Two quotes for one terrace can differ honestly by a wide margin — because "waterproofing the terrace" can mean six different scopes. The number moves on what is being done, not just how many square feet. Know the drivers and quotes become comparable; ignore them and the lowest bid wins by omitting the work.
The six drivers
1. Surface condition
A sound bare slab needs cleaning and coating. A terrace with hollow tiles, failed old coating or open junctions needs demolition, disposal and repair before any chemistry — often the larger half of an honest bill (what preparation involves).
2. Drainage correction
If water stands, screed falls must be corrected — real material and mason days that a coating-only quote silently excludes and a lasting job cannot (mistake nine).
3. Detailing quantity
Parapets to turn up, junctions to cove, drains and pipes to collar: a terrace crowded with details costs more per square foot than an open one, because the details are where the labour — and the protection — lives.
4. System chosen
Chemistry and coats per the slab's needs (how the roof picks), plus a wearing layer if the terrace is walked daily. More system, more material, more life.
5. Access and scale
Material up four floors without a lift is priced labour. Small terraces carry setup costs across few square feet; large ones amortise them — rate-per-foot falls with area.
6. Test and guarantee terms
A bid including a ponding test and stated service terms is pricing accountability. It should cost slightly more; it is worth more.
Comparing bids on substance
- Demand scope in writing: preparation, drainage, detailing, system and coats, test — line by line.
- Strike bids that skip preparation or drainage lines; they are priced to fail politely.
- Compare like scopes; remaining differences are crew quality and margin — decide those on shown work.
We quote material for terraces across India and application where we cover the area — via the terrace page, scoped after photographs, with the drivers above itemised. No number is printed here because your terrace, not an average, sets it.
Frequently asked questions
Per square foot or lump sum?
Either, if the scope is written. A per-foot rate on an unwritten scope is a number wearing a disguise.
Is DIY meaningful savings?
On a small sound slab, materially yes (the method). On repair-heavy terraces, the preparation is the job — and the part experience prices correctly.