Roof and façade work cost per sq ft in India: what decides the price
How roof waterproofing, roof replacement, ACP/HPL cladding and exterior paint are priced per sq ft in India, what moves the rate, and the rules to check in 2026.
Roof and façade work in India is almost always quoted as a rate per square foot multiplied by an area, plus a few lump sums for things like scaffolding, removal of old layers and debris. The rate depends mostly on four things: the system (for example a cement-based coating versus a polyurethane membrane, or a bare metal sheet versus an insulated panel), the condition of the surface and how much preparation it needs, the height and access, and the product grade. As an illustrative guide only, a simple terrace coating can cost a few tens of rupees per sq ft, a metal roof on a new steel frame a few hundred, and premium HPL cladding more than that. On top comes GST, generally 18% on a supply-and-apply works contract.
The four building blocks of any quotation
| Block | What it covers | Why it changes the price |
|---|---|---|
| Area | Square feet actually treated, measured flat plus upturns, laps and wastage | A terrace's "carpet" size understates the area to be waterproofed; parapets and laps add more |
| System | Product type, number of coats or layers, thickness | Two coats of an acrylic coating and a primer plus three coats of PU are both called "waterproofing" |
| Preparation | Breaking out old layers, crack filling, cleaning, primer, slope correction | Often the largest hidden cost on an old terrace or a weathered wall |
| Access and lump sums | Scaffolding, rope access, lifting material to upper floors, debris removal | Fixed costs that matter more on small jobs and tall buildings |
When you compare quotations, line up these four blocks. A low rate per sq ft can hide a thin system or skipped preparation; a high rate may include breaking out the old layer that another contractor will add later as an "extra".
Illustrative ranges by system
The table below gives illustrative supply-and-apply ranges before GST, on an accessible surface in reasonable condition. Use them to see the relative cost of systems, not as a price list.
| System | Illustrative range per sq ft | Read more |
|---|---|---|
| Cementitious waterproof coating | ₹25–60 | Terrace waterproofing cost |
| Acrylic / elastomeric liquid membrane | ₹40–90 | Same guide |
| PU liquid membrane | ₹70–150 | Same guide |
| APP / SBS bituminous membrane | ₹60–130 | Same guide |
| Colour-coated or Al-Zn coated sheet on existing frame | ₹90–180 | Metal roofing sheet cost |
| Sheet roof with new steel structure | ₹180–350 | Same guide |
| ACP cladding with sub-frame | ₹250–550 | ACP and HPL cladding |
| HPL cladding with sub-frame | ₹450–900 | Same guide |
| Exterior repaint, primer + 2 coats | ₹18–45 | Exterior painting cost |
The comparison page sets these systems side by side with what each suits and what to watch for.
What pushes the rate up or down
Upwards:
- Old layers to remove, such as cracked brickbat coba, loose tiles or flaking paint
- Many pipes, vents, solar mounts or water tank stands that need detailing
- Height above two or three floors, or no space for scaffolding
- Premium product lines, extra coats, or a manufacturer's system warranty that requires a specified build-up
- Work in or just before the monsoon, when demand is high and drying days are few
- Small areas, where fixed costs are spread over fewer square feet
Downwards:
- A sound surface that only needs cleaning and a primer
- Easy access from the terrace or ground
- A larger area in one go, for example a whole society building
- Scheduling the work in the dry months
The rules around the work in 2026
Price is only part of the decision. Four sets of rules affect roof and façade work:
- GST. A contract where the contractor supplies material and labour together is a works contract, generally taxed at 18%. Materials bought separately carry their own rates; cement moved from 28% to 18% from 22 September 2025. See GST on roofing, cladding and painting work.
- Building permission. Repairs at the same height usually do not need a building permit under many municipal bye-laws, but structural changes, new sheds and some façade changes do. See building permission for alterations.
- Society and RWA approvals. In apartments, terraces and outside walls are usually common areas. See society and RWA rules.
- Fire safety for cladding. For taller buildings, the National Building Code and local fire services set façade requirements. Ask before choosing ACP.
A quick worked example (illustrative)
A two-storey house has a 900 sq ft flat terrace with 1.5 ft high parapets on a perimeter of 120 ft. The owner wants a PU membrane.
- Flat area: 900 sq ft
- Parapet upturn (say 1 ft of the parapet treated): 120 × 1 = 120 sq ft
- Total to treat: 1,020 sq ft
- At an illustrative ₹110 per sq ft: 1,020 × 110 = ₹1,12,200
- Removal of loose screed and debris, lump sum: ₹12,000
- Subtotal: ₹1,24,200
- GST at 18%: ₹22,356
- Total: about ₹1,46,556
The roof and façade cost estimator does the same arithmetic with a low and high range.
Guides in this section
- Terrace waterproofing cost per sq ft
- Metal roofing sheet cost per sq ft
- ACP and HPL cladding cost and fire safety
- Exterior painting cost per sq ft
- GST on roofing, cladding and painting work
- Building permission for roof and façade alterations
- Society and RWA rules for façade and terrace work
FAQ
Why do two contractors quote such different rates for the same terrace?
Usually because they are not quoting the same thing. One may include breaking out old layers, three coats and a parapet upturn; the other may quote a single coat on the flat area only. Ask both to quote the same system, coats and measurement method.
Is a lump-sum quotation better than a per-sq-ft rate?
A lump sum gives certainty, but only if the scope is written down. A per-sq-ft rate is easier to compare, but agree in advance how the area will be measured at the end.
When is the cheapest time to do roof work?
Demand tends to peak just before the monsoon. Planning work in the dry months gives contractors more drying days and you more negotiating room, but the actual effect on price varies by city.
Should I get a structural engineer?
Yes, if you see wide or growing cracks, a sagging slab, exposed and rusting steel, or plan to add load such as a new sheet roof, water tanks or heavy tiles.
Sources and where to check
- Central Board of Indirect Taxes and Customs (CBIC) GST portal — GST rate notifications for works contracts and goods
- GST Council — press releases on the rate changes from 22 September 2025
- Bureau of Indian Standards — Indian Standards and certification for building products, and the National Building Code
- Ministry of Housing and Urban Affairs — model building bye-laws and urban policy
