“A smooth wall” means different things to different people. On a commercial build, a specified finish level gives the builder, plasterer and painter a clearer starting point. The lighting and the final paint finish need to be part of that discussion.

What do Levels 4 and 5 describe?

They describe plasterboard finishing requirements. GIB’s guidance generally associates Level 4 with less demanding lighting and appropriate lower-sheen decoration. It recommends Level 5 for higher-sheen or dark finishes, and for certain finishes exposed to critical lighting.

Use the project specification and manufacturer guidance to decide what is required in each area.

Technical reference: GIB: Achieving a quality finish ↗

Why does lighting matter?

Light falling along a wall can make small surface variations more visible. This is often called critical or glancing light. Large windows and the position of fittings are worth discussing before the finishing scope is settled.

Look at the intended room layout and lighting plan together. If the finished room will have a long, brightly lit wall, raise it while the work can still be planned.

Level 5 still needs realistic expectations

GIB explains that Level 5 adds a full-surface skim treatment and additional requirements. The skim helps even out surface porosity; it is not a way to straighten an uneven wall. Even a well-finished surface can show variations under critical light.

Agree the specified system and how the finish will be reviewed at handover.

Technical reference: GIB: Achieving a Level 4 or 5 finish ↗

What should go into the enquiry?

Send enough detail for the stopping and painting work to be considered together. If some rooms need a different finish, identify them rather than applying one description to the whole building.

  • Plans showing the areas to be finished.
  • The specified finish level for each area.
  • Proposed paint colour and sheen, if decided.
  • Windows, feature lighting and other critical-light concerns.
  • The programme and expected handover between trades.

Settle the details before the quote is final

A late change to colour, sheen or finish requirements can change the work being asked for. Keep those decisions in the written scope and tell the project team when they change.

Andrew can discuss commercial painting and plastering together, including Level 5 where it is specified and agreed for the job.

THE USEFUL BIT

Decide the finish level with the lighting and paint system in mind. Agree it before the plastering and painting scope is locked in.

Your building.
Your next step.

Share the location and a few details. Andrew can talk through the job with you.

Discuss your plastering and painting scope ↗Commercial painting & plastering ↗