There is no evidence-backed single square-metre rate or standard total for every Bay of Plenty custom home. The reliable figure is the price for a defined site, design, specification, and scope, with the assumptions and exclusions stated.
Use this guide to build a complete pricing brief. Treat online ranges or calculator outputs as prompts for questions, not as a quote or a promise of final cost.
What determines the project cost?
| Area | Information that affects pricing |
|---|---|
| Site | Access, levels, ground conditions, retaining, drainage, hazards, and services. |
| Design | Floor area, shape, levels, spans, roof form, glazing, and structural complexity. |
| Specification | Cladding, windows, joinery, fixtures, finishes, services, and performance requirements. |
| Approvals | Planning, building consent, engineering, survey, inspections, and authority charges. |
| External works | Driveways, landscaping, fencing, decks, service connections, and owner-supplied work. |
| Commercial terms | Allowances, provisional sums, exclusions, payment terms, variations, and escalation clauses. |
Why a square-metre rate is not a quote
Two homes with the same floor area can have different costs because of their structure, roof, glazing, services, site, finish level, and external work. A rate may also exclude professional fees, consent costs, earthworks, landscaping, utility connections, or owner-supplied items.
If a rate is discussed, ask what drawings, specification, inclusions, exclusions, site assumptions, and tax basis it uses. Do not compare rates that describe different scopes.
Separate the house price from the total project budget
A complete budget may need to account for:
- land and finance costs;
- survey, geotechnical, architectural, engineering, and other consultant services;
- consent, authority, and inspection charges;
- earthworks, retaining, drainage, access, and service connections;
- the building contract and stated allowances;
- landscaping, driveways, fencing, window treatments, and furniture;
- temporary accommodation, storage, insurance, and holding costs where applicable;
- a risk allowance chosen with the relevant financial and project advisers.
Make allowances and exclusions visible
A lower total may contain smaller allowances or more excluded work. Ask for a schedule that identifies each allowance, the quantity and quality assumed, what happens if the selection differs, and whether margin or administration charges apply to changes.
Confirm the variation process before signing. A fixed-price label does not remove changes requested by the owner, concealed conditions, or other matters treated separately by the contract.
Investigate the site before relying on a price
Appropriate site information can include title and easement review, survey, geotechnical investigation, planning constraints, hazard information, levels, access, services, stormwater, wastewater, and retaining requirements.
Record what has been investigated and what remains an assumption. Ask how unresolved site information would affect price and programme.
Compare proposals on the same basis
- Use the same drawing revision and specification.
- Normalise inclusions, exclusions, allowances, provisional sums, and owner-supplied items.
- Check the legal entity, tax basis, insurance, qualifications, guarantee documents, and payment schedule.
- Confirm the defects, variations, delay, suspension, termination, and dispute provisions.
- Ask an appropriately qualified adviser to review the contract where needed.
Cost and programme need to be read together
Design, consent, procurement, site work, construction, inspections, and handover each have dependencies. Holding and accommodation costs may continue while those stages progress. Ask for a project-specific programme and the assumptions behind it rather than relying on a generic regional duration.
What Diack Homes publishes
Diack Homes' FAQs describe detailed specifications, fixed-price contracts, documented costs, and clear payment schedules. Its Gold Standard Promisedescribes communication and quality checks. Confirm the actual contract definition, scope, assumptions, allowances, exclusions, payment terms, and variation process for the proposed build.
The published core pages also state that BuilderTrend is used for regular progress updates, photos, and documentation. Confirm the project-specific platform features, payment records, and other records that will be provided.
Frequently asked questions
What is the cost per square metre?
No single figure is reliable without a defined site, design, specification, inclusions, and exclusions.
Can an estimate tool provide a quote?
No. Use any calculator output only as an early prompt; a quote requires project-specific information and written terms.
Does fixed price mean the total can never change?
No. Read the contract treatment of allowances, variations, owner changes, concealed conditions, and other exclusions.
What should be included in the budget?
Include the complete property and project scope, not only the building contract. Confirm each cost category with the relevant provider.
How should I compare builders?
Compare equivalent documents and scope, then review qualifications, contracts, references, communication records, and project fit.
Request project-specific information
Diack Homes publishes coverage across Tauranga, Mount Maunganui, Papamoa, Te Puna, Te Puke, and the wider Bay of Plenty. Confirm availability for the site, then book a free building consultation to discuss the information needed for a proposal.