The number of coats you need is one of the most important parts of a decorating estimate because coats determine time and materials. Many people assume one coat is enough, but in most cases a single coat is not a reliable standard for an even, durable finish.
For previously painted walls in a similar colour, two coats is the most common expectation. One coat can sometimes look acceptable in low light, but it often shows patchiness when the room is bright or when light hits the wall at an angle.
If you are changing colour, especially moving from a strong colour to a light neutral, you may need more than two coats. Deep colours can show through, and certain pigments can be harder to cover, even with high-quality paint. In these situations, the right primer or undercoat can reduce the number of finish coats required and improve consistency.
Fresh plaster is a special case. New plaster is porous and will absorb paint. A mist coat or sealer is typically needed before finish coats, otherwise the top coat can dry unevenly and have poor adhesion. Once the surface is sealed correctly, two finish coats usually follow.
Stains and problem areas also affect coat count. Water marks, nicotine staining, and certain types of discolouration often require stain blocking primer. Without it, stains can bleed through multiple finish coats, wasting both time and paint.
The best approach is to treat coat count as part of the specification, not an assumption. A good quote should state how many coats are included and whether primer is included where needed. That makes the price more meaningful and reduces the risk of extra charges later.
If you want help working out a realistic coat plan for your project, contact P&D Online.