What you'll need
Plasterboard walls need a different approach (skim coat over PVA-primed board). Full depth replastering of walls is technically demanding — most DIYers are better served by patching and lining with plasterboard.
Step-by-step guide
- Prepare the surfaceOld plaster must be sound and firmly attached. Tap the wall — a hollow sound means the plaster has blown and needs removing. Remove all loose plaster back to brick or block. Clean off dust with a brush.
- Apply PVA adhesiveMix PVA (1 part PVA to 4 parts water) and paint it onto the surface. Let it go tacky but not fully dry — you want it sticky, not sealed. PVA controls suction so plaster doesn't dry too fast.
- First coat (scratch coat / bonding)Mix bonding plaster to a smooth peanut butter consistency. Apply to the wall with the trowel in upward sweeping strokes, building up to approximately 8-10mm. Once applied, score it with a scratching comb in a crosshatch pattern. This gives the finish coat something to grip. Leave to firm up for 20-40 minutes.
- Second coat (finishing plaster)Mix finishing plaster to a smooth, creamy consistency. Apply over the scratch coat in two thin layers — the first as soon as the scratch coat has firmed, the second once the first has started to go off. Work quickly in sections.
- Polish the surfaceThis is where plastering skill shows. As the plaster firms (it will start to pull when you trowel it), flatten and polish using increasing pressure. Splash small amounts of clean water onto the surface to rehydrate the face and allow polishing. A professional does multiple passes until the surface is flat and smooth.
- Leave to dry fullyNew plaster takes 2-4 weeks to dry completely. It turns from dark grey to a pale cream colour when dry. Do not paint until fully dry or the moisture will cause the paint to peel.
For room-sized plastering, hire a professional plasterer. A day's labour is £250-400 and the result is infinitely better than a DIY attempt. Use your energy on the preparation (removing old plaster, fixing walls) to save money.
Expert tips for the best result
- The trowel angle matters more than anything — too steep tears the plaster, too flat and you can't spread it
- Mixing the right consistency is 80% of success — too stiff and it won't spread, too wet and it won't hold
- Small areas of fresh plaster always dry faster than surrounding older plaster — use less PVA on patches to slow the suction
- A plasterer's hawk needs to be held close to the wall — reaching out tires your arm and reduces control
- Practice on a scrap board first — the motion and pressure needed is entirely a muscle memory skill
Useful tools and products
When to call a professional builder
Any room-sized plastering, external render, lime plastering in period properties, or if the reason for replastering is rising damp (the damp must be fixed first).
We connect you with vetted local builders across the UK — fast response, free quotes, guaranteed work.
💬 Get a free quote via WhatsAppFrequently asked questions
How difficult is how to plaster a wall for a beginner?
This guide is rated Hard. Plastering is the trade that most professionals say takes the longest to master. A small patch repair is achievable for a patient DIYer; plastering a full room to a smooth finish requires significant If you're not confident, a professional builder can do this quickly and provide a guarantee on the work.
How long does how to plaster a wall take?
Allow Full day (plus drying time). This assumes the tools and materials are ready before you start. First-timers should budget extra time for preparation and any unexpected issues.
How much does a builder charge for this in the UK?
Most builders charge £40-80 per hour depending on location and complexity. For a straightforward job like this, expect 1-2 hours of labour plus materials. Get a fixed quote via WhatsApp — message us with your postcode and job details.
How do I find a reliable builder near me?
WhatsApp us with your postcode and job description. We match you with a vetted local builder from our network — most jobs get a response within the hour. Contact us here.