Paint Buying Checklist: 14 Things to Check Before You Pay

Standing in a DIY store paint aisle without a plan is how people end up with three half-used tins of slightly different whites and a fourth trip back for the colour they actually wanted. This fourteen-point checklist covers everything worth checking before money changes hands, so you buy the right paint, in the right quantity, exactly once.

The 14-point checklist

1. Calculate the quantity first. Run the paint calculator before you leave the house. Buying blind is the single most common waste of money.
2. Buy it all in one batch. Paint colour varies subtly between production runs. Buying every tin at once, from the same batch, guarantees an even colour across the whole room.
3. Box the tins together. Even within one batch, mix all your tins in a single larger bucket ("boxing") before painting to average out any minor variation.
4. Round up, not down. If the calculator says 4.2 litres, buy five. Running out mid-wall is worse than a small leftover for touch-ups.
5. Keep 0.25–0.5 L for touch-ups. Label and seal it well. Stored away from frost, water-based paint stays usable for two to five years.
6. Check the finish matches the surface. Matte for ceilings and low-traffic walls, eggshell for living areas, satin for kitchens and bathrooms, semi-gloss for trim. See the finish guide.
7. Verify the coverage rate. The m² per litre figure is printed on the tin. If it differs from the calculator default, switch to "Custom coverage" and type in the real number.
8. Buy primer if needed. Bare plaster, big repairs, drastic colour changes and glossy existing paint all need primer. Skipping it costs you an extra topcoat.
9. Pick the right applicators. A 9 mm nap roller for smooth walls, 13 mm for textured; a 50 mm angled brush for cutting in; a sturdy tray with a liner.
10. Consider low- or zero-VOC. Low-VOC paints smell less, off-gas less and are safer in occupied homes. They are now widely available at no quality penalty.
11. Check the dry and recoat times. These are on the tin. If you only have one weekend, avoid paints that need 24 hours between coats.
12. Buy matching white for ceilings. Ceiling white and wall white are not the same. A dedicated ceiling paint is flatter, less spattery and designed not to reflect light.
13. Don't skimp on quality. Cheap paint often needs three coats to cover, wiping out any saving and increasing labour. Mid-range and premium paints cover better and last longer.
14. Ask about mistints. Many stores sell correctly-mixed paint returned by other customers at a heavy discount. Great for utility rooms, garages and feature walls where the exact shade is flexible.

How much should paint cost?

Budget interior emulsion starts around £3–5 per litre, mid-range trade-quality paint is £6–9 per litre, and premium designer paints can reach £15–25 per litre or more. The sweet spot for most living areas is a good mid-range paint at around £6–8 per litre — good pigment load, decent coverage, washable finish, without paying for a designer name. For trim and high-wear areas, spending slightly more on a quality gloss or eggshell pays for itself in longevity.

Enter your chosen price per litre and can size into the calculator's Cost section and the total spend appears instantly, rounded to whole cans. That figure is the one to take shopping — it is what the project will actually cost, not a back-of-envelope guess.