Phuket villa renovation: when you need a building permit

Renovating a villa in Phuket does not always need a building permit. Under the Building Control Act B.E. 2522, building, altering or moving a building needs a permit from the local official, or a notification under section 39 bis — but repairs that keep the villa as it was do not. Small changes can also be exempt, only when every condition of a 1985 ministerial regulation is met together. If the land under the villa belongs to someone else, as it does on most leasehold, superficies and usufruct arrangements, the permit application may also need the landowner's written consent — check the exact requirement with the local administration before you apply — and the right you hold determines what you can change without asking at all.

In short

• Repairs that keep the villa as it was need no permit.
• An extension, a structural change or moving the building needs a permit or a notification.
• The exemption for small works applies only when every condition is met together, not just one of them.
• On land you don't own, the application may need the landowner's written consent — confirm this with the local administration before you apply.
• Phuket's coastal zone adds further rules on top of the ordinary permit rules.

Which works need a permit and which don't

Thai building law draws a line between repair and alteration. Repair work that keeps the villa in its existing form sits outside the Building Control Act's permit requirement. But new tiles, plumbing or wiring that add weight or load to the structure can take the work outside that exemption, so each change needs checking against the part of the structure it touches, not just against its own appearance. Building a new structure, extending the villa, or moving it is a different matter: that needs either a permit from the local official or a notification under section 39 bis of the Act — a defined set of plans and documents certified by licensed professionals, filed instead of waiting for approval, for the categories of work the Act allows this way. Whether your project qualifies for the notification route is worth confirming with the local administration before you rely on it.

Between those two ends sits a narrower exception. A 1985 ministerial regulation, as Thai building guides summarise it, exempts small works from the permit requirement, but only when every one of its conditions applies at the same time:

• non-structural work that adds no more than 10% to the load already carried by any part of the existing structure;
• a change to a floor or the roof of no more than 5 square metres in total, with no columns or beams added or removed;
• replacing a structural part with the same material, size, number and type of elements, except where that part is reinforced or prestressed concrete or steel — and only once the local authority confirms the exemption applies.

Meet only one of these and not the others, and the exemption does not apply. We treat this list as a starting point for a conversation with the local authority, not as a free pass to build first and ask later.

Work	Permit, notification or exempt	Condition
Repairs that keep the villa as it was	Not needed	Building Control Act B.E. 2522
Small non-structural work, adding no more than 10% to the load on any part of the existing structure	Exempt	Only together with the other conditions below
Floor or roof change up to 5 sq m, no columns or beams touched	Exempt	Same regulation, same condition
Like-for-like replacement of structural parts	Exempt, except reinforced/prestressed concrete and steel	Same regulation
Extension, new structure, moving the building	Permit, or notification under s. 39 bis	Local official's process
Removing or adding a load-bearing wall	Permit or notification	Treated as a structural change
A swimming pool	Check with the local administration	Requirements depend on the specific project and plot

Who issues permits in Phuket

The Building Control Act puts the decision with the local official — in practice, the municipality or tambon administration where the villa stands. The notification route under section 39 bis runs through the same office, as an alternative to waiting for a permit for the kinds of work the Act lets you notify instead. The document list and the actual processing time for a specific application should be confirmed with the administration where the house stands. Before any work starts, we check the current requirements there, rather than relying on a generic checklist.

A house on leased land: the landowner's consent

Foreign ownership of land in Thailand is generally restricted, with limited statutory exceptions (Land Code, sections 86 and 96 bis). Buying a villa on a leasehold — a lease of the land registered at the Land Department for up to 30 years (Civil and Commercial Code, section 540) — is the ordinary way foreigners buy a villa here, alongside superficies over the building and a usufruct. Which of these you hold decides what you can change in the house without asking the landowner first.

What you hold	What you can do on your own	What needs the landowner
Leasehold (lease of the land)	Day-to-day repairs that keep the villa as it was	Any alteration or extension needs the lessor's prior permission; without it, the lessor can demand that you restore the property and pay damages (CCC s. 558)
Superficies (you own the building)	You own the structure and may remove it when the right ends, restoring the land	If the landowner objects to removing the building and offers to buy it at market price, you cannot refuse without reasonable grounds (CCC s. 1416); the lease or superficies contract should state whether altering your own building needs the landowner's consent
Usufruct	Ordinary upkeep and minor repairs	You must not change the substance of the property, and you must notify the owner immediately once a major repair is needed (CCC s. 1424)
Condominium, for comparison	Changes inside your own unit that don't touch common property or the building's outside — check the condo's own house rules too	Work affecting the common property or the building's outside needs a resolution of the general meeting (Condominium Act, s. 48(3))

Take a hypothetical example: the owner of a leasehold villa wants to add a covered terrace. The lease says nothing about alterations, so before any contractor is booked, our lawyers would read the lease for a consent clause and check whether the superficies, if there is one, covers the new structure. We recommend getting the landowner's written consent in any case, even when the contract doesn't require it — it is far easier to ask before the work than to argue about it afterward.

Coastal zones and height limits

A villa near the coast in Phuket can face rules beyond the ordinary permit process. Measures approved for Phuket in 2023 add a setback from the shoreline, together with a Ministry of Natural Resources and Environment notification that can apply to coastal construction. The exact setback and boundaries depend on the gazetted text and the zone for the specific plot, which is why we check whether a plot falls under these restrictions before confirming what renovation work is allowed on it.

What happens if you build without a permit

Building, altering or moving a structure without the required permit or notification is an offence under the Building Control Act: up to three months in prison and/or a fine of up to THB 60,000, with a further fine of up to THB 10,000 for each day the violation continues (Building Control Act B.E. 2522, s. 65). That is a separate matter from any claim the landowner may bring under the lease or superficies contract for an unauthorised alteration.

What to do next

Before you book a contractor, send us the contract that gives you rights over the land — lease, superficies or usufruct — together with a description of the planned work. We will tell you what the contract says about alterations, whether the landowner's consent is needed, and what to check with the local administration before you apply. An initial assessment of a purchase or booking contract is free and takes up to 48 hours; a fuller consultation on a renovation plan is a separate, paid service, priced once we know the scope of the work. If you're buying the villa and want the lease checked at the same time, our property lawyers in Phuket can look at both together.

For the purchase itself, see how a leasehold villa purchase works in Phuket and how it compares with freehold and leasehold in Thailand. For the land underneath, Thai land title deeds explains what a chanote and the other title documents show. If you're still choosing a property, our due-diligence check looks at the title and the contract before you pay a deposit. For what happens to a lease once the first 30 years end, see the leasehold rewritten after a Supreme Court ruling.