Repairing shrinkage cracks too early, or with the wrong material, is why so many new-build owners end up filling the same crack two or three times in as many years. Get the timing and the material right and it's a one-off job.
Before any repair, it's worth being confident the crack is genuinely shrinkage and not something else masquerading as it, because the repair approach is different.
Confirming the diagnosis before repairing
Ideally, the crack has been monitored through at least one full heating cycle and confirmed as hairline and static, following a joint line rather than running diagonally across a wall. Any crack accompanied by sticking doors, sloping floors or cracking outside the property needs ruling out as structural before it's simply filled.
The right sequence of works
Timing matters as much as technique here. Repairing too soon, before the bulk of the drying and shrinkage has happened, just means the same crack reopens once the remaining moisture leaves the fabric.
- Let the property go through at least one full heating season, ideally the first two, before carrying out redecoration repairs
- Rake out the crack lightly rather than simply skimming over it, so filler has something to key into
- Use a flexible, movement-tolerant filler at genuine movement points, rather than a rigid filler that will crack again
- Redecorate once the filler has cured, matching texture and finish to the surrounding surface
Why a quick cosmetic fill fails
A rigid filler applied too early, before the building has finished drying, simply cracks again along the same line once more moisture leaves the timber and plaster. This is the single most common reason shrinkage repairs need repeating — the material and the timing were both wrong.
Interfaces with other trades
Where shrinkage cracking coincides with a door binding or a window not closing cleanly, it's worth having the joinery adjusted at the same time, since both symptoms often trace back to the same seasonal timber movement.
How you know the repair has worked
A correctly timed and executed repair should hold through subsequent heating seasons without the crack reopening along the same line. If a filled joint cracks again within a year, that's a sign either the repair was done too early or the underlying movement hasn't actually settled, in which case it's worth a second look before repeating the same fix.
Common questions
What filler should be used for shrinkage cracks?+
A flexible, decorator's filler designed for movement is the right choice at genuine joint lines, rather than a rigid, hard-setting filler that has no give as the materials continue to move slightly with the seasons.
Can I do this repair myself?+
Filling and redecorating hairline shrinkage cracks is straightforward and commonly done by homeowners. The part that needs a trade eye is confirming the crack is genuinely shrinkage and not an early sign of something structural.
Should I wait for every crack to appear before fixing any of them?+
It's reasonable to do one thorough redecoration pass after the first full heating season rather than chasing each crack individually as it appears, since new ones will likely keep showing up until the drying process is largely complete.
Get a written quote for a snagging and repair pass
We'll confirm the cracks are genuine shrinkage, then carry out a proper repair and redecoration pass timed to actually last.