Snag List Template UK 2026: The Complete Room-by-Room Guide

A snag list is the document handed across at the end of a UK construction job that decides whether the buyer signs off, retention is released, and the team moves on. Get it right and the handover is clean. Get it wrong and you spend the next year fixing items that should have been resolved before the keys changed hands.

This guide walks through the modern UK snag list end to end: the four defect categories every list should use, the master pre-walk checklist, the room-by-room templates, and the workflow from snag to retention release.

The Four UK Defect Categories

A weak snag list lists everything as if it carries the same weight. A strong snag list separates by severity so the developer can prioritise. Use these four categories recognised by NHBC, LABC and Premier Guarantee on every list.

Category A: Defects That Prevent Handover

Items that mean the property is not legally or safely fit for occupation. Examples: no working hot water, smoke alarms not fitted, front door does not lock, boiler not commissioned, roof leaking. Any Category A item means the buyer can refuse completion until it is fixed.

Category B: Defects Affecting Normal Use

The buyer can move in but daily life is disrupted. Examples: internal door binds and will not close, tap drips when closed, radiator does not heat evenly, kitchen cupboard door does not close flush. Standard JCT contracts require these resolved in the defects liability period, typically 12 months from practical completion.

Category C: Cosmetic and Finish Defects

The property functions as designed but the finish quality falls below the contracted specification. Examples: paint splash on carpet, plaster crack above doorway, tile grout uneven, skirting paint missing. These are governed by NHBC Standards Chapter 1.1 and the Consumer Code for Home Builders.

Category D: Items to Monitor

Not currently defects but flagged in case they worsen. Examples: hairline plaster crack expected to settle, slight movement in MDF stair newel, damp meter reading slightly above threshold. Recording these protects the buyer if the item later develops into a defect.

The Master Pre-Walk Checklist

Before you tick a single box, do these 11 things:

1. Confirm date and time of the walk in writing with the developer.
2. Confirm who will be present (site manager, customer-care rep, buyer or snagger).
3. Bring contract documents: specification, drawings, schedule of works, finishes schedule.
4. Bring printed room templates, one per room.
5. Bring a camera, torch, tape measure, spirit level, and a 6mm feeler gauge (the NHBC standard for door gap tolerance).
6. Bring a pinless damp meter, available for under £30 at any UK builders merchant.
7. Bring a socket tester for all UK 13 amp sockets.
8. Bring fresh batteries for smoke alarms and carbon monoxide alarms.
9. Bring a notepad even if you are using a digital system.
10. Allow 90 minutes for a 2-bed flat, 2 hours for a 3-bed house, 3 hours for a 4-bed detached.
11. Eat before the walk. Low blood sugar makes you miss things.

Room-by-Room Template Structure

The full Pro Playbook contains 14 room-by-room templates. Each template checks the same nine categories in the same order, so nothing is missed across the property:

• Ceiling: plaster surface, cracks, staining, cornice, light centring.
• Walls: paint coverage, filler lines, skirting, architraves, behind radiators.
• Floor: covering matches spec, no lippage at thresholds, level using a 2m straightedge, no squeaks.
• Doors: swing free, 6mm gap maximum top, 8mm bottom, handle level and tight.
• Windows: open fully, restrictor on first floor and above, mastic seal continuous.
• Sockets and switches: count matches the schedule, every socket tested with the tester.
• Heating: radiator level, thermostatic valve operates, full surface heats up.
• Plumbing (where relevant): tap function, no drip when closed, waste seats correctly, no leak after a five-minute fill test.
• Joinery and finishing: cabinet doors flush, drawers smooth, hinges secure.

The Handover Documentation Pack

On the day of handover the buyer should leave with a folder containing at minimum:

• Building Control completion certificate
• Energy Performance Certificate dated within the last 12 months
• NHBC, Premier Guarantee, LABC or equivalent warranty certificate
• Gas Safe commissioning certificate for the boiler
• EICR or domestic electrical installation certificate
• Operating manuals for every appliance
• Paint codes and colour reference for every room
• Floor covering, tile, kitchen unit and brick references with supplier contacts
• Stopcock, gas meter, and electricity meter location plans
• Emergency contact numbers and the defects reporting procedure

If any item is missing at handover, do not sign the completion paperwork until the developer provides it in writing within 72 hours.

Snag to Retention Workflow

Retention is the percentage of the contract sum held back until snags are resolved. On most JCT contracts this is 3 percent, with half released at practical completion and half at the end of the defects liability period.

The standard workflow:

1. Site manager produces the contractor's clearance list.
2. Client walks independently and produces their own list.
3. The two lists are merged into one master defect schedule.
4. The contractor agrees the schedule and commits to timescales in writing.
5. Practical completion is signed when no Category A items remain.
6. First half of retention is released.
7. Contractor closes out the schedule over the defects liability period.
8. Final inspection at the end of the period.
9. Remaining items valued, deducted, and balance of retention released.

When the Developer Refuses to Fix Items

If standard escalation fails, the route is:

1. Developer's customer-care manager (not the site manager).
2. Developer's head office, written complaint.
3. Warranty provider dispute resolution (NHBC, Premier Guarantee, LABC).
4. Consumer Code for Home Builders adjudication.
5. Small claims court or formal civil court.

Frequently Asked Questions

How long do I have to snag a new build in the UK?

The defects liability period on most JCT contracts is 12 months from practical completion. NHBC Buildmark warranty covers structural defects for 10 years and finish defects for 2 years.

Can I refuse to complete on a new build because of snags?

Yes, if any Category A items remain. These are items that prevent legal or safe occupation. The buyer's solicitor will support this position if asked.

Should I hire a professional snagger?

For a new build over £250,000, yes. A professional snagger typically charges £300 to £600 and finds 30 to 60 percent more defects than the buyer would catch alone.

What is the difference between a snag and a defect?

Trade calls them snags. Solicitors call them defects. They are the same thing. Use whichever your developer and your warranty provider prefer.