~$635,000
Construction interest over ~14 months	$35,000–$50,000
Draw inspection fees (4 draws)	$800–$1,400

Design fees alone run 8%–15% of construction cost (WOWA, 2026), and they are almost entirely front-loaded — spent before a single draw is available.

Alberta-specific items that change the math

The 10% builders’ lien holdback

Alberta’s Prompt Payment and Construction Lien Act requires a major lien fund holdback of 10% of the value of work done or materials furnished. That money is retained and released only after the lien period expires.

The registration windows to know:

60 days from completion or abandonment of the contract or subcontract to register a lien — the standard case.
90 days where concrete is furnished as a material or as work done, and for improvements to an oil or gas well or well site.

The Act also imposes prompt-payment timelines: an owner pays a proper invoice within 28 days, and a contractor pays its subcontractors within 7 days of receiving that payment, with disputes raised by notice within 14 days. Practically, this means your holdback release is a scheduled event with a legal clock on it rather than a negotiation — and your lender will hold back the corresponding amount from your final draw.

On multi-year contracts, the parties may agree to release holdback on pre-determined dates or milestones instead of waiting until the end. Worth raising with your lender and builder at contract stage on any build expected to exceed 12 months.

Mandatory new home warranty

Under Alberta’s New Home Buyer Protection Act, every new home requires warranty coverage from a licensed provider before a building permit is issued. The structure is 1-2-5-10:

1 year — labour and materials
2 years — delivery and distribution systems (heating, electrical, plumbing)
5 years — building envelope
10 years — key structural components

If you build for yourself rather than engaging a licensed residential builder, you must apply for an Owner Builder Authorization from the Registrar. Warranty coverage is optional under that route — but if you decline it, the Registrar files a caveat against the Certificate of Title stating there is no warranty coverage, and the home cannot be sold to a consumer within the 10-year protection period. That caveat also affects financing and resale. It is a significant trade-off for what is usually a modest premium.

Warranty enrolment is a budget line, and it must be in place before the permit — which means before your first draw.

GST — what actually changed in 2026

This is the item where the most outdated information is circulating, so be precise.

The original GST New Housing Rebate still exists: 36% of GST paid to a maximum of $6,300, phasing out between $350,000 and $450,000, with no rebate at $450,000 or more. For any Calgary luxury build, that rebate is irrelevant.

The new First-Time Home Buyers’ GST/HST Rebate received Royal Assent and became available in 2026. It provides 100% relief of the GST on new homes valued up to $1,000,000 — a maximum of $50,000 — phasing out between $1,000,000 and $1,500,000, and eliminated entirely at $1,500,000 and above (Canada Revenue Agency, 2026).

For an owner-built home, the qualifying conditions are specific:

At least one owner-builder must be a first-time home buyer, the home must be their primary place of residence, and that individual must be the first to occupy it.
Construction or substantial renovation must begin after May 26, 2025 and before 2031.
The home must be substantially completed before 2036 and first occupied before 2036.
The application must reach the CRA within two years of substantial completion.

The practical conclusion for luxury builds is unchanged: GST applies at 5% on the full construction cost, with no rebate available. On a $1,600,000 construction contract, that is $80,000. Confirm with your builder whether the contract price is quoted inclusive or exclusive of GST — the difference is not a rounding error, and lenders will finance the GST only if it sits inside the appraised project cost.

(GST treatment depends on individual circumstances. Confirm your position with a tax professional before relying on any threshold in this article.)

Cost overruns and change orders — how contingency is, and isn’t, financed

Here is the uncomfortable truth about contingency: lenders finance the approved scope, not the change to it.

Your construction facility is sized against a specific set of drawings and specifications, appraised at a specific completed value. When you upgrade the kitchen package mid-build, or the excavation hits groundwater, or a millwork lead time forces a substitution, the cost of that change usually does not increase the loan. It comes from your pocket, in the month it occurs.

Lenders commonly recommend — and some require — a contingency of 15%–20% above the contracted build price to cover change orders, material price movement, and unexpected site conditions. On a $1.6M contract, that is $240,000–$320,000 held in reserve.

Three ways contingency actually gets funded:

Held in cash by the client. The cleanest. Uncommitted, liquid, and never counted as part of the down payment.
Built into the appraised value at underwriting. Some lenders will size the facility against a completed value that already contemplates an allowance, provided the contingency is disclosed and documented in the contract at the outset. This has to be arranged before funding, not after.
Absorbed by disciplined scope control. Detailed specifications and allowances fixed before the first draw, with every change order priced, documented, and approved in writing before work proceeds.

The third is where a Boutique Builder earns its fee. Disciplined project management means the client sees the cost consequence of a decision before the decision is made, not on the next invoice. Arkadian Homes prices luxury custom homes at $650–$1,000+ per sq ft for construction only, excluding land and soft costs, and luxury quick-possession homes at $500–$1,000 per sq ft. Those ranges hold because the specification work is done up front.

For context on the broader Calgary market, WOWA (2026) reports spec and production builds at $175–$265 per sq ft and standard custom builds at $300–$450 per sq ft. Those are general market figures for volume builders, not Arkadian’s pricing — they are useful mainly for understanding why a luxury build’s contingency, finishes, and draw profile look nothing like a production home’s.

A realistic draw timeline for a $1.5M–$2.5M Calgary build

The following assumes a $1,600,000 construction contract on an inner-city serviced lot, a four-draw facility of $1,200,000, and a 14-month construction period. Arkadian’s custom builds run 12–24 months from first conversation to move-in, which includes design and permitting ahead of the timeline below.

