Patchy Paint, Roller Marks and Walls That Look Wavy: What Is a Defect and What Is Not
Wall finish is the most-flagged defect at handover and the one builders push back on hardest. How to tell a genuine workmanship defect from normal variation, the IS 1077 and IS 1542 tolerances that settle the argument, and what a proper rectification looks like.
Updated · 6 min read · by HomeGyan certified engineers
The short answer
- Wall and paint finish is the single most commonly flagged item in a handover inspection, and the one most often dismissed as "normal" by site teams. It is usually not.
- A wall should be plumb within about 1 in 250 over storey height — roughly 12 mm over 3 m (IS 1077). Beyond that the wall is out, and paint will never hide it.
- Plaster should stay within about ±3 mm under a 3 m straightedge (IS 1542 / IS 1661). A wall that shows waves under a torch held flat against it is a plastering defect, not a painting one.
- Patchy colour, roller lap marks and visible putty patches mean coats were skipped or applied over a surface that was not ready — the fix is re-coating the full wall, never a touch-up patch.
- Insist the fix is done wall-to-wall between corners. A patched repair in the middle of a wall will always read as a patch once the light changes.
Why this is worth arguing about
Paint is the last trade on site, which means it is the trade under the most schedule pressure. Coats get skipped, putty goes on over damp plaster, and surfaces are painted before they have properly cured. None of that is visible on the day it is finished — it shows up in the first month as patches, flaking or a wall that catches the light unevenly.
It also matters because paint hides the trade underneath it. A wall that looks wavy is almost never a painting problem; it is a plastering problem that painting was asked to conceal. Repainting will not fix it, so identifying which of the two you are looking at decides whether the builder owes you a coat of paint or a re-plaster.
Telling a plaster defect from a paint defect
Hold a torch flat against the wall so the beam rakes across the surface rather than hitting it straight on. This is the single most useful test and takes seconds.
- Long, soft shadows that move as you move the torch: the plaster is undulating. That is a plastering defect and repainting will not touch it.
- Sharp-edged patches, visible rectangles or halos: putty or filler applied locally and not sanded back. A paint-stage defect.
- Stripes running in one direction: roller lap marks from painting over a partially dried coat. A paint-stage defect.
- Colour that changes between the middle of the wall and the corners: usually an under-coated wall, or two batches of paint mixed differently.
- Fine cracking in a spider pattern: shrinkage in the putty or plaster, often from application that was too thick or dried too fast.
What the standards actually say
| What is being checked | Reference | Tolerance |
|---|---|---|
| Wall plumb over storey height | IS 1077 | About 1 in 250 — roughly 12 mm over 3 m |
| Plaster flatness under a straightedge | IS 1542 / IS 1661 | Within about ±3 mm under a 3 m straightedge |
| Corners square and true | IS 1077 | Corners should read square; visible splay is a defect |
What a proper rectification looks like
- Surface prepared back to a sound base — loose putty removed, not painted over.
- Primer applied, then a minimum of two finish coats. One coat over a patch is not a fix.
- Work taken wall-to-wall between natural breaks (corner to corner, floor to ceiling). Stopping mid-wall guarantees a visible edge.
- Same batch of paint across a wall. Different batches of the same shade can differ enough to see.
- Re-inspection after the paint has fully dried and in daylight, not under site lighting.
What it costs if you end up paying
Inside the defect liability period this is the builder's cost, not yours. If you are past that window or dealing with a resale, a room-level repaint is usually the cheaper end of a snag list, while a re-plaster is considerably more because it pulls in curing time and a fresh paint cycle on top.
The order matters: never accept a repaint on a wall that has a plaster or dampness problem underneath. You will pay for the paint twice.
Frequently asked questions
The builder says patchy paint is normal and will settle. Is that true?
No. Paint does not settle. Colour variation, lap marks and visible putty patches are application defects and they stay exactly as they are. What can change is dampness behind the paint, which gets worse rather than better.
Can they just touch up the patch instead of repainting the wall?
A touch-up in the middle of a wall will read as a patch under any raking light, because the new paint differs slightly in sheen and age. Ask for corner-to-corner coverage. It is a reasonable request and standard practice for a defect rectification.
How do I know if the wall is wavy or I am imagining it?
Use a torch held flat to the wall, and if you want it settled beyond argument, a 3 m aluminium straightedge. Gaps under the straightedge beyond about 3 mm are outside IS 1542 guidance and are a documented defect rather than a matter of opinion.
Should I get this fixed before or after moving in?
Before, if you can. Once furniture is in, painters work around it, coverage suffers, and the builder gains an argument about whether the damage was theirs. It is also far easier to prove a defect existed at handover than to raise it six months later.
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