How to Paint a Room in the Right Order: Prep, Ceiling, Walls, Trim

The short answer: top to bottom

Paint a room in this order: prepare, ceiling, walls, woodwork, then touch-ups. The reason is gravity. Livingetc says the ceiling goes first so paint does not drip or spray onto finished walls or floors^[1], and Splat makes the same point: any drips and splatters from the ceiling can be covered when you move on to the walls and trim^[2]. Which? states the rule as working from the top down: ceiling, walls, woodwork, then the areas near the floor^[3].

The sources disagree on one detail: whether woodwork goes before or after the walls. Dulux does the walls first and the windows, doors and skirting after^[4]; Livingetc undercoats the woodwork while the first ceiling coat dries and finishes it last^[1]; and Splat lists some painters who do trim before walls because it makes cutting in easier, or even trim, walls, then ceiling for crisp seams on textured surfaces^[2]. For most rooms, the Dulux and Which? order is the safe default.

This guide gives you that order with the detail underneath it: what to buy, what to check first on an old house, how long to wait between coats, and a worked example with real numbers.

What you need

• Dust sheets and masking tape. Which? puts dust sheets at under £10 and a roll of painter’s tape at about £5^[3].
• Filler, sandpaper and a filling knife. Widen hairline cracks slightly before filling, and use decorative caulk, not silicone, in corners and around woodwork^[3].
• Sugar soap or a mild detergent for washing walls; Livingetc suggests sugar soap, wiped off with clean water, for kitchens and bathrooms^[1].
• A stain blocker if there are grease or water stains; Which? recommends a shellac-based one^[3].
• Brushes: Livingetc lists 2, 2.5 or 3 inch brushes for surfaces and a 1 to 2 inch straight-edge brush for cutting in^[1].
• A roller and an extension pole. Livingetc says to use a roller no bigger than nine inches on the ceiling^[1]; Which? recommends a short-pile roller and not overloading it^[3].
• Ceiling paint (Which? says use ceiling-specific paint for ceilings), wall paint, and woodwork paint^[3].
• Steps or a ladder, a torch and good ventilation.
• A HEPA-filter vacuum if there is any chance of old lead paint (see below)^[5].

Safety first: old paint, lead and asbestos

This is the section to read before you pick up sandpaper. Most rooms are fine. A house from the early twentieth century may not be.

Lead in old paint

The British Coatings Federation’s guidance for the public says lead pigments were removed from most paints in the 1960s and from decorative paints by the early 1980s, so homes painted before the 1960s are the most likely to contain lead^[5]. Cambridge City Council gives the same cut-off: built before the 1960s with original coats of paint means there could be lead^[6].

What to do: if the paint is in good condition, leave it. The BCF says overcoating is the safest option and that removing sound paint can increase exposure^[5]. If it is flaking or dusty, both sources say to avoid dry sanding: moisten the surface and use waterproof abrasive paper^[6], and keep debris wet^[5]. Keep children and pregnant women out of the area^[5]. Wear overalls, rubber gloves and a particulate filter mask; the BCF warns that a fume mask will not protect against dust^[5]. Clean up with a HEPA-filter vacuum and wash surfaces down^[5].

On heat the sources split. Which? says not to use a heat gun on lead paint and to seek professional advice^[3]; the BCF says blow lamps and gas torches should not be used and that heat guns need care so the paint does not burn or give off fumes^[5]; Cambridge City Council allows a hot-air gun set below 450°C^[6]. The cautious reading, and our advice, is to avoid heat on old paint altogether. A negative home test kit result should not be relied on as proof there is no lead^[5]. If you are unsure, hire a qualified decorator; the council points to the Painting and Decorating Association^[6]. If you think someone has been exposed, speak to a doctor; the BCF gives NHS 111 for England^[5].

