How much paint a room actually needs: working it out

How much surface a litre of paint covers

Most wall paints sold in Estonia state a coverage figure on the tin, typically somewhere between 8 and 12 square metres per litre for one coat on a smooth, primed surface. This figure is measured under good conditions, so treat it as an upper limit rather than a promise.

Textured surfaces eat into that figure fast. A rough plaster wall, a stippled ceiling, or old wallpaper with a pattern pressed into it can drop real coverage to 6 or 7 square metres per litre, because paint sinks into the texture instead of sitting on top of it.

The tin's number is a starting point for your shopping list, not the number you should trust for a precise calculation. Always round up rather than down, and keep the receipt in case you need another litre.

Why two coats is standard, not extra work

A single coat of paint, even a good one, rarely gives an even finish. You will see brush marks, patches where the old colour shows through, and a slightly different sheen depending on the angle of light. This is normal and expected, not a sign of poor paint or poor technique.

Two coats is the standard assumption in any paint calculation, and manufacturers price and package their tins with that in mind. If you only budget for one coat, you will run out of paint partway through the second and end up with a mismatched batch from a different production run.

Some situations need a third coat regardless: strong reds and yellows in particular are notorious for needing extra layers to look solid and even, whatever the tin promises.

How dark colours and the existing wall change consumption

Painting a dark colour over a light one, or a light colour over a dark one, uses noticeably more paint than painting a similar shade over itself. Deep blues, greens and reds in particular often need a third coat to hide what was there before, especially near strong daylight.

A wall in poor condition, patched with filler, or freshly plastered and unpainted, will also absorb more paint into the first coat than a wall that has already been painted a few times. Porous new plaster can drink in almost a whole coat before it starts to show colour at all.

If you are changing from a dark wall to a pale one, or covering a patchy repaired wall, a coat of primer or a stain-blocking undercoat first is often cheaper than buying an extra litre or two of the finish coat to achieve the same result.

Worked example: an average room in a panel building

Take a typical room in a Tallinn panel flat, roughly 4 by 3.5 metres with a 2.6-metre ceiling. The four walls together come to about 39 square metres of gross wall area before you subtract anything.

Subtract a standard door (around 1.8 square metres) and a window (around 1.5 square metres), and you are left with roughly 35.7 square metres of paintable wall.

Using a realistic coverage of 8 square metres per litre for two coats, that room needs around 8.9 litres of paint in total, which in practice means buying two 5-litre tins rather than trying to cut it exactly to one.

• Measure wall length and height, multiply for gross area per wall
• Add all four walls together for total gross area
• Subtract door and window areas using their actual dimensions
• Divide the net area by the tin's stated coverage, then double for two coats
• Round up to the nearest tin size rather than buying the exact litre count

What affects the price if you get someone in to do it

If you would rather have the work done than the maths, our painting and decorating service starts from 12 € per job for small areas, with larger rooms quoted as a fixed price once we know the dimensions and condition of the walls. That figure covers the labour of preparing, taping and applying the coats.

What changes the quote is mainly the state of the walls: cracks and holes that need filling first, old wallpaper that has to come off, or a colour change dark enough to need extra coats all add time. Awkward access, high ceilings, or a room full of furniture that needs covering and moving also add to the hours.

Paint itself is usually bought by the customer, since taste in colour and brand varies, though we can buy it on your behalf with a 10 % handling fee added to the invoice. For anything beyond painting on the same visit, general odd-job work is billed from 39 € per hour.