Choosing paint colours is one of the cheapest ways to transform a home, but it is also one of the easiest decorating decisions to get wrong. A shade that looks perfect on a tester card can turn grey, cold, too yellow or far too dark once it covers four walls. The direction your room faces, the type of light it gets, the colour’s undertones, your flooring and furniture, and even the paint finish all change how a colour looks.
This guide explains how to choose paint colours with confidence. It covers undertones, room aspect, Light Reflectance Value (LRV), colour schemes, the 60-30-10 rule, sampling, paint finishes, room-by-room advice, period homes, how much paint you need, UK painting and decorating costs, and the most common mistakes to avoid.
Table of Contents
Why Choosing Paint Colours Is So Tricky
Paint colour is never seen on its own. It is affected by:
- Natural light: direction, strength and time of day
- Artificial light: bulb colour temperature
- Undertones: hidden hints of other colours within a shade
- Surroundings: floors, kitchen units, furniture, curtains and woodwork
- Finish: matt, eggshell, silk or gloss
- Room size: colour looks stronger over large areas than on a small swatch
A common surprise is how much darker or lighter a colour looks once applied. One designer notes that when walls look lighter or darker than you thought they would, it all comes down to LRV.
Step 1: Understand Undertones
Every colour has an undertone, a subtle hint of another hue beneath the main colour. A grey might lean blue, green or purple. A white might lean yellow, pink or grey. A beige might lean pink or green.
Warm vs Cool Undertones
| Undertone Type | Hints Of | Effect |
|---|---|---|
| Warm | Red, yellow, orange, pink, brown | Cosy, inviting, sunny |
| Cool | Blue, green, grey, purple | Calm, crisp, fresh |
| Neutral | Balanced | Flexible, adaptable |
Warm undertones are yellows, oranges, reds, browns, beiges, tans.
Hidden Undertones to Watch For
Some neutrals look plain on the card but reveal surprising tones on the wall. Certain grays, taupes, and greiges contain hidden purple undertones. North-facing light tends to amplify these undertones, which can create unexpected lavender or violet casts.
Match Undertones to Fixed Finishes
Look at the things you aren’t changing: flooring, kitchen worktops, tiles, stone fireplaces and large furniture. When choosing paint colours, it’s important to coordinate the undertones of your paint colour with your existing finishes, otherwise, you risk CLASHING undertones.
Tip: to spot an undertone, hold the swatch against pure white paper, or compare several shades of the same colour side by side. The undertone becomes much easier to see.
Step 2: Consider Which Way Your Room Faces
In the UK, a room’s aspect makes a big difference to how colour looks.
| Aspect | Light Quality | Colour Approach |
|---|---|---|
| North-facing | Cool, flat, blue-toned, consistent | Warm undertones; or embrace deep, rich shades |
| South-facing | Warm, bright, changes through the day | Most colours work; cool tones balance the warmth |
| East-facing | Bright and warm in the morning, cooler later | Warm or soft shades for afternoon/evening use |
| West-facing | Cool in the morning, warm golden evening light | Consider how the room looks in the evening |
North-Facing Rooms
North-facing rooms are the most challenging. Benjamin Moore explains that light in north-facing rooms is cool and blue-toned, making colours with grey, blue or lavender undertones appear more dull (which includes most “brilliant whites”).
The usual solution is warmth. B&Q advises that to counteract the cool light, the paint you choose should have warm undertones like red, pink or yellow. Neptune similarly recommends that it’s best to pass up paint colours with grey or green undertones in favour of those with warmer ones.
Good choices for north-facing rooms:
- Creamy, warm whites
- Warm beiges and soft stone shades
- Soft yellows, pinks and light terracottas
- Warm greens with yellow undertones
- Deep, saturated colours that embrace the shadowy light
Dark colours can work well too. One designer suggests that rich, saturated colours can add depth and warmth to a north-facing room, making it feel more inviting.
South-Facing Rooms
South-facing rooms get warm light, so warm undertones become more noticeable. The windows in a South facing room let in cozy warm natural light throughout the day. This means that the warm undertones in a paint color will appear a little more prominently. Cooler blues, greys and greens work well here because the warm light stops them feeling cold.
East- and West-Facing Rooms
Think about when you use the room. A bedroom used mostly in the morning behaves differently from a living room used mostly in the evening. West-facing rooms get warm, golden evening light, while east-facing rooms are brightest early in the day.
