How Much Does Waterproofing Cost?
Book on LINERooftop waterproofing with acrylic or PU coating runs 200–400 baht per square metre; waterproofing a bathroom before tiling runs 150–300 baht per square metre. The material chosen matters almost as much as the area, since PU costs more but holds up far longer than acrylic where a surface has moved or cracked before.
- Response time
- within 24 hours
- Warranty
- 7 days
- Rework guarantee
- Yes
- Visit fee (same province)
- THB 500
| Item | Price |
|---|---|
| Rooftop waterproofing (acrylic/PU) | THB 200–400 / sq.m. |
| Bathroom waterproofing before tiling | THB 150–300 / sq.m. |
| Wall waterproofing (damp walls) | THB 250–450 / sq.m. |
Market reference range · actual price per quotation · Market estimates, not yet derived from completed jobs · last reviewed July 2026
The real price comes from the technician’s quotation. Usually it is priced from the photos and details you send on LINE, with no visit first; for some jobs the technician needs to see the site first and then sends the quote. Either way you confirm the price, and only then does the work start.
A visit costs 500 baht when the technician comes from your own province and 2,000 baht from another one. It is counted inside the quote’s single total rather than billed separately, and it is not refunded if you look and decide against the repair.
If a job needs the technician to see the site before a quote can be given, and that look ends with you deciding against the work, whether the visit is charged depends on the job; you are told before the visit.
The quoted total covers every item you confirmed, but not replacement parts: whether any are needed can only be established on site, and if they are, they are charged on top of the total.
What changes the price
- Existing surface condition — a surface that needs sanding down or filling several cracks first takes longer to prep than one already in good condition
- Coating type chosen — acrylic is cheapest; cement-based coating sits in the middle; PU is more expensive but more durable
- Whether the leak is coming from one spot or spread across the whole area — a full-area treatment uses more material and time than sealing a single point
- Whether the work happens before tiling or after a leak has already appeared — waterproofing a bathroom before it's tiled is straightforward and cheap; doing it after tiles are already down and a leak has shown up means removing them first, which costs considerably more
How to spend less
- Waterproof bathrooms and other wet areas before tiling, while it's still easy and cheap — waiting until a leak shows up means the existing tile has to come out first to fix it
- Fix small cracks in a rooftop or wall as soon as you notice them, before water gets in deep enough to need treating a much larger area
- If more than one spot in the same property needs waterproofing — a rooftop and a bathroom, say — book them together rather than calling a technician out for each separately
Frequently asked questions
Am I being charged a foreigner price for this?
The ranges here are the same market reference regardless of who's asking. What actually protects you is that the technician confirms the price for your exact area and material choice over LINE, in writing — compare it against this page rather than a verbal number.
Is PU coating actually worth paying more for than acrylic?
PU is more durable and flexes with a structure's movement better than acrylic, which suits an area that's had repeat leak problems before. Acrylic costs less and suits an ordinary area with no history of serious trouble — the technician can advise based on what's actually happened there before.
Water is leaking through my top-floor condo ceiling from the roof above — is that my cost or the building's?
The shared roof over multiple units is typically the juristic office's responsibility to maintain, not an individual owner's — but the point where responsibility sits depends on exactly where the water is entering, which is worth confirming with the juristic office before booking any work yourself.
Why do some waterproofed areas leak again later?
Usually because the actual cause was never fixed — a structural crack that keeps moving, for instance, or coating that missed the edges and corners where leaks actually start. The technician traces the real source before starting, every time.
Ready to get it fixed?
Message us on LINE. The price comes back before anyone turns up.
What to put in the first message
- 1photos of what is broken — one wide, one close on the problem
- 2what it is doing, when it started and how long it has been like that
- 3the province or district the technician has to come to
- 4the times of day a technician can come