Asbestos and textured ceilings

The Health and Safety Executive says asbestos may be part of any domestic or commercial building built or refurbished before the year 2000, and lists textured decorative coatings, commonly called Artex, among the materials where it can still be found^[7]. HSE’s advice is to leave suspected asbestos alone if it is in good condition and unlikely to be damaged, to avoid DIY work on it, and to tell any builders about it before they start; it recommends seeking advice from the environmental health officer at your local council^[7]. HSE’s page does not mention sanding or scraping specifically, so our caution is plain: do not sand, scrape or drill a textured ceiling in a pre-2000 home until it has been identified. Painting is a different matter from removal, but check with your council before you start.

Ventilation

Livingetc quotes a decorator advising you to open your windows wide before painting^[1]. Temperature and ventilation also change drying times, so check the tin^[3].

Step by step

1. Clear and cover. Remove as much furniture as you can and cover the floor and fixed items with dust sheets^[3]. Switch off the power near fittings if you are working around them and cover sockets and switches^[3].
2. Clean. Surfaces must be clean, dust-free and fully dry^[3].
3. Fill and sand. Fill cracks and holes with proprietary filler and sand smooth once dry; vacuum the dust^[1]. Dulux does this before any paint goes on^[4].
4. Mask. Use masking tape or a paint shield on edges^[3]. Livingetc says prep and masking can take about a third of the time that the painting itself takes^[1].
5. Prime where needed. Seal stains first; use primer on bare surfaces and when you are covering a very different colour. New plaster needs a mist coat (next section).
6. Ceiling. Cut in the edges with a brush from steps, then roll the rest with a roller on an extension pole^[4]. At least two coats of ceiling-specific paint^[3].
7. Walls. Cut in the edges, working top to bottom, then roll the main area; use a long-handled mini-roller behind radiators^[4]. Reload the roller about every square metre, paint the first coat in one direction and the second in the opposite direction, and keep a wet edge to avoid a visible line^[3].
8. Woodwork. Dulux recommends two coats of woodwork paint on windows and doors, each dry before the next^[4]. For bare wood, Which? gives knotting solution, primer, one or two undercoats and one or two top coats^[3].
9. Skirting. Fill and sand any cracks, mask where the wall meets the skirting, and apply two coats^[4]. Splat gives two base coats before the walls and the final coat after they dry^[2].
10. Tape off and clean up. Livingetc says to remove masking tape after about an hour^[1]. Wash brushes and keep ventilation going until the room is dry.

How to cut in and how long to wait

Cutting in means painting the edges with a brush before you roll. Livingetc says to cut in a frame of two to three inches around the wall edges^[1]; Which? quotes decorator Adam Williams as saying to cut in first and then roll over the area by 10–20 mm^[3]. That overlap blends the brushed and rolled textures.

Waiting between coats is the step people skip. Which? says to leave four hours between coats to prevent peeling, that water-based paint can often be recoated within a few hours, and that oil-based paint typically dries overnight^[3]. Livingetc gives a minimum of two hours for walls, depending on the paint, and a quote from Annie Sloan that drying time between coats is the one issue you cannot speed up^[1]. Dulux simply says to let each woodwork coat dry^[4]. When these differ, follow the tin and use four hours as a safe default.

New plaster: the mist coat

New plaster is thirsty. The usual fix is a thinned first coat of emulsion, called a mist coat. The sources disagree on the thinning. Dulux says ten parts paint to one part water should work, and uses white emulsion thinned with water or Dulux Sealer for Plaster^[8]. Real Homes says around three parts paint to one part water^[9]. The chart shows the gap: about 9% water in the Dulux mix against 25% in the Real Homes one.

Drying time before you paint also differs. Dulux says plaster takes up to four weeks to dry completely^[8]; Real Homes says four weeks per 5 mm of plaster depth, and that the plaster is dry when it is a uniform light colour with no dark patches^[9]. After the mist coat, Real Homes allows about 24 hours and then two full undiluted coats, as Farrow & Ball advises^[9]. If your plaster is a lime or breathable finish rather than modern gypsum, follow the plasterer’s guidance instead; see lime plaster versus gypsum plaster.

Worked example: a 4 m by 3.5 m bedroom

Here is the arithmetic, with the coverage figure invented for the example. Read the real one off your tin.

