How do I test a paint colour?

Paint a large patch on two different walls or on lining paper and look at it in different light over a few days.

Do dark colours make a room look smaller?

They can make it feel cosier. In a small room a dark colour used on walls and woodwork can look deliberate and stylish, but it does reduce reflected light.

Which finish should I use?

Matt for most walls and ceilings, and eggshell or satin for woodwork and rooms that need wiping. Use paint made for damp rooms in kitchens and bathrooms.

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How to choose paint colours for a room

By the GlowUpp team · 27 October 2026

A scuffed, bare wall next to the same room repainted in green

BeforeAfter‹›

An AI-generated example. Real results depend on your own space.

Colours look different in every room and every light, which is why paint chips so often disappoint. A little planning and some testing is far cheaper than repainting a room you do not like.

Start with the light

North-facing rooms get cooler, bluer light and can make colours look flat or grey. South-facing rooms are warmer and brighter. Look at your room at different times of day before you choose.

Work from what you cannot change

Floors, worktops, tiles, a sofa you are keeping and the colour of the woodwork all affect which colours will work. Choose paint to suit them rather than the other way round.

Pick a simple palette

One main colour for most of the walls.
A lighter or darker shade for woodwork and ceilings.
One accent for a feature wall, a door or furniture.

Dark colours can work in small rooms

A dark, rich colour can make a small room feel cosy rather than small, especially if you carry it over the walls and woodwork. Light colours reflect more light and help a dim room.

Test before you buy lots

Buy a sample pot, paint a large patch on two different walls (or on a big piece of lining paper) and look at it in the morning, the afternoon and with the lights on. Live with it for a few days.

Choose the right finish

Matt hides imperfections on walls and ceilings. Eggshell or satin is easier to wipe and suits woodwork, kitchens and bathrooms. Use paint made for damp rooms where it is needed.

Mistakes to avoid

Choosing from a tiny paint chip under shop lights.
Skipping the testing stage.
Painting over damp, flaking or mouldy walls without fixing the cause first.
Using too many different colours.

See it before you paint

Upload a photo of your room to GlowUpp to see AI-generated colour ideas on your own walls. It is a guide, not an exact match, so always test a real sample. Always ask a qualified professional before moving gas, electrics or plumbing, or changing anything structural, and check your lease or local rules if you rent or live in a conservation area.

See your own painting redesigned

Upload a photo and see AI-generated ideas in about two minutes. Free for homeowners, no sign-up needed to start.

Try it with your photo

Common questions

How do I test a paint colour?: Paint a large patch on two different walls or on lining paper and look at it in different light over a few days.
Do dark colours make a room look smaller?: They can make it feel cosier. In a small room a dark colour used on walls and woodwork can look deliberate and stylish, but it does reduce reflected light.
Which finish should I use?: Matt for most walls and ceilings, and eggshell or satin for woodwork and rooms that need wiping. Use paint made for damp rooms in kitchens and bathrooms.