ACP and HPL cladding cost per sq ft in India, and the fire-safety questions to ask
How ACP and exterior HPL cladding are priced per sq ft in India, why FR-core panels cost more, how the sub-frame changes the bill, and what fire rules to check.
Exterior cladding in India is quoted per sq ft of façade covered, and the rate has three parts: the panel (aluminium composite panel, ACP, or exterior-grade high-pressure laminate, HPL), the sub-frame that holds it off the wall, and fabrication and fixing, including joints, corners and openings. As an illustrative guide, ACP with an aluminium sub-frame might cost about ₹250–550 per sq ft before GST and HPL about ₹450–900, with height, access and the number of cut-outs pushing the rate up. The most important choice is not the colour but the core: fire-retardant (FR) or non-combustible grades behave very differently in a fire from a plain polyethylene core.
Part of roof and façade cost per sq ft in India.
ACP and HPL compared
| Point | ACP (aluminium composite panel) | Exterior HPL |
|---|---|---|
| What it is | Two thin aluminium skins bonded to a core | Layers of resin-impregnated fibre pressed into a solid panel with a weather-resistant surface |
| Look | Flat, metallic or solid colours, some wood and stone looks | Wood, stone and solid looks; matt surfaces |
| Illustrative rate with sub-frame | ₹250–550 per sq ft | ₹450–900 per sq ft |
| Fixing | Routed and folded into cassettes or fixed on rails, joints sealed or open | Mechanically fixed or bonded on a ventilated sub-frame |
| Watch for | Core type, coating type, sealant joints, oil canning on large panels | Fire classification of the grade, fixings allowing movement, edge sealing |
What decides the price
The panel grade
- Core: plain polyethylene (PE) cores are cheaper; FR cores with mineral fill and non-combustible (A2-type) grades cost more.
- Skin thickness and coating: thicker aluminium skins and higher-durability coatings cost more and resist fading and denting better.
- HPL thickness and grade: exterior grades with UV-resistant surfaces and fire-retardant versions cost more than standard grades.
The sub-frame
Aluminium sub-frames generally resist corrosion better than mild steel, and galvanised steel sits between the two. The wall must be able to take the anchors; old or hollow walls may need special fixings or a structural check.
Design and site factors
- Number of windows, balconies and corners (each needs cutting, folding and sealing)
- Panel size: large panels look better but waste more material
- Height and access: cradles, scaffolding or boom lifts
- Removal of old cladding or loose plaster
Fire safety: questions to ask before you choose
Cladding fires on tall buildings around the world have shown that a combustible façade can let fire spread quickly between floors. In India, fire safety for buildings is governed by Part 4 (Fire and Life Safety) of the National Building Code of India 2016, published by the Bureau of Indian Standards, and by state fire services acts and local fire authorities, which can set stricter rules. Requirements depend on the building's height and use.
Ask the contractor and supplier, in writing:
- Which core is offered, and what is its fire test classification and the standard it was tested to?
- Does the panel meet what your local fire authority and municipal body require for your building's height and occupancy?
- How are cavity barriers and fire stops handled at floor levels on taller buildings?
- Will the supplier give a test certificate for the batch supplied?
For a single-family house of one or two storeys, rules may be lighter, but the core choice still matters for safety, especially near balconies, staircases and electrical meters. For any building that needs a fire NOC, check with the fire service before buying panels.
Illustrative comparison: 800 sq ft front façade
| Option | Rate (illustrative) | Cladding | Scaffolding and removal (lump sum) | Subtotal | GST 18% | Total |
|---|---|---|---|---|---|---|
| ACP, PE core, steel sub-frame | ₹260 | ₹2,08,000 | ₹25,000 | ₹2,33,000 | ₹41,940 | ₹2,74,940 |
| ACP, FR core, aluminium sub-frame | ₹380 | ₹3,04,000 | ₹25,000 | ₹3,29,000 | ₹59,220 | ₹3,88,220 |
| Exterior HPL, aluminium sub-frame | ₹620 | ₹4,96,000 | ₹25,000 | ₹5,21,000 | ₹93,780 | ₹6,14,780 |
The extra cost of an FR core over a PE core in this illustrative example is ₹96,000 before GST. On a building where fire spread is a real risk, that difference buys safety that paint or a cheaper panel cannot.
Alternatives to full cladding
If the aim is to hide stains and cracks, an exterior repaint with crack repair is far cheaper. If the aim is weather protection on one wall, a ventilated cladding on that wall only, or a textured elastomeric coating, may be enough.
Permission and society approval
Cladding changes the look of the building. In apartments the outside wall is usually a common area, and many societies and associations require a uniform façade. Some municipal bye-laws also treat façade changes on certain buildings, such as heritage or listed buildings, as requiring permission. See building permission for roof and façade alterations and society and RWA rules.
FAQ
Is ACP waterproof?
The panels shed water, but the joints, edges and fixings decide whether water reaches the wall. Sealed joints need maintenance as sealants age; open-joint systems rely on a ventilated cavity and a weather-resistant wall behind.
How long does ACP or HPL cladding last?
It depends on the grade, coating, climate and fixing. Ask for the manufacturer's written warranty and read what it excludes, such as coastal exposure or improper installation.
Can ACP be installed on an old plastered wall?
Usually yes, if the wall can hold anchors. Loose plaster and hollow masonry need repair or special fixings first.
Does cladding need GST?
Supply and installation together is generally a works contract at 18% GST.
Sources and where to check
- Bureau of Indian Standards — National Building Code of India 2016, Part 4 Fire and Life Safety
- Ministry of Housing and Urban Affairs — model building bye-laws
- CBIC GST portal — GST on works contracts and aluminium products
