How to Compare Home Builder Quotations in Chiang Mai

How to Compare Home Builder Quotations in Chiang Mai

Two quotations arrive for the same house. One total looks lower, the other includes more pages, and both use material descriptions that sound similar. The difficult question is not simply which price is cheaper, but whether the two builders are pricing the same work. This guide gives Chiang Mai and Lamphun homeowners a practical way to compare scope, assumptions and payment terms before choosing.

This guide is for landowners, expats and cross-cultural families planning a custom home in Chiang Mai or Lamphun. It is practical preparation information, not legal or engineering advice. The final scope, contract and permit documents should be reviewed for the specific project by appropriate professionals.

1. Compare the same design information

Ask every bidder to price from the same current drawing set and written brief. Record the drawing issue date so that an early concept is not compared with a later, more detailed package. Where architecture, structure or building systems are not yet resolved, require the quotation to label assumptions and provisional allowances clearly.

A low figure based on less information may grow after design coordination. A higher-looking quotation may include work that another bidder has left out. The first task is therefore to normalise the scope before comparing totals.

2. Separate included, excluded and provisional work

Read the quotation line by line. Check site preparation, temporary utilities, soil or survey work, foundations, structure, roof, doors and windows, finishes, sanitary ware, electrical work, air-conditioning provisions, built-in furniture, landscape interfaces, drainage, boundary work and utility connections. Do not assume that a familiar item is included if it is not written down.

Provisional sums and owner-supplied items need a clear basis. Ask what quantity or specification has been allowed, who purchases the item, who installs it and how price differences will be handled.

3. Compare specifications, not brand names alone

A product name does not describe the whole installed system. Compare model, grade, size, thickness, colour range, accessories, substrate, installation method and testing where relevant. If substitutions are allowed, the approval process should be written.

For custom homes, the interaction between components often matters as much as the components themselves. Window size affects structure and shading; bathroom finishes affect levels and waterproofing; pool and landscape design affect drainage and maintenance access.

4. Match payments to verifiable work stages

The Office of the Consumer Protection Board advises consumers to examine the work and first-payment conditions carefully, warning that a large first payment can create risk when there is not yet evidence of corresponding work. Review each proposed instalment against a stage that the homeowner and supervising professionals can verify.

Ask what evidence accompanies a payment request: progress records, approved material submittals, inspection notes or photographs. Clarify retention, delay procedures and the process for disputed or incomplete work before signing.

5. Read the contract and change-order rules

OCPB stated in 2026 that residential building construction is subject to contract-control requirements under the relevant 2016 announcement. The contract should be consistent with current law and the agreed scope. Consider independent legal review, especially for a high-value or bilingual contract.

Define how a change is requested, priced, approved and added to the schedule. Verbal changes can produce disputes. A written variation should identify the description, price effect, time effect and approvals before the changed work proceeds whenever practicable.

6. Verify the builder and the proposed project team

OCPB advises consumers to review contractor history, past work and business information before contracting. Ask for relevant completed projects, the proposed site-management structure, professional coordination and a realistic construction programme. Verify claims rather than relying only on social media images.

For your own land, also organise the title document, location map and planning context. The Department of Public Works and Town & Country Planning provides a land-use planning check service; its online lookup is preliminary information and is not a construction permit.

A practical quotation comparison table

• Drawing and specification revision used for pricing
• Total floor area and measurement basis
• Included architectural, structural and system work
• Material models, grades and installation assumptions
• Provisional sums and owner-supplied items
• Site works, utilities and external works
• Taxes, professional fees and permit-related items
• Payment stages and evidence required
• Construction period, delay and extension rules
• Variation, substitution, inspection and handover procedures

Frequently asked questions

Should we choose the lowest price? Not until the scope is normalised. Compare what is included, the quality basis, exclusions, payment risk and contract terms.

Is a price per square metre enough? No. It can be an early planning reference, but it does not replace a project-specific scope and specification.

Can a builder promise that costs will never change? A contract can allocate risk and define change procedures, but unresolved information, owner changes and unforeseen site conditions should be addressed transparently.

Does Greenery provide free house design? No. We offer an initial free architect consultation to review the brief and preparation needs. It does not include free drawings or free architectural design.

Compare transparent scope before committing

Bring the latest drawings, both quotation files and a list of unclear inclusions to your next conversation. You can review our design-and-build process and selected projects, then contact Greenery for a complimentary initial architect consultation. It does not include free drawings, a legal contract review or a promise that one price will never change.

Sources

• Office of the Consumer Protection Board — Consumer guidance on hiring construction contractors (accessed 16 August 2026)
• Office of the Consumer Protection Board — Residential construction and contract-control information (11 May 2026; accessed 16 August 2026)
• Department of Public Works and Town & Country Planning — Land-use planning check service (accessed 16 August 2026)