Jobs that are usually fine to DIY
Small, straightforward marks are often reasonable to tackle yourself with basic tools and a bit of patience. This typically includes single nail or screw holes, minor surface scuffs, and small pre-existing dents that only need a light fill. A putty knife, a quality ready-mixed filler, fine-grit sandpaper and a sealing primer before painting will usually get a tidy result on jobs like this.
Where DIY repairs commonly go wrong
The most common problem is not the fill itself but the finish around it. A patch that is not feathered out wide enough often shows as a slightly raised or textured halo once paint goes on, especially under raking light from a window or downlight — a look tradespeople call flashing. Using the wrong product for the substrate is another frequent issue: plasterboard, solid plaster and lath-and-plaster all behave differently, and a filler suited to one may crack or debond on another. Skipping a proper seal coat before painting, and repairing a crack without addressing why it appeared (movement, moisture, a loose fixing) are the two reasons a DIY repair often needs doing again within a year.
Signs a job needs a professional
A few situations are worth calling a professional plasterer for rather than attempting yourself. Holes larger than roughly a clenched fist usually need new backing material behind the plasterboard, which is harder to get right without experience. Cracks that keep coming back after a repair often point to an underlying cause that needs assessing rather than re-filling. Anything involving water damage should be treated carefully — affected plaster can extend well beyond the visible stain, and the moisture source needs to be resolved before any repair is done. Ceiling work is generally a bigger job than it looks, with access, overhead dust and finish quality all harder to manage safely from a ladder. Cornice damage is also difficult to match well without the right tools and experience, particularly on older, decorative profiles.
A simple way to decide
| Factor | Lean DIY | Lean professional |
|---|---|---|
| Size | Small, isolated hole or mark | Larger area, multiple repairs |
| Location | Wall, out of direct light | Ceiling, feature wall, hallway sightline |
| Cause | One-off impact (picture hook, furniture) | Recurring crack, water damage, movement |
| Finish needed | Hidden or low-visibility spot | Painted feature area, pre-sale presentation |
If you are weighing up a plaster hole repair or a larger patch repair and are not sure which side of that table your job falls on, sending a couple of photos is usually the fastest way to find out. See the cost guide for what typically affects pricing once you do call someone in.
Get it assessed properly
Plastermate is set up specifically for the small-to-medium repair jobs this guide covers — holes, patches, ceilings and touch-ups before painting. Call for a straightforward assessment before you decide which way to go.