A property inspection answers a narrow but important question: what is the physical condition of this particular unit, house, villa, and included equipment on the inspection date? It should turn observations into evidence that can be used for price negotiation, contract conditions, snagging, reinspection, and handover.
It does not decide title, ownership eligibility, permit validity, EIA compliance, market value, or legal remedies. Run those workstreams separately and reconcile them before accepting the property or releasing money.
What does a technical inspection cover, and what remains separate?
| Workstream | Main question | Typical output |
|---|---|---|
| Technical inspection | What visible defects and system failures exist now? | Dated report, tests, photographs, measurements, snag list |
| [[due-diligence-checklist-thailand | Legal due diligence]] | Can the seller transfer the promised legal asset, and what approvals or liabilities affect it? |
| Permit and EIA review | Does the official record cover the project and relevant work? | Verified approvals, plans, conditions, gaps |
| Valuation | What is the property worth in its market and condition? | Valuation with assumptions and comparables |
| Warranty or defect claim | Who must repair, pay, or accept delay under the contract and law? | Legal position, notice, negotiated or adjudicated remedy |
An EIA, building permit, developer quality-control sheet, warranty, valuation, or agent walkthrough may be useful evidence. None certifies every concealed or later defect in the buyer’s property. Conversely, a visual inspection cannot prove that a wall, extension, or pool was lawfully approved.
When should resale, completed-new, and off-plan buyers inspect?
Resale: inspect before the SPA becomes unconditional, or make satisfactory inspection an express condition. Record age, maintenance, alterations, leaks, pest evidence, equipment operation, and the exact furniture inventory. Resales may be sold as seen or “as is”; the contract decides what the seller must correct.
Completed developer stock: inspect the exact finished property before acceptance and final payment. Compare it with the SPA, approved variations, plans, specification schedule, show-unit promises preserved in writing, and inventory. A completed show unit is not evidence that the purchased unit matches.
Off-plan handover: agree the inspection right and access process in the SPA, then inspect after systems can operate but early enough for recorded corrections and reinspection. Link the snag list to the contractual acceptance and payment mechanism in the purchase agreement, not to an informal promise.
A second visit after heavy rain can reveal drainage and water-entry patterns that a dry-day inspection cannot. It is supplementary, not a universal requirement.
How should the buyer define the inspection brief?
Get a written scope before appointing anyone. It should identify:
- the exact unit, land structures, pool, outbuildings, common interfaces, furniture, and appliances included;
- whether the inspection is visual only or includes moisture readings, electrical tests, water-pressure tests, drainage flow, thermal imaging, roof or crawl-space access, pool equipment, and air-conditioning performance;
- excluded, inaccessible, concealed, switched-off, unfinished, or unsafe areas;
- who provides access, power, water, drainage, keys, ladders, permits, and safe isolation;
- the inspector’s relevant discipline, licence where controlled engineering work is involved, insurance, conflicts, report format, and reinspection terms;
- the reference documents and tolerances: contract specification, drawings, manufacturer instructions, or a named standard where legitimately applicable.
Verify a claimed Thai engineering licence through the Council of Engineers. Do not ask a general inspector to open live equipment, certify structure, diagnose termites, or test a pool outside their competence; escalate to the relevant engineer, electrician, pest specialist, or pool technician.
What documents should be ready before the inspection?
The inspection is stronger when the physical asset can be compared with a written baseline.
- SPA, reservation terms, inspection and acceptance clauses, warranty, and notice addresses.
- Unit or building plans, room schedule, material and fixture specifications, approved variations, and developer snagging form.
- Inventory of furniture, appliances, keys, remotes, access cards, parking and storage.
- Available building permits, approved plans, EIA record where applicable, and alteration approvals — for buyer counsel to verify separately.
- Manuals, commissioning sheets, service history, repair invoices, pest treatment, waterproofing or roof records, and equipment warranties.
- For a condo resale, relevant juristic-person rules, recent notices about leaks or major works, and records for defects crossing the unit/common-property boundary.
If documents are missing, list the gap. Do not silently convert “not provided” into “compliant.”
What should the physical inspection checklist include?
Which structural and movement signs need escalation?
Record cracks with location, direction, width where safely measurable, and whether they cross structural-looking elements, repeat through finishes, or accompany distortion. Check visibly uneven floors, sticking doors, separated joints, corrosion, spalling, exposed reinforcement, retaining walls, slopes, and settlement around drains or pools.
