Commercial Property Due Diligence in Thailand: What to Check Before Signing

Investment 8 min By Nestenn Thailand Research Team Published November 10, 2026

Before committing to an existing commercial property in Thailand, establish three things: what legal right you will receive, whether your exact business can operate at the site, and what it will cost to get the premises ready. Ask for evidence while you still have the option to walk away. A building that is available to lease is not necessarily ready for your use.

This checklist is for operators considering an office, shop, showroom or warehouse, and for investors buying a building with tenants. It starts where an attractive listing or viewing leaves off. For a specialised power-intensive project, see our separate guide to data-centre site selection.

AI-generated editorial image of fictional commercial premises in Thailand. It does not depict a Nestenn listing.

Write down what must happen at the address

Give your adviser an operating brief, not just a floor-area target. A showroom might need weekend customer access and prominent signage. A distributor might need delivery vehicles to turn on site, a specified floor loading and an uninterrupted route to the public road. An office might need cooling outside building hours. Say whether you will store goods, receive visitors, run equipment or alter the premises, and note the date by which you need to open.

Separate requirements that can be priced from ones that can kill the deal. Adding suitable lighting may be manageable. A site that cannot legally accommodate your activity or cannot take the vehicles you rely on may never work for you. Agree on this distinction before paying for detailed surveys or negotiating a lower price.

Confirm who can grant the right you need

Have independent Thai counsel verify the title and relevant registered rights at the competent Land Office. Give them the parcel identifier, site plan and proposed transaction, so the search addresses the space you inspected. Ask about mortgages, registered leases, servitudes and restrictions, and whether a lender release or third-party consent must be delivered at completion. Check the right to use any private road, shared parking area, loading bay or utility route on which the operation depends.

When a company is selling or letting the property, obtain its current registration evidence and check who can sign and what approvals the transaction needs. A Department of Business Development certificate helps identify the entity and its authorised representatives. It does not establish ownership of the building. Where a tenant is offering a sublease, ask counsel to reconcile the sublease with the head lease and verify required consents, expiry and what happens if the head lease ends early.

For a lease, verify exactly what is included, the term, any applicable registration requirement and the parties' ability to register it. Treat a renewal option as a contractual item to review rather than an extra secured term. For an acquisition, ask counsel to confirm eligibility for the proposed ownership structure before committing. The checks depend on the buyer and asset; the fact that a seller holds title does not establish that a particular buyer can acquire it.

Test the intended use against the building file

Start with the applicable planning rules for the parcel. The Department of Public Works and Town and Country Planning offers planning and building-control services through DPT Town Square; Bangkok also has its own planning enquiry channels. Use online maps to screen locations, then ask the competent authority or your specialist to check your activity at that address under the current rules. A district name, zoning colour or draft planning map is not a parcel-specific conclusion.

Compare the available permits and approved plans with the actual layout. An added mezzanine, rear extension, enclosed loading area or new activity could change what must be checked. Ask who will obtain any required approval for alterations, change of use or operation. If environmental assessment may apply, ONEP's Smart EIA Plus can help locate records. A search result, or the absence of one, does not determine the obligations for your proposed operation.

Make the site visit answer operational questions

Walk the delivery route, from the public road to the point where goods will be unloaded. Ask an engineer to check the dimensions, floor condition and capacity against your vehicles and equipment. Observe the site at a time that reflects your working hours. Ask about drainage, past water entry and after-hours access; verify what you can with inspection findings, maintenance records and written operating rules.

Request records for electrical supply, ventilation and fire systems. Confirm with the relevant provider or building manager what capacity is actually available, what an upgrade would require and who pays for it. For alterations, obtain a budget and programme that allow for approvals, lead times, testing and access for contractors. Leave room in the opening schedule for those dependencies instead of assuming works can begin on handover day.

Work through the documents before pricing the risk

Question	Evidence to request	Decision if unresolved
Can we occupy the full area we need?	Title or head lease, signed premises plan, access rights and required consents.	Do not rely on an area or right that is not documented.
Can this activity operate here?	Parcel planning check, approved building plans and applicable operating or works approvals.	Make the commitment conditional on clear evidence.
Can we open on time?	Engineering findings, utility capacity, fit-out scope and realistic completion dates.	Move the opening assumption or reject the site.
Will the income or occupancy budget hold?	Executed leases or cost schedule, receipts, arrears, service charges and repair estimates.	Reprice a measurable cost; pause if reliable records are missing.

Compare the full occupancy cost

If you will occupy the premises, compare the whole commitment: rent or purchase price, deposits, fit-out, charges, utilities, insurance and any end-of-term reinstatement. A refundable deposit ties up cash even if it is not an expense. Ask your accountant which taxes apply to your structure and what cash must be available before opening. A quote that excludes essential works is not comparable with one for a space already equipped for the same activity.

Verify the income you are buying

If you are buying income, tie each rent-roll line to a signed lease and actual payments. Review incentives, side letters, arrears, deposits, break rights, expiries and the cost of space becoming vacant. Verify which amounts transfer at completion and which liabilities remain with the seller. Compare sustainable income with the building's recurring costs and future works, using our net yield and liquidity guide for the investment calculation.

Decide what has to be true before money is at risk

Keep a short issues register. For each gap, record the evidence required, the person who can provide it, the deadline and the consequence if it remains open. Price a repair once the scope is credible. Make missing consent or a critical use approval a condition to be satisfied at the appropriate stage. If the seller or landlord cannot deliver a right the operation depends on, a discount may not solve the problem.

Ask independent counsel to put the agreed conditions, deadlines and deposit treatment into the documents before signing. Establish what happens if evidence arrives late or a condition fails. Keep the final approvals, measured plans and handover records together; the team running the building will need the same information the acquisition team used.

Send Nestenn your operating brief

Start with our commercial property guide or browse the current property catalogue. If you have a candidate address or a search underway, send Nestenn your commercial property brief with the activity, target location, budget, required area, opening date and requirements that cannot change. We can help frame the shortlist and compare the evidence you receive, alongside your independent legal and technical advisers.