Month	Stage	Draw	Amount advanced	Cumulative drawn	Approx. monthly interest
Pre-construction	Design, engineering, warranty enrolment, permits	—	$0	$0	$0
0	Land closing	Land advance	65%–75% of lot value	—	Begins on land advance
1–3	Excavation, footings, foundation, backfill, framing	—	$0	$0	—
3	Draw 1 — foundation and framing complete	~15%	$180,000	$180,000	~$975
4–6	Roof, exterior sheathing, windows, doors	—	$0	$180,000	~$975
6	Draw 2 — lock-up	~30%	$360,000	$540,000	~$2,925
7–9	Mechanical, electrical, and plumbing rough-ins, insulation, drywall	—	$0	$540,000	~$2,925
9	Draw 3 — drywall and interior	~30%	$360,000	$900,000	~$4,875
10–13	Millwork, tile, flooring, paint, fixtures, landscaping	—	$0	$900,000	~$4,875
13–14	Occupancy, deficiencies, final inspection	Draw 4 — completion	$300,000 less 10% holdback	$1,200,000	Converts to permanent mortgage
+60 days	Lien period expires	Holdback release	Balance released	—	—

Two things to read off that table.

First, the flat stretches are where cash gets consumed. Months 1–3 and 10–13 carry no advance at all. That is roughly seven of fourteen months in which trades are working and invoicing while the lender sits still.

Second, interest is back-loaded. Your monthly carrying cost in month 12 is roughly five times what it was in month 3, and it lands at exactly the point where selections, upgrades, and change orders are also peaking.

Permit costs sit ahead of all of it. Calgary charges $10.14 per $1,000 of assessed value for building permits, with assessed value calculated at roughly $150 per sq ft of living area, plus $119 per inspection, a $112 administrative fee, and a Safety Codes levy of 4% of the base fee (maximum $560) (City of Calgary, Bylaw 64M94, 2026). For a 2,290 sq ft home, that is a base permit fee near $3,500 and a total in the range of $4,000–$6,000 once inspections are counted, before development permit fees.

Build the approval lead time into your financing plan as well: Development Permits take 8–16 weeks and Building Permits 4–8 weeks for standard residential in Calgary (City of Calgary, 2026). Your land loan accrues interest throughout. See our Calgary custom home timeline guide for the full sequence.

Demand context matters here too: Calgary’s population reached approximately 1.6 million in 2025 and is growing by roughly 52,800 people per year (City of Calgary economics; Alberta Regional Dashboard, 2025). Sustained demand keeps inner-city lot values firm, which is generally helpful at appraisal — and keeps trade schedules tight, which is why draw timing deserves attention.

What to settle before you sign anything

Confirm whether your lender appraises on cost-to-date or cost-to-complete, and who orders the inspection.
Align the builder’s milestone definitions with the lender’s draw definitions, in writing.
Confirm whether the contract price includes or excludes GST at 5%.
Confirm warranty enrolment is in place before permit application.
Confirm how the 10% holdback is funded and when it releases.
Hold contingency in cash, separate from your down payment.
Model the carrying cost of your current home across the full 12–24 month build, not a 90-day bridge.

Segun Akinrolabu founded Arkadian Homes after a career spanning Banking and Petroleum Geology at Royal Dutch Shell, followed by Real Estate Development. That combination is why financing sequencing is treated here as a construction discipline rather than a paperwork exercise — and why the relationship with our clients extends well beyond the warranty period.

Frequently asked questions

How does a construction mortgage pay out in Calgary?

A construction mortgage advances funds in three to four progress draws tied to inspected milestones — typically foundation and framing, lock-up, drywall and interior, and completion. Each draw is released only after a lender-ordered appraiser verifies percentage of completion on site. Funds are advanced for work already finished, never in advance (WOWA, 2026).

How much cash do I need up front to build a custom home in Calgary?

Plan for roughly 25% of total project cost. Lenders finance up to 75% of a project’s total value and advance only 65%–75% of land value, so the lot down payment is 25%–35% (WOWA, 2026). On a $2.5M project that is approximately $635,000 in equity, plus construction interest and a 15%–20% contingency held separately in cash.

How much are construction draw inspection fees in Alberta?

Each progress draw requires a third-party inspection by an AIC-designated appraiser or an inspection network such as Solidifi or NAS, costing $200–$350 per visit. The borrower pays, and many lenders deduct the fee directly from the draw. A four-draw build therefore carries roughly $800–$1,400 in inspection cost.

What is the 10% builders’ lien holdback in Alberta?

Alberta’s Prompt Payment and Construction Lien Act requires a 10% major lien fund holdback on the value of work done or materials furnished. Liens must generally be registered within 60 days of completion or abandonment of the contract, extended to 90 days where concrete is furnished or for oil and gas well site improvements. Holdback releases after that period expires.

Do I pay GST on a luxury custom home build in Calgary?

Yes — GST applies at 5% on construction cost, and no rebate is available at luxury price points. The original GST New Housing Rebate phases out entirely at $450,000. The 2026 First-Time Home Buyers’ GST/HST Rebate provides up to $50,000 on homes valued to $1,000,000, phasing out between $1,000,000 and $1,500,000 and eliminated at $1,500,000 and above (Canada Revenue Agency, 2026).

Are cost overruns and change orders covered by my construction mortgage?

Generally no. The facility is sized against the approved drawings, specifications, and appraised completed value, so mid-build changes are funded from your own cash in the month they occur. Lenders commonly recommend a 15%–20% contingency above the contract price, held liquid and separate from your down payment.

What is the difference between a construction mortgage and a completion mortgage?

A completion mortgage is builder-financed: the builder carries construction cost and you pay once, at possession, from a conventional mortgage — the model for quick-possession homes. A construction mortgage is self-financed: you carry the build and the lender reimburses you in arrears through progress draws, with interest-only payments on funds drawn to date.

Ready to get started? Book a discovery call or call +1 (403) 259-0209.