• Ceiling: 4 × 3.5 = 14 m².
• Walls: perimeter 2 × (4 + 3.5) = 15 m; at 2.4 m high that is 36 m²; take off a door (about 2 m²) and a window (about 2 m²) = 32 m².
• Coats: two each. Ceiling 28 m²; walls 64 m².
• Paint: litres = area ÷ coverage. At an illustrative 13 m² per litre: ceiling 28 ÷ 13 = 2.2 litres (a 2.5 litre tin); walls 64 ÷ 13 = 4.9 litres (a 5 litre tin).

Time: Which? says an average room with preparation and two coats can take a full day or a weekend^[3], and Livingetc gives about two days for a single-colour room^[1]. The plan below uses a four-hour gap between coats and runs over three days, because the woodwork topcoats are done on their own so you can work around them.

Common mistakes

• Walls before ceiling. Ceiling drips land on finished walls^[1].
• Skipping prep. Fill, sand and vacuum the dust first^[1].
• Dry-sanding old paint. It can release lead dust^[6][5].
• Heating old paint. The sources differ; avoid it.
• Recoating too soon. Can cause peeling; leave about four hours^[3].
• Overloading the roller. Reload about every square metre^[3].
• Painting over new plaster without a mist coat. The plaster drinks the paint.
• Silicone in corners. Which? says use decorative caulk, not silicone^[3].
• Forgetting to vent. Open windows wide^[1].

Quick reference

Glossary

Cutting in

Painting edges and corners with a brush before rolling.

Wet edge

Keeping the painted edge wet as you move on, so no join shows.

Mist coat

A thinned first coat of emulsion on new plaster.

Undercoat

An opaque base coat on woodwork under the topcoat.

Knotting

A solution that seals resin knots in bare wood.

Overcoating

Painting over sound old paint without removing it; the BCF’s preferred approach for lead paint in good condition.

HEPA filter

A vacuum filter that traps fine dust.

What to do next

1. Find out when your house was built and when each room was last decorated.
2. Pick your finishes using our guide to paint finishes room by room.
3. Choose the ceiling colour with the ceiling colour guide.
4. If you have plaster ceiling roses or cornice, see how to paint a plaster ceiling rose.
5. Block out the days, and buy the paint using the arithmetic above.

Keep reading

• Matt, eggshell, satin or gloss: paint finishes room by room
• The fifth wall: ideas for painting the ceiling
• How to paint a plaster ceiling rose
• Colour drenching: how to paint a room in one colour
• Lime plaster vs gypsum plaster

Shop the look

Duchess Ceiling RoseBedside Wall Light

Frequently asked questions

What order do you paint a room in?

Prepare first, then the ceiling, then the walls, then woodwork (windows, doors and skirting). Which? states it as top down: ceiling, walls, woodwork, then areas near the floor.

Do you paint the ceiling or walls first?

Ceiling first, so drips and splatters can be covered when you do the walls. Some professionals do trim, walls, then ceiling for crisp seams on textured surfaces, but ceiling first is the default.

Should you paint skirting boards before or after the walls?

Sources differ. Dulux paints walls first and skirting after; Splat suggests two base coats on skirting before the walls and the final coat after they dry; some painters do trim before walls.

How long should you wait between coats of paint?

Which? says leave four hours between coats to prevent peeling; water-based paint can often be recoated within a few hours and oil-based paint typically dries overnight. Livingetc gives a minimum of two hours for walls. Check the tin.

How many coats of paint does a room need?

At least two. Which? says at least two coats on ceilings, and Dulux gives two coats on woodwork.

Can I sand old paint in a pre-1960s house?

Be careful: lead paint is likely in homes painted before the 1960s. Do not dry sand it; moisten the surface, use waterproof abrasive paper, keep children and pregnant women out, and consider a qualified decorator.

Is it safe to sand an Artex ceiling?

HSE says Artex can contain asbestos in buildings built or refurbished before 2000 and advises leaving suspected asbestos alone if in good condition and not doing DIY work on it. Get it identified before you sand or scrape.

What is a mist coat?

A thinned first coat of emulsion on new plaster. Dulux says ten parts paint to one part water; Real Homes says about three to one. Follow the tin.