Can a bank mortgage on the land outrank your registered lease or superficies?

Does your registered leasehold-plus-superficies survive if the landowner's bank forecloses on the land underneath it? It depends entirely on timing. A registered lease generally survives an ordinary sale — the new owner simply steps into the old landowner's position. A mortgage foreclosure is a different, harder case, governed by a separate rule: Civil and Commercial Code Section 722, which lets an earlier-registered mortgage outrank a later-registered lease or superficies entirely.

What Section 722 actually says

Section 722 provides that when land has already been mortgaged, and a servitude or other real right is registered afterward without the mortgagee's (lender's) consent, the mortgage has priority — and the later right can be struck from the register if its existence prejudices the mortgagee at enforcement. A registered lease and a registered superficies are both exactly this kind of real right. Applied to Koh Phangan's standard structure — a foreign buyer holding a 30-year lease plus superficies over land a Thai landowner still holds freehold — the question becomes simple to state and easy to miss: which was registered first, the mortgage or your lease?

Before the mortgage vs. after it

• Lease/superficies registered before any mortgage exists. You're in the stronger position — nothing in Section 722 touches a real right that predates the mortgage. A bank lending against the land afterward takes it subject to your existing lease.
• Mortgage already exists when you register your lease. The mortgage outranks you by default. If the landowner later defaults and the bank forecloses, your lease is exposed — the auction buyer is not automatically bound to honour it, and the Land Office can strike the registration to clear the way for enforcement.
• The fix is the mortgagee's written consent. Section 722 only subordinates a right registered "without the consent of the mortgagee." If the bank formally consents to (or is joined in) the lease/superficies registration, your right stands even though it came second — this is the document to obtain, not just a landowner's verbal assurance that a loan is fine.

Why this is easy to miss during due diligence

A Land Office encumbrance search shows you whether a mortgage exists on the title today — but it doesn't tell you whether the landowner will take one out next year, after your lease is already registered. That's the harder half of the risk: a clean title search at signing doesn't protect you from a mortgage the landowner registers afterward, since Section 722's priority runs by registration order regardless of which one existed when you did your homework. This is also a materially different risk from multiple mortgages stacked on one title, which only ranks mortgages against each other — Section 722 ranks a mortgage against a lease or superficies, a different kind of right entirely.

What a Koh Phangan buyer should actually do

• Check for an existing mortgage before signing anything. If the Land Office record shows one, get written legal advice on priority before registering your lease and superficies — and treat the landowner's cooperation in obtaining the bank's consent as a condition of the deal, not an afterthought.
• Ask your lawyer to build in ongoing protection, not just a point-in-time check: a contractual undertaking from the landowner not to mortgage the land during your term without your — and ideally the existing lender's — written consent, mirroring the prohibition-on-mortgaging clause this site already recommends for every lease.
• If a mortgage does appear after your lease is registered, that's exactly when independent legal advice matters most — whether the specific facts trigger Section 722 depends on registration dates, the mortgagee's conduct, and the lender's own consent, not a general rule you can apply yourself.

None of this makes leasehold-plus-superficies unsafe as a structure — it remains the standard, workable route for foreign ownership on Koh Phangan, and most landowners never mortgage the underlying land during a buyer's term. But Section 722 is the concrete legal reason a mortgage check isn't a one-time box to tick at signing: it's the difference between a lease that survives foreclosure and one that doesn't.