New Build Snagging: The Complete Guide for UK Buyers

Buying a brand-new home should mean moving into a pristine, perfectly finished property. The reality, unfortunately, is rather different. According to NHBC (National House Building Council) data, the average new build home has approximately 157 defects at handover — and that figure comes from a warranty provider with a vested interest in presenting the industry in a reasonable light. Independent surveys suggest the true number is often higher.

Snagging is the process of systematically identifying and recording defects before and after you take ownership, so you can require the developer to fix them at their expense. Done properly, it protects one of the largest investments you will ever make.

What Is Snagging?

A "snag" is any defect, incomplete item, or substandard finish in a new build property — from a misaligned door that does not close properly to cracked roof tiles or a boiler that fails to fire. Snagging covers everything from minor cosmetic issues (paint drips, uneven grouting) to serious structural or safety concerns (inadequate drainage falls, missing fire-stopping).

Historically, developers resisted allowing buyers access to inspect properties before completion. The Building Safety Act 2022, which came into force in October 2023, changed this: buyers now have a legal right to request a pre-completion inspection of their new home. This is one of the most important consumer protections introduced for new build buyers in recent years.

When to Snag

Pre-Completion Inspection

Request your inspection as soon as the developer notifies you that the property is ready. The Building Safety Act 2022 requires developers to allow this inspection before completion. Do not be pressured to waive this right or to complete "on the day" without an inspection.

Document everything with photographs and a written snagging list. Items identified at pre-completion can be formally logged for repair before you take possession, or as a prioritised list for the developer to address post-completion.

Post-Completion (2-Year Builder Defects Period)

Under the NHBC Buildmark warranty, the developer is responsible for repairing defects reported during the first 2 years after legal completion — the "builder's period." You do not need to prove negligence; you only need to show that the defect is a result of the developer's failure to build to the required standard. Report defects to the developer in writing, keeping records of all correspondence.

DIY Snagging vs Professional Inspector

You can carry out your own snagging inspection, but a professional snagging company will be more thorough — particularly for technical items such as roof void access, drainage falls, and Part L (energy efficiency) compliance.

Professional snagging inspectors are not regulated (unlike RICS-qualified surveyors), so choose carefully — look for inspectors who are members of the New Homes Quality Board or who have a background in construction project management or building control.

Room-by-Room Snagging Checklist

1. External — Roof and Structure

• Roof tiles or slates: all properly aligned, no cracked or missing units
• Ridge tiles and hip tiles: fully bedded and pointed
• Gutters and downpipes: correctly aligned, no sags, joints sealed
• Brickwork/render: no cracks wider than 1mm at mortar joints, consistent coursing
• DPC (damp-proof course): visible and not bridged by ground level or render

2. External — Doors and Windows

• All doors and windows open, close, and lock smoothly
• Draught seals in place and continuous
• External threshold: no trip hazard, weatherproof seal at base
• Double glazing units: no condensation between panes (sealed unit failure)

3. Entrance Hall and Stairs

• Staircase: no creaks, balustrade secure, spindle spacing ≤100mm (Building Regs Part K)
• Skirting boards: mitred joints tight, not gapped at walls
• Flooring: no hollow sections under tiles, even floor height between rooms

4. Kitchen

• Units: doors aligned, hinges adjusted, handles secure
• Worktops: joints tight, no gaps at upstand, no delamination
• Appliances: all installed and functioning (test oven, hob, extractor fan)
• Plumbing: check under sink for drips; check dishwasher supply and waste

5. Bathrooms and En-Suites

• Tiling: no hollow tiles (tap with knuckle), grout consistent, no cracking
• Sanitary ware: no chips, correct seals at bath/shower tray edges
• Ventilation: extractor fan working, ducted externally (not into loft void)
• Drainage: pour a bucket of water into shower tray — does it drain within 60 seconds?