Step 3: Use Light Reflectance Value (LRV)
LRV is a number that tells you how much light a colour reflects. Homebuilding explains that it runs on a scale from 0 (absolute black) to 100 (pure white), and everything you paint your walls with falls somewhere in between.
| LRV Range | Colour Type | Effect |
|---|---|---|
| 80–100 | Whites and very pale shades | Reflects most light; brightens rooms |
| 60–80 | Light colours | Light and airy |
| 40–60 | Mid-tones | Balanced |
| 20–40 | Deeper shades | Cosy, enveloping |
| 0–20 | Very dark colours | Dramatic, absorbs light |
Many UK paint brands show LRV on their websites or colour cards. It is especially useful for dark rooms. For north-facing spaces, one designer advises that you want to look for light colors with a medium to high LRV and warm undertones. These colors will brighten the room while maintaining warmth.
Important: a high LRV doesn’t automatically make a dark room feel bright. In a gloomy room, pale colours can look grey and dull, so a deeper colour can sometimes look better.
Step 4: Think About Artificial Lighting
You will see your walls under artificial light most evenings, especially in a UK winter. Bulb colour temperature changes colour appearance:
| Bulb Type | Effect on Paint |
|---|---|
| Warm white (2700K) | Adds warmth; yellows and reds look richer, blues look softer |
| Neutral white (3000–4000K) | More accurate colours |
| Cool white/daylight (5000K+) | Colours look cooler, sometimes harsher |
Sherwin-Williams suggests a useful shortcut: if you opted for warm lighting, choose colors as if you would for a south facing room. If you chose white or cool toned lighting choose colors as you would for a north facing room.
Step 5: Choose a Colour Scheme
Colour Wheel Schemes
| Scheme | How It Works | Effect |
|---|---|---|
| Monochromatic | Different shades of one colour | Calm, sophisticated |
| Analogous | Neighbouring colours (e.g. blue and green) | Harmonious, relaxed |
| Complementary | Opposite colours (e.g. blue and orange) | Lively, high contrast |
| Neutral | Whites, creams, greys, beiges | Timeless, flexible |
| Tonal | Light and dark versions of the same tone | Layered, cohesive |
The 60-30-10 Rule
This classic interior design rule helps balance colour in a room:
- 60%: main colour (walls, large rugs)
- 30%: secondary colour (furniture, curtains, an accent wall)
- 10%: accent colour (cushions, artwork, accessories)
Colour Drenching
Colour drenching means painting walls, ceilings, woodwork and sometimes radiators in the same colour or very close shades. It makes small rooms feel cohesive and cocooning, and it is popular in UK homes for snugs, cloakrooms, studies and bedrooms.
Create Flow Through the Home
- Use a consistent neutral or tonal palette in hallways and connecting spaces
- Repeat one colour across rooms in different amounts
- Keep woodwork colour consistent throughout the home
- Use bolder colours in rooms with doors you can close
Step 6: Choose Colours by Mood
| Colour | Mood | Best For |
|---|---|---|
| Warm white/cream | Soft, welcoming | Hallways, living rooms, bedrooms |
| Grey | Calm, modern | Living rooms, offices (choose warm greys for north light) |
| Beige/stone | Natural, cosy | Living rooms, period homes |
| Green | Restful, natural | Bedrooms, kitchens, studies |
| Blue | Calming, fresh | Bedrooms, bathrooms |
| Yellow | Cheerful, sunny | Kitchens, north-facing rooms |
| Pink/plaster | Warm, soft | Bedrooms, living rooms |
| Terracotta | Earthy, warm | Living rooms, dining rooms |
| Navy/charcoal | Dramatic, cosy | Dining rooms, snugs, feature walls |
| Red/burgundy | Energetic, rich | Dining rooms, studies |
Step 7: Always Test Paint Samples
Testing is the most important step. B&Q advises that you should always sample paint on your walls and check it at different times of day. North-facing rooms often look darker, so colours can appear cooler than they do on a swatch.
How to Test Properly
- Shortlist two to four colours
- Buy tester pots or peel-and-stick samples
- Paint large swatches (at least A4, ideally bigger) or use sample boards
- Apply two coats for accurate colour
- Test on different walls, near windows and in darker corners
- Look at them in the morning, afternoon, evening and under artificial light
- View them next to flooring, furniture and woodwork
- Live with them for a few days before deciding
Tip: paint samples on lining paper or card so you can move them around and avoid patchy sample marks on your walls.
