Custom home builders can charge a fixed price for a defined scope, actual construction costs plus an agreed fee, or a combination of the two. The payment schedule is a separate issue: it determines when money is due, not necessarily how the final price is calculated. Compare the scope, fee rules, allowances and exclusions before comparing totals.
For a Niagara new home, there is no responsible universal builder-fee percentage or square-foot price that can replace a project-specific proposal. Site conditions, specifications and the allocation of responsibilities must be known first.
Fixed price: what is fixed?
A fixed-price agreement sets a price for the work described in its contract documents. It is most useful when the design and specification are developed enough for the parties to understand that scope.
Ask which drawings and revisions form the basis of the price. Then identify allowances, exclusions and circumstances that permit an adjustment. A fixed total on the cover does not explain how a later owner change, an unresolved selection or a contract-defined unforeseen condition will be handled.
Before accepting the proposal, ask the builder to price your important selections rather than leaving them all at provisional amounts. More certainty in the scope makes the price more meaningful.
Cost plus: define the costs and the “plus”
The Canadian Construction Documents Committee describes cost-plus contracting as actual costs plus a percentage or fixed fee. The practical questions are which costs qualify, how they are documented and what services the fee includes.
- Does the fee apply to labour, materials, subcontractors, equipment or other categories?
- How are the builder’s own labour and site supervision charged?
- Are delivery, waste, temporary facilities and administration separate costs?
- What invoices, time records and cost reports will the owner receive?
- How are credits, supplier discounts, changes and forecast overruns handled?
A budget forecast is not automatically a guaranteed maximum. If a cap is proposed, have its definition and exceptions reviewed. The CCDC’s cost-plus contract overview highlights the importance of reimbursable costs, fee basis, cash flow and cost reporting.
Hybrid proposals need equally clear boundaries
A proposal may combine a fixed construction package with selected allowances, or charge separately for pre-construction work before a construction price is agreed. Ask where one arrangement ends and the next begins.
Confirm the deliverables from a paid planning stage, whether any fee is credited later, and what happens if you do not proceed to construction. Do not assume you own or can reuse every drawing simply because you paid a planning invoice; clarify document-use rights in the agreement.
Allowances are placeholders, not extra spending money
For each allowance, identify the quantity and specification assumed and whether it includes supply, installation, delivery, taxes and the builder’s fee. Keep a selection log showing the allowance, chosen item and approved adjustment.
Hypothetical calculation only: Suppose an agreement has a $5,000 CAD supply allowance and the selected product costs $6,500 CAD on the same tax basis. The supply difference is $1,500. That is not necessarily the complete change: installation, delivery, applicable taxes or a contractually agreed fee may also change. These figures illustrate the method, not product pricing or an HBA quote.
Request one written change showing the full adjustment and schedule effect before ordering. A retailer’s upgrade price may cover only the product.
Separate the builder’s price from the project budget
Check whether the proposal includes design, engineering, surveys, site preparation, servicing, permits, applicable development charges, demolition, landscaping and owner-supplied items. Record what is excluded and who is obtaining its price. Confirm the treatment of HST explicitly rather than assuming a quoted figure includes it.
For the wider sequence, our custom home building guide explains when these decisions belong. The financing guide addresses cash availability rather than construction pricing.
Review payment obligations before signing
Ask what evidence supports each progress invoice and how it aligns with lender draws. Have a construction lawyer explain applicable payment, holdback, lien and dispute requirements; do not treat an informal agreement to “pay the rest at the end” as a complete legal plan.
The HCRA hiring guide recommends reviewing these construction-related issues with a lawyer. Compare proposals only after the responsibilities and commercial terms are clear.
To discuss your Niagara project, contact Homes By Adam with the available drawings, selections and site information. Ask which pricing approach is being proposed and what is needed to make the scope more definite.
Prepared by Homes By Adam.
