New build properties regularly disappoint buyers who discover significant defects after moving in. Professional snagging inspectors find an average of 100–160 issues per property. Here are the 20 most commonly found defects in new build properties in 2026 — and why they matter.
Cosmetic Defects (very common but important)
- Scratched or damaged windows and glazing — often caused by construction debris
- Poor paint finish — runs, holidays (missed patches), wrong colour, inadequate coverage
- Damaged kitchen units and worktops — scratches, chips, misaligned hinges and drawer runners
- Tile alignment and grouting — crooked tiles, uneven grout joints, hairline cracks in grout
- Poorly fitted skirting boards and architraves — gaps, uneven joints, inadequate fixing
Building Fabric Defects (significant)
- Cracks in plasterwork — fine cracks are normal; wider cracks above door frames may indicate structural movement
- Uneven or squeaking floors — inadequate fixing of floor decking
- Poor external brickwork — mortar smears, inconsistent pointing, cracked bricks
- Damaged or missing roof tiles — often caused during construction traffic
- Inadequate loft insulation — below required depth or coverage, particularly at eaves
Mechanical and Electrical Defects (serious)
- Boiler pressure or controls not set up correctly
- Electrical sockets not level or incorrectly wired
- Bathroom extractor fan not connected or insufficient
- Heating system not commissioned — thermostatic radiator valves not balanced
- Smoke and CO detectors not tested or in wrong position
Fire Safety and Structural (critical)
- Missing or incomplete fire stopping between plots — potentially serious safety issue
- Inadequate party wall sound insulation
- External drainage not connected or flowing incorrectly
- Cavity wall drainage poorly installed
- Air bricks or ventilation grilles blocked or incorrectly positioned
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