A crack photograph is not a structural diagnosis. Rapid, wide, repeating, displaced, or water-associated movement, or concern about a load-bearing element, needs a qualified structural engineer and possibly monitoring or opening-up.
How should roofs, waterproofing, moisture, and drainage be checked?
Look for staining, efflorescence, mould, swollen joinery, peeling coatings, failed sealant, ponding, blocked outlets, poor falls, damaged roof coverings, flashing gaps, wet service shafts, and leakage around windows, balconies, bathrooms, kitchens, tanks, and pools. Record moisture-meter readings as comparative evidence, not proof of the hidden cause.
Run accessible taps and showers, observe traps and drains, and check exterior discharge without flooding finishes. Roofs, façades, concealed membranes, and high areas may require specialist access and cannot be cleared merely because no stain appeared during a short dry inspection.
What electrical items should be tested safely?
Confirm the utility supply and meter identity; check whether distribution-board circuits are labelled; inspect accessible covers, socket condition, obvious overheating, exposed conductors, wet-area fittings, outdoor protection, earthing evidence, and residual-current device (RCD) protection. Test lights, switches, accessible sockets, isolators, alarms, and the RCD test function only within a competent person’s safe method.
Thailand’s Provincial Electricity Authority advises residential RCD protection of no more than 30 mA, installed with earthing by a skilled technician, and regular testing. That public guidance does not replace a design-specific electrical assessment. Live-board work, insulation resistance, earth continuity, polarity, or load testing belongs to a competent electrician or electrical engineer.
What plumbing and water checks matter?
Test hot and cold flow, pressure consistency, shut-off valves, visible joints, fixtures, toilets, pumps, tanks, water heaters, filters, and drainage. Look for leaks during and after use, slow discharge, odours, backflow signs, noisy pumps, corrosion, and water damage below fixtures. Confirm the water source, meter, deposits, and septic or treatment arrangements for villas where relevant.
How should air conditioning and ventilation be checked?
Operate every included unit long enough to observe cooling, controls, noise, vibration, condensate drainage, odour, and visible coil or filter condition. Check bathroom and kitchen extract paths where accessible. A brief temperature reading does not establish refrigerant charge, duct condition, capacity, or remaining life; escalate weak or abnormal equipment to an HVAC technician.
What should be checked for pools, pests, finishes, and inventory?
- Pool and plant: water loss clues, shell or tile defects, coping, drains, lights, pump, filter, valves, chemical equipment, electrical isolation, equipment labels, noise, and service records. Use specialists for leakage or electrical diagnosis.
- Pests: mud tubes, frass, hollow or damaged timber, nests, droppings, entry gaps, and treatment records. Visible absence is not a termite clearance.
- Finishes: floors, walls, ceilings, tiles, grout, paint, cabinets, sanitaryware, sealants, glass, rails, stairs, and alignment. Tap testing or adhesion assessment should follow the agreed non-damaging method.
- Doors and windows: operation, locks, seals, drainage holes, safety glazing markings where relevant, screens, thresholds, and water-entry evidence.
- Appliances and safety: run included appliances safely; record model and serial numbers; check smoke or heat alarms, extinguishers, escape paths, guards and handrails against the agreed scope.
- Utilities and meters: photograph electricity and water readings, meter numbers, tank levels where relevant, internet equipment, solar or generator systems, and outstanding service faults.
How is a condominium unit inspection different?
The buyer normally inspects the unit and accessible dedicated equipment. Façade, roof, structure, lifts, main risers, common drainage, fire systems, pools, corridors, and plant may be common property controlled by the condominium juristic person.
Do three things:
- Identify whether each symptom originates in the unit, common property, another unit, or remains unknown.
- Ask for relevant incident, repair, leak, insurance, maintenance, and planned-work records from the juristic person, subject to lawful access and availability.
- Put both the seller and the appropriate management contact on notice when responsibility is uncertain; do not let the parties close an item merely by pointing at each other.
The Condominium Act framework and registered regulations govern common-property management. Technical inspection does not replace checking juristic-person registration, rules, accounts, debt certificate, meeting minutes, insurance, and planned assessments through due diligence.
How should defects be documented and ranked?
