Fixed-Price 

vs. 

Cost-Plus 

Contracts: 

Surrey 

Custom 

Home 

Guide 

Most homeowners come into a contract conversation with a preference already formed. Fixed-price sounds safe. Cost-plus sounds flexible. Both instincts are understandable, but neither tells the full story when you are planning a custom home in Surrey, South Surrey, or Langley.

What does it cost to build a custom home in Surrey in 2026?

Based on projects priced and completed by Square One Construction between January 2024 and May 2026, the ranges generally fall as follows:

• Entry custom homes: $400-$500 per sq ft
• Mid-range custom homes: $500-$650 per sq ft
• High-end custom homes: $650-$850 per sq ft
• Complex or luxury builds: $850-$1,200+ per sq ft

These ranges vary significantly based on site conditions, municipality, and level of finish.

Which contract type you sign affects how well those numbers hold throughout construction - and that question is worth understanding before you commit to anything.

Why Cost-Per-Square-Foot Thinking Misses the Point

A per-square-foot number is useful for a rough orientation. As a budget foundation, it creates problems.

Two homes with identical square footage - one in Morgan Creek, one in Grandview Heights - can carry meaningfully different cost structures based on site conditions alone, before design complexity or finish level enters the conversation. The number on a competitor's website or in a general article was not built on your site, with your design, under your municipality's current requirements.

The contract structure you sign determines how much of that uncertainty you carry - and how much your builder carries.

How Fixed-Price Contracts Actually Work in BC

A fixed-price contract sets a defined scope and a defined number. Your builder takes on the risk that their costs come in as estimated. You take on the risk that the scope description actually covers what you want to build.

That second risk is where most surprises occur. Fixed-price contracts almost always include an allowance schedule - line items for finishes, fixtures, appliances, and materials where the actual selections have not yet been made. A nominally fixed price with undervalued allowances offers limited protection in practice. If the allowances are set at $15,000 for flooring in a home where your selections run $35,000, the gap arrives as a change order.

Walk through every allowance line before signing. Ask what the builder's assumption was and whether it reflects the finish level you actually intend.

What Cost-Plus Exposes You To - and What It Doesn't

A cost-plus contract means you pay actual costs as they occur, plus a builder fee. Your builder carries less financial risk. You carry more.

The trade-off is that the final number is unknown at the start. That uncertainty carries practical consequences - mortgage draw schedules assume predictable milestone payments, and a variable cost base can create friction with lenders. Under cost-plus, you also need to track invoices and markups carefully as the project progresses.

That said, cost-plus can suit complex projects well. If the scope involves significant unknowns - a difficult site, heritage-era structure, or a design that is still evolving - a cost-plus structure may produce a more honest starting number than a fixed price built on assumptions. A fixed-price quote on an incompletely defined scope is a number, not a commitment.

Understanding the BC Builders Lien Act Holdback

Regardless of contract type, BC law requires you to hold back a portion of each progress payment to your general contractor throughout the build. This holdback exists to protect subtrades and suppliers from non-payment and creates a fund available for lien claims.

Under a fixed-price contract, the holdback dollar amount is relatively predictable. Under cost-plus, costs accumulate as the project progresses, which means the holdback pool grows alongside them - a cash-flow dimension that surprises some homeowners who did not plan for it.

Confirm with your lawyer that you understand the release timeline before your first payment is made.

The Warranty Question Every Surrey Homeowner Should Ask First

Before the contract type matters, the builder's licence status matters more. Under the BC Homeowner Protection Act, any builder constructing a new home in BC must hold a residential builder licence and arrange mandatory third-party home warranty insurance - the two-year, five-year, and ten-year coverage administered through BC Housing and regulated by the BC Financial Services Authority.

This warranty is backed by a regulated third-party insurer, not the builder's word alone. Coverage survives even if the builder ceases operations. Ask for proof of licence and warranty enrollment before you sign anything, regardless of whether the contract is fixed-price or cost-plus. A licensed builder produces this without hesitation.

What to Confirm Before Signing Either Contract

Before committing to a contract structure, a few specific items deserve direct answers from your builder:

• Has the site been assessed for soil, drainage, and access conditions that could affect cost?
• Are the allowances based on the finish level you have described, or a generic placeholder?
• Does a cost-plus proposal include a realistic budget estimate, or only a fee structure?
• Is the contract price inclusive of energy compliance costs - including Step Code energy modelling and mid-construction blower-door testing? Surrey and Langley Township each require specific Step Code compliance levels with their permit applications, as of current municipal requirements. Confirm the applicable step level directly with your permit application, as adoption schedules are updated periodically.
• Ask for proof of residential builder licence and warranty enrollment. A licensed builder produces this without hesitation.

Square One Construction reviews site conditions, municipal requirements, and allowance schedules as part of pre-construction scoping - because a compliance gap or an undervalued allowance discovered after design is finalized becomes an expensive correction.

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If you are planning a custom home in Surrey, the first step is scoping - not pricing.

Square One Construction works with homeowners who want clarity around budget, site conditions, and design before moving into construction. This process is best suited for clients looking to build at a high level and avoid costly changes later in the project.

Talk to the Square One team