Home Painting Cost: How to Estimate Paint, Putty and Labour for a Flat

Repainting a flat before Diwali is a common plan, and the budget is easier to control when the quantities are worked out first. This guide shows how to measure the area to be painted, how many litres of paint, primer and putty that area needs, and how to read a painter's quote. The method works for any flat or house in Bangalore and needs only a tape measure and a calculator.

What Decides the Cost of Painting

The price of the paint tin is only one part of the bill. Five things set the total, and each one is worth fixing before asking for quotes.

• The area of walls and ceilings to be painted
• The number of coats
• The grade of paint chosen, from economy to premium
• The condition of the walls, which decides how much putty, primer and repair is needed
• Labour, including masking, furniture moving and cleaning up

Step 1: Measure the Paintable Area

Painting is priced on wall and ceiling area, which is several times larger than the floor area of the home. Measure one room at a time and add the rooms together. The sums are simple.

1. Add the length and width of the room and double the total to get the perimeter.
2. Multiply the perimeter by the ceiling height to get the wall area.
3. Add the ceiling, which equals the floor area of the room.
4. Subtract doors, windows and full-height wardrobes, because they are not painted with wall paint.

A bedroom example

Take a bedroom of 12 ft by 10 ft with a 9 ft ceiling. The perimeter is 44 ft, so the walls come to 396 sq ft, and the ceiling adds 120 sq ft for a total of 516 sq ft. One door of 21 sq ft and one window of 20 sq ft bring the paintable area down to 475 sq ft.

In this example the paintable area is about four times the floor area of the room. That ratio is a handy first estimate for a whole home before the room-by-room measurement is done. A flat with 1,000 sq ft of carpet area works out to roughly 4,000 sq ft of walls and ceilings on this basis.

Step 2: Work Out the Paint

Coverage is printed on every tin and on the product data sheet. A mid-range interior emulsion typically finishes about 130 to 150 sq ft per litre in two coats on a normal plastered wall. Two coats are the minimum that manufacturers recommend for an even finish.

Divide the paintable area by the coverage to get the litres. The 475 sq ft bedroom needs about 3.2 to 3.7 litres, so a 4-litre purchase covers it with a little left for touch-ups. The 1,000 sq ft flat needs about 27 to 31 litres for two coats.

Real consumption moves with the wall. A smooth, primed surface uses less paint, while a rough or porous wall soaks up more. A change from a dark colour to a light one often needs a third coat, which adds half as much paint again.

Step 3: Add Primer and Putty

The full system for a new or badly worn wall is one coat of primer, two coats of putty and two coats of paint. A wall that is sound and already painted needs far less: patch putty over dents and cracks, spot primer over the patches, then the paint. The condition of the wall therefore changes the material bill more than the colour does.

• Interior primer covers about 215 to 270 sq ft per litre in one coat on a smooth wall
• Wall putty covers about 10 to 15 sq ft per kg when applied in two coats

For the 475 sq ft bedroom, a full primer coat takes about 2 litres. Full two-coat putty over the same area takes roughly 32 to 48 kg, which shows why putty work is priced separately. Ask the painter to state which walls get full putty and which get patch work only.

Step 4: Fix the Walls First

Paint applied over a damp wall peels within months, however good the product. Seepage and dampness need waterproofing at the source before any painting starts. Cracks are filled and left to set, and fungus is cleaned off and treated.

In an apartment, damp patches often come from a bathroom on the other side of the wall, a leaking pipe or the outer face of the building. Outer wall and terrace repairs usually fall to the owners' association, so raise them early. Repair costs fall outside the painting quote and are best budgeted as a separate line.

Step 5: Read the Painter's Quote

Quotes are hard to compare unless they measure the same thing. Some painters quote per sq ft of painted wall area, and others quote per sq ft of the home's floor area. The second kind looks cheaper per sq ft and is not, since the wall area is about four times larger.

Ask every painter for the same details in writing.

• The basis of measurement and the total area they have assumed
• The brand and exact product name for paint, primer and putty
• The number of coats of each
• Whether ceilings, doors, grilles and balconies are included
• Who buys the material, and whether unopened tins are returned
• Masking, furniture covering and cleaning after the work
• The number of working days and the payment stages

A quote that names only "two coats of premium emulsion" leaves room for a cheaper product on site. Check the tins when they arrive and keep the purchase bills. Hold back the final payment until the walls have been seen in daylight.

Timing the Work Before Diwali

Diwali falls in November in 2026, and painters' calendars fill up in the weeks before it. Bangalore also gets rain in October, which slows drying and makes damp walls harder to treat. Booking the work early in the season leaves room for a wet week.

Each coat of putty, primer and paint needs a few hours to dry before the next, and the exact gap is printed on the tin. A room therefore takes several days once putty, primer and two coats are counted. Many apartment associations restrict working hours and the use of lifts for material, so check the rules before the painters arrive.

A Simple Budget Sheet

Put the estimate on one page before calling painters. List each room with its paintable area, then total the litres of paint and primer and the kilograms of putty. Add labour, wall repairs and a small reserve for extra coats.

With that sheet in hand, each quote can be tested line by line. Large gaps between quotes usually trace back to the grade of paint, the amount of putty work or the measurement basis. The cheapest quote and the best value are often different once those three are matched.