Use a simple working scale, clearly described as project triage rather than a legal classification:
- A — safety or urgent investigation: electric-shock, fire, instability, major active leak, unsafe guarding, sewage, or another condition requiring isolation, specialist assessment, or immediate control.
- B — material performance or contract issue: water entry, failed system, repeated movement, missing specified item, unusable room or equipment, or defect likely to worsen.
- C — minor finish or adjustment: cosmetic damage, alignment, sealant, touch-up, hardware adjustment, or incomplete cleaning.
For every item record: ID, room and exact position, observation, reference requirement if any, photograph, measurement/test, severity and rationale, requested action, responsible party, date raised, target date, response, evidence of repair, reinspection result, and closed-by/date. Keep original files and export a dated, read-only PDF or spreadsheet snapshot for each issue round.
Severity does not determine the remedy. The SPA, applicable law, evidence, and written agreement decide whether the outcome is repair, replacement, credit, retention, delay, acceptance with reservation, or rejection.
What are the three practical inspection workflows?
Resale workflow
- Make access and satisfactory inspection a written precondition before commitment where possible.
- Inspect with utilities operating; compare the property with the inventory and seller disclosures.
- Obtain specialist follow-up and repair estimates for material uncertainty.
- Put the agreed repair, price adjustment, retention, or accepted condition into the SPA.
- Recheck condition, inventory, meters, keys, and new damage immediately before handover.
Completed-new workflow
- Collect specifications, approved variations, inventory, warranty, and acceptance form.
- Inspect the exact property and record snags before signing acceptance or releasing the contractually linked balance.
- Agree owners, dates, access, reinspection, and treatment of unresolved items in writing.
- Reinspect repairs; do not close concealed work on a photograph alone when a functional test is needed.
- Sign a handover record listing both closed and open items.
Off-plan handover workflow
- Before signing, negotiate inspection access, notice, completion standard, snag process, warranty, reinspection, payment linkage, and unresolved-defect consequences in the SPA.
- During construction, keep approved changes and milestone evidence; progress visits do not replace final inspection.
- Inspect when services and equipment are commissioned and the property can be tested.
- Issue the snag list through the contract’s notice channel and within its stated time limits.
- Reinspect, preserve open items, and coordinate acceptance, payment, and transfer day with buyer counsel.
What belongs in the signed handover record?
- Property, parties, date and time, attendees, and the documents used.
- Condition statement with explicit reservations and attached open-snag schedule.
- Furniture and appliance inventory, model/serial numbers, and visible condition.
- Counts for keys, access cards, remotes, parking tags, mailbox and storage access.
- Electricity and water meter numbers/readings, utility accounts, deposits, and transfer steps.
- Manuals, warranties, receipts, commissioning sheets, approved variations, and available as-built drawings.
- Service contacts, passwords or account-transfer method for included smart systems, and maintenance history.
- Who owns each open action, target date, access arrangement, reinspection, and what the contract says happens next.
Do not sign wording that says the property is fully satisfactory if the attached record shows unresolved material defects, unless buyer counsel has explained the consequence and the reservation is explicit.
Which red flags should stop acceptance or trigger specialist advice?
- Unsafe exposed electrical work, repeated breaker trips, burning smell, missing wet-area protection, or signs of overheating.
- Active water entry, widespread moisture, sewage odour/backflow, persistent ponding, or mould with no verified cause.
- Displaced or recurring cracks, corrosion/spalling, distorted openings, retaining-wall movement, or ground settlement.
- Seller or developer refuses utilities, access, photographs, measurements, independent attendance, or reinspection.
- The property, plans, specifications, inventory, meter identity, or serial numbers do not match the contract.
- Pressure to sign an unconditional acceptance or pay first while defects and documents remain “to be sorted later.”
- A condo defect crosses into common property but neither seller nor juristic person will acknowledge or investigate it.
- Repairs hide evidence without a cause, method, completion record, or functional retest.
Who is this guide for, and who needs a different service?
It is for buyers organizing a pre-purchase or pre-handover condition review of a Thai condo, house, or villa. It is not remote diagnosis, a statutory building inspection, a structural certificate, a pest clearance, an electrical compliance certificate, a valuation, or legal advice. Complex or unsafe findings need the relevant qualified specialist; title, permits, EIA, acceptance rights, deadlines, warranties, retention, and remedies need buyer counsel.
Use this guide alongside the buyer-mistakes map, the off-plan risk guide, and the full buying sequence.