Tap a part of the house to see common signs and demo price ranges, with quick and full fixes priced apart If the building is 30 years or older, check the renovation subsidy first
Where does it leak?
Pick a part to see common signs and demo price ranges
30+ years old? Check the renovation subsidy →Urgent repair after a storm →Demo website: afterrain is a fictional contractor that takes no jobs and no money
A contractor for roofs, walls, windows, bathrooms, balconies and metal roofs. We inspect first to find the water's path, then put the quick fix and the full fix — method, price and warranty — side by side on the quotation
Prices are demo ranges; the quotation after an inspection is what counts
Ceiling stains on the top floor, dripping after rain; an aged membrane or poor drainage
Full fix, demo: NT$2,200–3,800 per pingFull fix: 3–5 dry days (demo)
Damp on the inside of outer walls, lifting tiles; water at AC holes and grille fixings
Full fix, demo: NT$3,500–6,500 per pingUpper floors need scaffolding or a lift
Leaks at the corners in rain, damp below the sill; aged sealant outside
Quick fix, demo: NT$2,500–5,000 a windowA spray test finds the entry point
Stains on the ceiling below after showers, damp outside the door; membrane or pipes first
Full fix, demo: NT$60,000–120,000 a roomPonding test and pipe pressure test
Stains below after rain, standing water; falls and the outlet
Full fix, demo: NT$8,000–15,000 per pingFull fix: 5–7 days (demo)
Drips at fixings, seepage at laps, rusted sheets; an overflowing gutter
Full fix, demo: NT$3,500–7,000 per pingWe help file any permit the work needs
Prices come in three parts: inspection, quick fix and full fix; signs of water in the structure point to the full fix
Demo price range · Flat roofs
Tick what you see, or book an inspection
Nothing ticked yet
Demo range — the quotation after an inspection is what counts
Visual check and moisture readings, a ponding test if needed, to find where water enters the slab
Clear drains and outlets, fill cracks, reinforce the failed patch
Strip the old layer, prime, two coats of membrane with fabric reinforcement, a reflective top coat
Drag the slider to see how a flat-roof membrane goes on; a quick fix treats the leak, a full fix rebuilds the whole system
The membrane has cracked and blistered; rain seeps through into the slab
| Quick fix | Full fix | |
|---|---|---|
| What | Treat the leak: seal, inject, clear drains | Rebuild the whole waterproofing |
| When | A new, small leak on a tight budget | Wide damp, dripping, or a repair that failed |
| Price | Lower | Higher, by area |
| Warranty (demo) | 1 year | 3–5 years, on the warranty |
The Ministry of the Interior's old-building renewal programme funds repairs to 4–6 storey apartment buildings and houses of up to 6 storeys; roof waterproofing and insulation is one of the items. Answer four questions
Building age
Building type
Lawful building
What needs fixing
May qualify
Your answers30 years or more · 4–6 storey apartment building · Has a use permit or title deed · Roof waterproofing
Roof waterproofing and insulation (outdoor item)
MOI caps: lifts NT$4m, facades NT$3m, and the other items including roof waterproofing between NT$400,000 and 500,000
Each item is funded at most 65% of its cost
afterrain is not a government-appointed contractor; we can help prepare the repair plan and quotation, but each city decides and nothing is guaranteed
Checked 18 Sep 2026; rules differ by city, the notice applies
Demo cases are fictional; filter by part and district. On a live site cases give the district only, with the owner's written consent for photos and details
Service area (demo): New TaipeiTap a district to filter
8 demo cases shown
Banqiao · 38 years old · May 2026
Flat roofs4 daysWarranty (demo) 5 yr
Zhonghe · 34 years old · June 2026
Exterior walls2 daysWarranty (demo) 3 yr
Yonghe · 41 years old · April 2026
Bathrooms3 daysWarranty (demo) 3 yr
Sanchong · 31 years old · March 2026
Window frames1 dayWarranty (demo) 3 yr
Tucheng · 33 years old · July 2026
Balconies and terraces5 daysWarranty (demo) 5 yr
Xindian · 22 years old · August 2026
Metal roofs2 daysWarranty (demo) 1 yr
Sanchong · 36 years old · August 2026
Flat roofs3 daysWarranty (demo) 5 yr
Banqiao · 44 years old · May 2026
Exterior walls6 daysWarranty (demo) 3 yr
Urgent repair only stops the current leak; a full inspection is still advised. Times and charges depend on the weather (demo)
afterrain · 霽簷防水工程
Under Article 21 of the Fair Trade Act, statements that affect a purchase must be true
Terms are examples; adjust to the company at launch
NT$2,000–8,000 depending on the part (demo), credited against the work if you go ahead (demo terms)
A quick fix treats the leak and costs less but may recur; a full fix rebuilds the system and carries a longer warranty
Membranes need dry weather: rain moves the dates and time counts dry days
It depends on the method and is written on the warranty — often 3–5 years for a full fix (demo); never a lifetime warranty
We can prepare the repair plan and quotation; each city decides, and we are not a government-appointed contractor
A contract signed at your home may be cancelled in writing within 7 days, no reason needed (Consumer Protection Act, Art. 19)
Pick the part, the signs and a time, attach photos and generate a demo booking
