D-Value: how to check a Koh Phangan property's official government appraised value online

Can you check a specific Koh Phangan plot's official government appraised value yourself, without a lawyer or a trip to the Land Office? Since June 2026, yes — the Treasury Department's D-Value service issues a certified digital copy of a property's appraisal account free of charge, verified by ThaiD or Paotang, delivered by email in around 10 minutes, available around the clock.

What D-Value actually gives you

D-Value is an extension of the Treasury Department's existing property valuation system, covering both land plots and condominium units nationwide. The output is an official, electronically signed certificate of the appraised value the government has on file for that specific parcel or unit — the same figure the Land Office uses as the tax base for transfer fees, mortgage registration and Specific Business Tax, and that the local administrator uses for annual Land and Building Tax. It is not an independent market valuation; it's a certified copy of the government's own record.

How to access it

• Where: the Treasury Department's e-Property Valuation portal (treasury.go.th) or the TRD Property Valuation mobile app, iOS and Android.
• Identity verification: required through ThaiD or Paotang, Thailand's government digital-ID apps.
• Finding the parcel: search by satellite map, place name, street or nearby landmark and select the parcel directly on the map — you don't need to already know the chanote or Nor Sor 3 Gor number, which matters if you're checking a plot before you've seen the paperwork.
• Cost and speed: free, with the certified copy emailed in about 10 minutes.

Where it's actually useful on Koh Phangan

• Sanity-checking an asking price. The appraised value is not the market price — Treasury appraisals typically run 20–40% below what land actually transacts for, a gap covered in the 2027 valuation reform — but it's a real, official reference point to weigh a seller's number against before you commit to due diligence on a specific plot.
• Loan applications. The certified copy is accepted as supporting documentation by three participating banks: Government Housing Bank (GHB), the Bank for Agriculture and Agricultural Cooperatives (BAAC) and Krungthai Bank. This matters far more for a freehold condo purchase than for a villa or land, since Thai mortgage lending to foreigners for land is effectively closed — see Financing as a foreigner.
• Disputing a Land and Building Tax bill. If an assessment looks inflated, the formal appeal process asks you to compare the notice against the Treasury Department's valuation for the specific parcel — D-Value is now the fastest way to pull that figure yourself before filing. See Disputing your Land and Building Tax bill.
• Getting ahead of the 2027 revaluation. The current 2023–2026 appraisal cycle ends this year; checking today's figure on D-Value gives you a documented baseline to compare against once the new 2027–2030 cycle is published.

The certificate is a genuine time-saver over a Land Office visit, but treat the number it returns for what it is: the government's tax base, not a market appraisal. For an actual purchase, it belongs alongside — not instead of — a lawyer's title search and your own comparison of recent sale prices in the area.