Step 8: Choose the Right Paint Finish
| Finish | Sheen | Durability | Best For |
|---|---|---|---|
| Flat/dead flat matt | None | Low | Ceilings, low-traffic walls, period homes |
| Matt | Very low | Moderate (washable versions available) | Living rooms, bedrooms |
| Eggshell | Low | High | Woodwork, kitchens, hallways, children’s rooms |
| Silk/satin | Medium | High; wipeable | Bathrooms, kitchens (some prefer matt kitchen and bathroom paint) |
| Gloss | High | Very high | Skirting, doors, trims, radiators |
Finish changes colour appearance. Higher-sheen finishes reflect more light and can make colours look slightly lighter and more saturated. They also show wall imperfections more clearly.
Specialist Paints
- Kitchen and bathroom paints: moisture and mould resistant
- Scrubbable matt: for hallways and family rooms
- Breathable paints: clay, lime or mineral paints for older solid-wall homes
- Low-VOC paints: better for indoor air quality
- Masonry paint: for exterior walls
Room-by-Room Paint Colour Tips
Living Rooms
- Choose colours that work in daytime and lamplight
- Warm neutrals, soft greens, muted blues and plaster pinks are popular
- Deep colours suit snugs and evening rooms
- Coordinate with sofa, rug and flooring
Bedrooms
- Calming colours: soft greens, blues, warm whites, plaster pinks
- Darker shades create a cocooning feel
- Avoid very stimulating, bright colours
- Consider painting the ceiling a soft tone for a cosy feel
Kitchens
- Coordinate wall colour with cabinets, worktops and splashbacks
- Choose durable, wipeable paint
- Warm whites, sage greens, soft yellows and stone colours work well
- Bold colours look good on islands and lower cabinets
Bathrooms
- Use moisture-resistant paint
- Coordinate with tiles and sanitaryware
- Soft blues, greens and warm whites are popular
- Dark colours can look dramatic in cloakrooms
Hallways
- The hallway sets the tone for the home
- Choose durable, washable finishes
- Consider a darker colour below a dado rail and lighter above
- Warm colours make narrow hallways feel welcoming
Home Offices
- Greens and blues support focus and calm
- Avoid colours that reflect onto your face on video calls
- Use warm whites if you need maximum brightness
Children’s Rooms
- Use scrubbable, washable paint
- Consider calmer base colours with bright accents
- Use colour blocking, murals or half-painted walls for fun
Choosing Colours for Small and Dark Rooms
Small Rooms
- Pale colours with high LRV can make rooms feel larger
- Painting walls and ceilings the same colour blurs boundaries
- Dark colours can make small rooms feel cosy rather than cramped
- Colour drenching makes small rooms feel intentional
Dark Rooms
- Avoid cold, grey-based whites
- Use warm, creamy whites or embrace darker, richer shades
- Add warm artificial lighting
- Use mirrors and reflective finishes
Choosing Colours for Period Homes
Older UK homes often suit colours inspired by their history.
| Period | Typical Colour Approach |
|---|---|
| Georgian | Soft stone, greys, muted greens and blues; elegant, restrained palettes |
| Victorian | Rich, deep colours: burgundy, dark green, navy, ochre |
| Edwardian | Lighter, softer pastels and creams |
| 1930s | Creams, soft greens, warm neutrals |
Many heritage paint ranges are designed for period properties. For solid-walled older homes, consider breathable paints. If your home is listed, check whether you need consent before changing external colours or historic features.
Ceilings and Woodwork
Ceilings
- Brilliant white is traditional but can look stark next to warm wall colours
- A softer white or a diluted version of the wall colour creates harmony
- Dark ceilings can make high ceilings feel lower and cosier
- Pale ceilings can make low ceilings feel higher
Woodwork
- Match woodwork to walls for a modern, seamless look
- Use white or off-white for a classic contrast
- Use a darker shade of the wall colour for depth
- Use durable eggshell or satin finishes
How Much Paint Do You Need?
Coverage
According to BookaBuilder, many interior emulsions cover about 10 to 14 square metres per litre for one coat on a smooth, sealed surface.
Simple Calculation
- Measure wall height × width for each wall
- Add the areas together
- Subtract windows and doors
- Multiply by the number of coats (usually two)
- Divide by the paint’s coverage rate
Example: a room with 40m² of wall, painted with two coats at 12m² per litre needs about 40 × 2 ÷ 12 ≈ 6.7 litres. That is two 2.5-litre tins and a 1-litre tin, or one 5-litre tin plus a 2.5-litre tin.
Rough, porous, new plaster or dramatic colour changes may need extra coats or a mist coat/primer.
