Looking for a better deal on your insurance? Get a quote
Become a registered trader - Join us



Interiors & Decorating

Inspiration and advice on interior design, decorating styles, colour schemes and home aesthetics.

Interiors & Decorating

How To Prepare a Wall For Painting

When it comes to painting a room, preparation is key for a professional finish. If a wall has been previously painted and is in good condition, it will probably not need much preparation for painting, but it is important to fill in any cracks and holes before you start. Here is how to prepare a wall for painting in four simple steps:

When it comes to painting a room, preparation is key for a professional finish. If a wall has been previously painted and is in good condition, it will probably not need much preparation for painting, but it is important to fill in any cracks and holes before you start. Here is how to prepare a wall for painting in four simple steps:

  1. Tools and materials
  2. Stripping wallpaper
  3. Cleaning the wall and filling holes
  4. Filling cracks

How to prepare a wall for painting: tools and materials

Depending on the condition of your wall, you will need all, or some, of the following: wallpaper scorer; shave hook; wallpaper steamer; warm water and sponge; wire brush; sandpaper; sanding block; dust sheets; sugar soap; dusting brush; filling knife; filler; sealant; sealant gun; rubbish bags.

How to prepare a wall for painting: stripping wallpaper

The easiest way to strip wallpaper is with a steamer. First, lay your dust sheets over the floor and any bulky objects. Try to get as much of the paper as possible off by hand; particularly if the paper has a smooth sheen. Using a wallpaper scorer, score the wallpaper, to help the steam to penetrate to the porous, backing layer of wallpaper. Use the steamer, following the manufacturer’s instructions, or load your sponge with water and run it over the paper (you want to saturate the paper but don’t get the wall too wet!). Use your scraper to peel off the wallpaper, working your way along the wall.

How to prepare a wall for painting: wash the wall and fill in holes

Once you have stripped your wallpaper, wash the wall thoroughly with sugar soap and water to make sure you get rid of all of the adhesive. Give the wall a final rinse with water. If you spot any holes, clean them out using a dusting brush. Place a small amount of filler onto your filling knife and press it over the hole. Wait for the filler to dry completely before sanding over the filler until it is smooth and flat. If the filler isn’t dry, you will pull it out of the hole and could make it worse, so be patient!

How to prepare a wall for painting: filling cracks

The best way to fill cracks in walls is with caulk, a flexible filler that comes in a tube. This type of filler can’t be sanded, so you need to make sure it is perfectly smooth as you go. Dust the crack using your dusting brush. Applying even pressure to the trigger of your sealant gun, apply sealant to the length of the crack. Rub it in using a wet finger or a damp sponge (fingers work best!) until you have a smooth finish.

Some sealants are oil-based so you will need to apply an undercoat before you paint with emulsion; failure to use undercoat will cause the emulsion to crack. Once your walls are prepared for painting, you are halfway to a professional job. Now for the fun bit: you’re ready to get painting!

Looking for more interiors & decorating advice?

Find clear, practical answers to common interiors & decorating questions, helping homeowners understand everyday issues, know what checks they can carry out safely, and when it is best to contact a qualified professional.

  • What is the difference between a painter and a decorator?

    A painter focuses on applying paint - walls, ceilings, woodwork. A decorator does all of that but also handles wallpaper, specialist finishes, surface prep, and can advise on colours and materials. Many professionals do both and call themselves painters and decorators. For a straightforward repaint, a painter is fine. If you want wallpaper, something specialist, or someone to help you make decisions about the finish, go with a decorator.

  • How many coats of paint does a professional decorator apply?

    For most walls, it's a primer or mist coat, then two topcoats. New plaster, bare surfaces, or a big colour change might need more preparation or extra coats. Cutting corners on coats or using cheap paint are the most common ways to get a finish that looks fine at first and starts showing its age within a year. A trusted decorator always prepares the surface properly and won't rush between coats.

  • How do I prepare my home before a decorator arrives?

    Move furniture away from the walls and take down pictures, mirrors, and anything fixed to the walls. If you can strip old wallpaper yourself beforehand, it'll save time on site. Make sure every part of the room is accessible and well-lit. Talk through surface prep with the decorator in advance - a good one will tell you exactly what they need before they can start.

  • How do I know if my walls need replastering before decorating?

    If there are significant cracks, areas that sound hollow when you tap them, persistent damp, or large patches that are flaking or badly uneven - replastering first will give a much better result. Decorating over problem plaster looks fine initially but every imperfection tends to show through, especially with modern matt paints. A decorator can assess whether full replastering or careful preparation and skim coating will get you where you want to be.

  • What are the most popular interior design styles right now?

    There's been a pretty clear shift away from the all-grey, everything-neutral look of the 2010s. Warmer tones are dominating - clay, terracotta, stone, off-white - with natural materials like linen, rattan, and solid timber replacing high-gloss finishes. Biophilic design (plants, natural light, organic shapes) has gone from trend to standard practice. There's also a real appetite for spaces that feel personal and collected rather than showroom-ready - bold wallpaper, layered textiles, and period features being celebrated rather than painted over.

  • How long does a full home decorating project typically take?

    A single room in good condition typically takes a professional two to three days. A full house - particularly an older property that needs a little more care beforehand - can take several weeks. The part that often catches people off guard is the preparation: stripping wallpaper, filling, sanding, and priming all take a good amount of time, and doing them properly really does make all the difference to the finished result.

Have a question about TrustATrader?

If you have a question in relation to TrustATrader specifically, please check out the TrustATrader FAQs, with separate lists tailored to consumers and tradespeople. Alternatively, get in touch with our team. We're happy to help!