Do not start from a contractor quotation alone. First obtain the current building renovation rules, identify every structural, electrical, plumbing, waterproofing and fire-safety impact, confirm whether government approval is required, and make written approval, insurance, protection and inspection conditions part of the contract.
Which building records should be collected first?
- current house and renovation rules;
- unit and common-property plans available to the owner;
- approved working hours and access route;
- contractor registration and insurance requirements;
- renovation deposit and refund process;
- inspection and completion forms.
Read the broader guide to condo living in Thailand before treating the private unit as separate from the building rules.
Which parts of the scope need technical review?
- walls, columns, slabs and penetrations;
- wet areas, waterproofing and drainage;
- electrical load, panels and fixed equipment;
- air-conditioning, ventilation and condensate;
- fire alarms, sprinklers, doors and escape routes;
- balconies, windows, façades and exterior appearance.
Use qualified designers or engineers when the scope affects systems, structure or safety. A contractor's willingness to perform the work does not prove the design is acceptable.
When may government approval be required?
Permit or notification requirements can depend on the building, location and exact alteration. Confirm the current pathway with the responsible building-control authority and qualified Thai professionals before work that changes structure, use, building systems or regulated features.
- record the authority and advice received;
- identify drawings and professional certifications required;
- make approval a condition before construction;
- retain every submission, decision and inspection record.
What should the contractor contract include?
- final drawings, specifications and exclusions;
- price, payment stages and change-order method;
- start, completion and delay terms;
- insurance and responsibility for workers;
- protection of lifts, corridors and other units;
- testing, cleaning, warranties and defect correction.
Match each payment to an observable deliverable. Keep official receipts and contractor invoices in the permanent property file.
How should existing condition be recorded?
- photograph the unit before materials arrive;
- record walls, floors, ceilings and wet areas;
- record lifts, corridors and the delivery route;
- note meter readings and working building systems;
- identify existing damage with the juristic office.
A signed condition record helps separate pre-existing defects from damage caused during the work.
How should access and site control work?
- approved worker list and identification;
- material-delivery and waste-removal procedure;
- lift booking and common-area protection;
- noise, dust and working-hour controls;
- keys, cards and after-hours access;
- daily cleanup and incident reporting.
What should be inspected during the work?
- hidden electrical and plumbing work before closing walls;
- waterproofing before finishes are installed;
- approved fire and life-safety interfaces;
- equipment models and installation locations;
- changes from the approved drawings.
Photograph concealed work and require written approval for material changes rather than accepting an informal site instruction.
What should happen before final payment?
- Inspect the completed work against the approved scope.
- Test electrical, plumbing, drainage and installed equipment.
- Record defects and a correction deadline.
- Obtain building or authority sign-off where required.
- Collect warranties, manuals, drawings and receipts.
- Confirm deposit release and access-card return.
Use the house defect and warranty checklist as a model for the final defect record.
What belongs in the permanent unit file?
- juristic-person and authority approvals;
- final drawings and specifications;
- contractor identity, insurance and contract;
- condition, progress and concealed-work photographs;
- inspection, testing and completion records;
- warranties, receipts and maintenance instructions.
Owners can review the condo juristic records checklist for the wider building file.
Approve the design before construction.
Make written building approval, technical review and inspection conditions of the contractor agreement rather than tasks to solve after demolition.
Find property and renovation supportFrequently asked questions
Does owning a Thai condo allow any renovation inside the unit?
No. Unit ownership does not remove condominium rules, common-property controls, building-safety requirements or permit obligations that may apply to the work.
Should juristic-person approval be obtained before hiring a contractor?
Yes. Obtain the current written renovation procedure, permitted scope, deposit, insurance, access, working-hour and inspection requirements before signing a non-refundable contract.
Can a wall be removed without engineering review?
Do not assume so. Confirm whether the wall, slab, services or fire-safety systems are affected and obtain qualified design and approval where the scope requires it.
Who is responsible for damage to common property or another unit?
Responsibility depends on the facts and contracts. The owner should require contractor insurance, condition records, protection measures and a written damage-response process before work begins.
What should be kept after the renovation?
Keep approvals, drawings, specifications, contractor records, insurance, deposits, inspection results, warranties, receipts and final photographs with the permanent unit file.
Sources & References
- Department of Lands
- Department of Public Works and Town & Country Planning
- Office of the Consumer Protection Board
- Royal Thai Government Gazette
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.
