DIY or Hire a Plasterer?

DIY makes sense for filler work (cracks, small holes), bonding-coat patch repairs (under 0.5m²) and very small plasterboard skim attempts on a single small wall in a non-prominent room. Hire a pro for any whole-room skim coat, ceiling work (gravity makes ceilings harder than walls; pros do ceilings first, walls second), backing-coat-and-skim on bare brick or breeze block, and any work that has to be paint-ready in a defined timeframe. The cost-vs-finish gap is the largest of any UK home trade — DIY plaster typically saves £200-£400 of labour and produces a finish that is visibly amateur even after paint. Most homeowners who try DIY plastering end up paying a pro to skim over the DIY work.

1. Whole-room skim coats — multi-finish has a 30-90 minute working window; a single beginner cannot keep pace across a wall before set, leaving permanent ridges
2. Ceiling work — gravity makes ceiling plaster much harder than walls; even competent DIY-ers cannot reach pro standard on a ceiling
3. Bare-brick or breeze-block backing coat then skim — the two-stage backing-and-finish is a 24-hour build with timing tolerances measured in minutes

Plastering itself is unregulated. The relevant rules are around lath-and-plaster ceilings in older homes (lifting an old lath-and-plaster ceiling can disturb asbestos in the original lime mix; pre-2000 buildings should be tested before any disturbance), and Listed-building specifications (lime plaster vs gypsum plaster matters on listed properties — gypsum on a lime building can trap moisture and damage the structure). For party walls between attached homes, the Party Wall etc. Act 1996 may apply if the plastering exposes structural elements.

Honest summary: On crack-filling, DIY saves £80 callout. On any room-scale skim, the DIY-then-pay-a-pro-to-redo pattern is so common that pro-first is almost always the cheaper outcome.