Paint Costs in the UK
Paint Prices
| Paint Type | Typical Cost |
|---|---|
| Standard emulsion (matt or silk) | £10–£30 per litre |
| Ceiling paint | £8–£20 per litre |
| Woodwork paint | £10–£20 per litre |
| Primer/undercoat | £10–£20 per litre |
| Premium designer paints | £20–£40+ per litre |
These figures come from MyJobQuote, which reports that standard emulsion paint (matt or silk) – This type of paint will usually cost around £10 – £30 per litre, depending on the brand and quality of the paint. Budget trade paints can be much cheaper; MyJobQuote’s hallway guide lists Emulsion — £5.50 to £40 per litre, depending on whether you choose matt or silk.
Decorator Costs
| Item | Typical Cost |
|---|---|
| Decorator day rate (outside London) | £150–£355 |
| Decorator day rate (London) | £250–£460 |
| Painting an average room | £350–£600 |
| Small room/hallway | £350–£450 (rest of UK) |
| Medium bedroom | £400–£550 (rest of UK) |
| Painting a 5-bed house | Around £6,000 |
| Painting per m² of wall area | £10–£20 |
UK trade cost guides give quite different day rates. One analysis found Checkatrade publishing an average of £325 a day and MyBuilder £150 to £250. Fantastic Services reports that painting and decorating in the UK costs £350–£600 per room on average, and decorators charge a day rate of £230–£355 outside London.
Checkatrade says that in the UK, the cost to paint a room averages around £450. Meanwhile, painting a 5-bed house could cost in the region of £6,000.
London costs more. Fantastic Services notes that London adds roughly 20–30%.
DIY vs Hiring a Decorator
| Factor | DIY | Professional Decorator |
|---|---|---|
| Cost | Paint and tools only | Labour plus materials |
| Finish | Depends on skill | Usually smoother, sharper lines |
| Time | Slower | Faster |
| Preparation | Often rushed | Thorough filling, sanding and priming |
| Best For | Simple, small rooms | Whole houses, high ceilings, stairwells, woodwork |
Ways to Save Money
- Test colours before buying large tins
- Buy larger tins for big areas; they’re cheaper per litre
- Paint yourself and hire a decorator only for tricky areas like stairwells
- Group rooms into one job to get a better rate
- Choose quality paint: better coverage can mean fewer coats
Common Paint Colour Mistakes
| Mistake | Better Approach |
|---|---|
| Choosing from a tiny swatch | Test large samples on the wall |
| Ignoring room aspect | Match undertones to the light |
| Testing only in daylight | Check under evening artificial light |
| Ignoring undertones | Compare against flooring and furniture |
| Using brilliant white everywhere | Choose a softer white that suits each room |
| Choosing cold greys for north-facing rooms | Pick warm greys or other warm neutrals |
| Wrong finish | Use durable finishes in busy areas |
| Skipping preparation | Fill, sand and prime before painting |
| Too many unrelated colours | Create a cohesive palette |
| Following trends blindly | Choose colours you will love long term |
Paint Colour Checklist
- Note which direction each room faces
- Identify fixed finishes (floors, tiles, worktops, furniture)
- Decide on the mood you want
- Choose a colour scheme (neutral, tonal, complementary)
- Shortlist colours with suitable undertones and LRV
- Test large samples at different times of day
- Pick the right finish for each surface
- Calculate how much paint you need
- Get quotes if you’re hiring a decorator
- Prepare surfaces properly before painting
Final Thoughts
Choosing paint colours is about more than picking a shade you like on a card. Start by looking at your room’s light: north-facing rooms usually need warm undertones or rich, deep colours, while south-facing rooms can handle cooler shades. Check the undertones against your existing finishes, use LRV to judge how light or dark a colour will feel, and always test large samples at different times of day and under artificial light. Choose the right finish for each surface, plan a cohesive palette that flows through your home, and budget around £10–£30 per litre for standard emulsion or £350–£600 per room if you hire a decorator.
Frequently Asked Questions
1. What paint colours work best in north-facing rooms?
Colours with warm undertones such as creamy whites, warm beiges, soft yellows and pinks work best. Deep, rich colours also suit north-facing rooms.
2. What is LRV in paint?
LRV (Light Reflectance Value) measures how much light a paint colour reflects, on a scale from 0 (black) to 100 (pure white).
3. How much does it cost to paint a room in the UK?
Hiring a decorator to paint an average room costs about £350–£600, and London prices are typically 20–30% higher.
