At a glance
Painting a room looks straightforward but produces wildly variable results depending on how thoroughly the preparation has been done and how well the paint is applied. The difference between a finish that looks professional and one that looks amateur almost always comes down to the same factors – inadequate surface preparation, skipping the primer on new or bare surfaces, using a poor quality brush for cutting in, and not allowing adequate drying time between coats. Get these right and the actual painting is the easiest part of the job. Get them wrong and no amount of careful application will compensate.
A full room repaint in UK homes typically involves ceiling, walls and woodwork – three different paint types, applied in a specific order, each with its own surface preparation requirements. The ceiling goes first, walls second, woodwork last. This order is not arbitrary: it allows ceiling drips to be covered by wall paint and wall splashes to be covered by the final woodwork coat, minimising the precision needed at each stage. Before any paint goes on, every crack, hole and imperfection in the surface should be filled – including any remediation of previous DIY issues. If walls have just been plastered, they need time to dry fully and a mist coat of diluted emulsion before any topcoats are applied.
Choosing the right paint
Matt emulsion is the standard choice for walls and ceilings in living rooms and bedrooms – it hides surface imperfections better than sheen finishes because its flat surface does not reflect light to reveal texture. The trade-off is that it is less washable than higher-sheen finishes, which matters in hallways, children’s rooms and kitchens where the walls take more direct contact. Eggshell emulsion is the practical middle ground – a low sheen finish that is more resistant to marking and scuffing than matt but far less obviously shiny than satin. It is well suited to any room that needs to be both attractive and durable. For woodwork, skirting boards, door frames and window sills, a water-based satin or eggshell is the modern preference over traditional oil-based gloss – it dries faster, yellows less over time, and can be washed out of brushes with water.
Preparation – the step that matters most
Good preparation takes more time than the painting itself and is what separates a lasting professional finish from one that looks good initially but starts showing defects within months. Every crack, dent and hole should be filled with a ready-mixed interior filler, allowed to dry fully and then sanded flat with fine-grit sandpaper. Pay particular attention to nail holes from picture hooks, screw holes, hairline cracks at ceiling and wall junctions, and any areas where old filler has shrunk or cracked. Large cracks or damaged areas should be cut out with a filling knife, undercut slightly to give the filler a mechanical key, and built up in layers if the depth requires it.
Wash walls with sugar soap solution before painting – particularly in kitchens where grease builds up invisibly on all surfaces, and in any room where a smoker has lived. Grease and nicotine contamination cause paint to peel and fail regardless of how many coats are applied. Sand any existing glossy surfaces lightly with 120-grit sandpaper to provide a key for the new paint. Fill any gaps between skirting boards and walls with flexible decorator’s caulk rather than rigid filler – a rigid fill cracks again when the timber moves with changes in humidity, while a flexible caulk accommodates this movement. Fix any maintenance issues – a dripping tap or moisture source from a leaking shower should be addressed before decorating, not after.
How to paint – step by step
Protect floors, furniture and fixtures
Remove everything possible from the room. Cover what remains and the entire floor with dust sheets – proper woven cotton dust sheets rather than thin plastic, which slides, tears and allows paint to seep through. Tape dust sheets to the base of skirting boards. Remove switch and socket faceplates where possible and mask light fittings. Use low-tack masking tape along window glass edges.
Fill, sand and prime all surfaces
Fill all cracks, holes and imperfections, allow to dry fully, then sand smooth with 120-grit paper. Wipe down all surfaces with a damp cloth to remove dust. Apply a coat of primer or diluted emulsion (10% water) to any bare plaster, bare wood or heavily patchy areas – paint applied without a prime coat over bare surfaces soaks in unevenly and the colour never looks right regardless of how many topcoats follow.
Paint the ceiling first
Cut in around the ceiling perimeter with a 50mm angled brush, working a band approximately 100mm wide around all edges. Then fill the main area with a 9-inch roller using a medium pile sleeve (10-12mm). Work in overlapping W or M shapes rather than straight stripes to avoid visible roller lines. Apply two coats, allowing full drying time between – typically two to four hours for emulsion in normal UK temperatures.
Paint the walls
Cut in around all edges – ceiling line, corners, around windows and doors, and above skirting boards – before rolling. Keep the cut-in band narrow – 75-100mm – and aim for a clean, straight line at the ceiling. Roll the main wall areas in overlapping V shapes, working from the top of the wall downward. Maintain a wet edge to prevent lap marks. Two coats minimum, three on previously dark or bare surfaces.
Paint woodwork last
Sand all previously painted woodwork lightly with 120-grit to provide a key. Apply satin or eggshell with a 50mm flat brush, working with the grain of the wood on timber surfaces. Work methodically around the room – skirting boards first, then architraves, then window frames, then doors. Apply two coats, lightly sanding between coats with 180-grit for a smooth finish. Remove masking tape while the last coat is still slightly tacky to avoid peeling.
Cutting in and rolling technique
Cutting in is the technique of painting a clean edge along ceiling lines, corners and around woodwork using a brush before filling the main surface with a roller. It is the skill that separates a neat finish from a messy one, and it improves significantly with practice. Load the brush so that approximately a third of the bristle length carries paint – too much and it drips, too little and the brush drags and skips. Hold the brush like a pen rather than a hammer, using the angled tip to draw a clean line by pressing the bristles lightly against the surface and drawing the brush steadily along.
The most common mistake with cutting in is working too slowly and allowing the cut-in strip to dry before the roller follows. If the rolled area is applied over a fully dry cut-in band, the junction often shows as a visible line where the textures differ – the brush-applied paint has a slightly different texture to rolled paint, and the dried junction accentuates this. The ideal is to cut in a section of wall and immediately roll up to and slightly over the wet cut-in band, blending the junction while both are still wet. Work in manageable sections – one wall at a time – rather than cutting in the entire room and then rolling.
Never paint over damp walls. Moisture trapped beneath paint causes blistering, peeling and mould growth that can ruin a decoration job within months. If walls feel cold and slightly damp – common in poorly ventilated UK rooms in winter – ventilate and heat the room for several days before painting. Identify and fix the source of any damp before applying any paint. Painting over damp is the most common cause of premature paint failure in UK homes and cannot be remedied without stripping the affected areas back to bare plaster.
Painting woodwork and trim
Woodwork requires more preparation than walls because the existing finish is typically hard gloss or satin that new paint will not adhere to without a mechanical key. Sand the entire surface with 120-grit to dull the sheen – this does not need to remove the old paint, just scuff the surface enough for the new coat to grip. Wipe down with a tack cloth to remove all sanding dust. On bare or previously unstained wood, apply a wood primer or undercoat first – skipping this step over bare timber results in uneven absorption and a blotchy final appearance regardless of the number of topcoats.
Water-based satin and eggshell products have largely replaced traditional oil gloss for interior woodwork in UK homes. They dry much faster – typically two to four hours rather than overnight – do not yellow over time as oil-based products do, and are far easier to clean up. The finish is slightly less hard and shiny than traditional oil gloss, which most decorators consider an advantage rather than a drawback. Apply with a good quality 50mm synthetic bristle brush using long, even strokes with the grain, finishing with very light strokes in one direction to lay the surface flat and remove brush marks.
Common problems and solutions
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