Room Painting Cost Calculator

Use our room painting cost calculator to get an instant estimate of how much it costs to paint a room in the UK. It uses your room size, paint type, preparation needs, plastering needs, and location to give a more accurate guide price.

Room painting prices vary depending on room size, wall condition, and finish, with labour rates in London typically higher than elsewhere. Enter a few details below for a ballpark cost you can compare against real quotes from local painters.

Room Painting Cost Calculator

How to Use the Room Painting Cost Calculator

• Enter the room length, width, and height — These dimensions are used to estimate the size of the area that needs painting — see the measuring guide below if you're not sure how to take these.
• Select the paint type — Choose matte paint, semi-gloss paint, or gloss paint. Different finishes have different material costs, which affects the total estimate.
• Choose whether the walls need prepping — Look for cracks, peeling paint, stains, uneven surfaces, or old wallpaper that needs stripping. If any of these apply the estimate will add roughly half a day to a day of extra labour for filling, sanding, and sugar soaping.
• Choose whether the walls need plastering — Signs you may need this include crumbling or missing plaster, exposed brick or blockwork, large holes, or damage from damp. Plastering is a separate stage of labour and materials, so it adds more to the estimate than prep work alone.
• Select your region — Labour costs vary across the UK, with London and the South East often costing more than other areas.
• Review the instant estimate — The calculator combines your room size, paint type, preparation needs, and location using typical UK labour and material rates to give you a guide price.
• Use the result as a starting point when getting quotes from local painters and decorators — The final price may change if your walls need extra preparation, you choose premium paints, or you add more rooms, so compare a few written quotes before you go ahead.

Your result is a ballpark cost, not a fixed quote. A painter and decorator may adjust the final price after checking the condition of the walls, the amount of repair work needed, and whether any other areas need attention. For the full breakdown of what goes into a painting and decorating quote, see our room painting cost guide.

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How To Measure Your Room for Painting

Accurate measurements give you a more accurate estimate. Even small errors can affect how much paint is required and the likely labour costs.

Step 1: Measure the Length and Width

Measure the longest wall and the shortest wall in metres. These figures are used to estimate the floor area and the ceiling area.

• Length — Measure the longest side of the room.
• Width — Measure the shortest side of the room.

Step 2: Measure the Ceiling Height

Measure from the floor to the ceiling at the corner of the room. A standard ceiling is often around 2.4m, while older properties may have higher ceilings.

• Standard ceiling height — Around 2.4m.
• Older or period properties — Around 2.7m to 3m, or more.

Step 3: Enter the Figures Into the Calculator

Add the room length, width, and height into the calculator above. It will use these figures to estimate wall area, paint required, and the likely cost to paint a room based on your selections.

Manual Paint Area Check

If you are checking how much paint you need yourself, work out the total paintable area and then subtract large openings. As a rough guide, one internal door is about 2m², and one standard window is about 1.5m².

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How Much Paint Do You Need for a Room?

Paint quantity affects material costs directly, so it is useful to understand how decorators estimate how much paint is required. In general, larger rooms and rougher surfaces need more paint than smaller rooms in good condition.

Paint coverage is usually measured in square metres per litre (m²/L). This shows how much surface one litre of paint can cover for one coat.

Typical Coverage Rates by Paint Type

How To Estimate Paint Required

You can estimate the amount of paint needed with this formula:

(Paintable Area × Number of Coats) ÷ Coverage Rate = Total Litres Needed

This helps you understand how much paint you need before buying materials or reviewing quotes.

Example

If a room has 30m² of paintable wall area and you use matte paint with a coverage rate of 12m²/L:

• 30m² ÷ 12 = 2.5L for 1 coat.
• For 2 coats, you would need about 5L.

Real-world paint use may be higher if the surface is rough, the walls are freshly plastered, or the colour change is significant.

Ready to Get a Quote?

Painting is a great way to refresh a room, boost its value and make the space truly your own. But it's important to budget carefully to avoid unexpected costs. By understanding the key factors that affect painting prices and using a painting cost calculator, you can plan ahead and stay in control of your project. Try our wall paint calculator to get a quick estimate based on your room and preferences.

Get up to 3 free, no-obligation quotes from painters near you. All you need is a couple of minutes of time and some basic details about what you’re after. We’ll handle the rest!

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