6. Bedrooms

• Built-in wardrobes: doors aligned, hanging rails secure
• Windows: trickle vents present and open/close correctly
• Electrical: all sockets and light fittings functional, plates flush and square

7. Electrical Throughout

• Consumer unit: RCDs and MCBs correctly labelled
• All sockets, switches, and light fittings functional
• Smoke alarms and CO detectors: present, correctly located, tested
• EICR (Electrical Installation Condition Report): request a copy — it should be provided with the new build

8. Heating and Hot Water

• Boiler or heat pump: fires correctly, pressure correct, no leaks at joints
• Radiators: all heat up evenly; thermostatic radiator valves (TRVs) fitted
• UFH (if fitted): all zones function; screed fully dried before flooring laid

9. Loft Space

• Insulation: at least 270 mm of mineral wool across the whole loft floor
• Structural timbers: no splits, no damaged rafters
• Water tank (if present): insulated, no leaks, overflow pipe in place

10. Drainage and Groundworks

• Inspection chambers: accessible, covers secure at ground level
• Drainage falls: water should not pond on patios or driveways
• Garden grading: surface water drains away from the house

Most Common Snags in New Builds

The NHBC Buildmark Warranty

Most new builds in England and Wales are covered by the NHBC Buildmark warranty, one of the most widely recognised new build warranties in the UK:

• Years 1–2 (Builder's Period): The developer is responsible for putting right any defects caused by their failure to build to NHBC's technical standards. Notify the developer in writing.
• Years 3–10 (NHBC Period): NHBC takes over responsibility for major structural defects and certain physical damage. Minor defects are the buyer's responsibility from year 3 onwards.
• NHBC Resolution Service: If the developer fails to respond to your snagging list within a reasonable time, NHBC operates a resolution service. You can escalate to NHBC directly if the developer is unresponsive.

Other warranties include Premier Guarantee, LABC Warranty, and Build-Zone, which operate under similar 2+8 year structures.

Part L Compliance Check

Building Regulations Part L (Conservation of Fuel and Power) sets energy efficiency requirements for new homes, including minimum U-values for walls, floors, and roofs, and an air-tightness test. Ask the developer for:

1. The Air Tightness Test Certificate (required for all new builds)
2. The SAP Calculation (energy performance prediction)
3. Confirmation of insulation depths, particularly in the loft

Shortfalls in Part L compliance are a serious defect — not a cosmetic snag — and must be addressed by the developer.

Escalation: What to Do if the Developer Doesn't Fix Defects

1. Write to the developer with a formal snagging list and a reasonable deadline (typically 14–28 days for non-urgent items, 24–48 hours for urgent safety issues).
2. Escalate to NHBC (or your warranty provider) if the developer fails to respond or refuses to accept responsibility.
3. Contact the New Homes Ombudsman — established under the Building Safety Act 2022, the NHO handles complaints about developers who are members of the New Homes Quality Board.
4. Small claims court for items the developer refuses to fix costing under £10,000 (court fee from £35).

Reservation Fee and Contract Red Flags

Before you even start snagging, protect yourself at the contract stage:

• Reservation fee: typically £500–£2,000, but should be refundable if the developer fails to exchange within an agreed period. Check the terms carefully.
• Longstop date: your purchase contract should include a longstop date — the latest completion can occur — after which you can withdraw and recover your deposit.
• "Fitted to specification" clauses: ensure the contract specifies exactly what finishes, appliances, and fittings are included. Vague specifications allow developers to downgrade.
• Snagging access clause: some contracts attempt to restrict your access for pre-completion inspections. This is now in conflict with the Building Safety Act 2022 rights.

For context on building standards generally, our guide to building regulations: full plans, building notice, and regularisation explains what Building Control inspectors check during construction — and why an inspector's sign-off does not guarantee a defect-free build.

Renovate Me provides step-by-step snagging guides for new build buyers — from pre-completion inspection through the 2-year defects period — so you can document defects systematically and get every last one fixed.

For the legal side of the new build purchase process — from reservation fee and developer contract red flags to leasehold ground rent traps and the Building Safety Act pre-completion inspection right — see Conveyancing for New Builds vs Resale Properties: Key Differences.