Construction Snagging Lists: A Practical Guide

What a snag is and what snagging means

A snag is a small fault in finished or nearly finished building work that falls short of the agreed standard: a chipped worktop, a door that binds, a paint run, a missing trim. Snagging is the structured process of inspecting the work, recording every fault, and tracking each one until it is fixed.

On a UK site the word covers anything from a hairline crack in plaster to a radiator that was never bled. Most snags are cosmetic or minor functional issues, not safety risks, but left unrecorded they pile up, get forgotten, and become the thing a buyer or new tenant notices on day one. A good snagging list turns a vague feeling that "the place needs finishing" into a precise, assignable, trackable task list.

The aim is simple: hand over a property where nothing has been missed, and where you can prove what was checked, by whom, and when.

The difference between a snag and a defect

A snag is a minor finishing fault that is quick and cheap to put right, such as a sticking door or a paint blemish. A defect is a more serious failure, usually structural, weatherproofing, or compliance related, that can cause damage or render the home unsafe or unfit. The two are recorded the same way but escalated very differently.

The distinction matters because of how UK warranties treat them. With an NHBC Buildmark policy, the most common new home warranty in the UK, the builder is responsible for putting right problems caused by a failure to meet NHBC Technical Standards during the first two years from the policy start date, according to NHBC. From the start of year three to year ten, NHBC's insurance covers defects in specified structural and weatherproofing parts of the home, but only where actual damage has occurred.

In practice:

• A snag (squeaky hinge, grout gap, scuffed skirting) is yours to fix before handover and rarely involves anyone outside your own trades.
• A defect (leaking flat roof, cracked lintel, damp ingress, a stair that breaches building standards) needs a proper diagnosis, often a specialist, and may trigger a warranty or building control conversation.

Record everything in one place, but flag genuine defects as high priority and deal with the root cause, not just the symptom.

When to snag: during the build and at pre handover

Snag in two waves. The first runs continuously through the build, catching faults at each stage while the trade responsible is still on site and the work is easy to access. The second is a formal pre handover inspection of the finished property, done before the client moves in or the first tenant arrives, when the whole job is judged against the agreed standard.

Catching snags as you go is far cheaper than catching them at the end. A plumbing fault is trivial before the wall is boarded and tiled, and expensive after. So build snagging into your routine:

• First fix: check pipework, cabling, and framing before anything is closed up.
• Second fix: check fittings, doors, sockets, and switches as they go in.
• Decoration: check paint, sealant, and finishes room by room.
• Pre handover: one final, methodical sweep of the entire property.

For new build homes there is a strong reason to be thorough before completion. Once you are in years three to ten of an NHBC policy, smaller non structural snags and fixtures become the homeowner's responsibility rather than the builder's, so the pre handover window is when most finishing faults must be caught and fixed. If you want a deeper walkthrough of that final inspection, see our guide to the pre handover snagging inspection.

How to run a structured room by room snag list

Work through the property in a fixed order, one room at a time, and check the same categories in every room. A consistent route stops you skipping spaces, and a consistent checklist stops you missing the same thing twice. Start at the front door, move clockwise around each room, then finish with the exterior and any shared or plant areas.

In each room, look at the same things in the same order:

1. Ceilings and walls: cracks, uneven plaster, paint runs, poor coverage, nail pops.
2. Floors: lifting boards, gaps, scratches, uneven tiles, lippage.
3. Doors and windows: alignment, smooth operation, seals, locks, handles, scratches to glass or frames.
4. Skirting, architrave, and trims: gaps, poor mitres, missing sealant.
5. Electrics: every socket, switch, and light tested; faceplates straight and clean.
6. Plumbing and heating: taps, flushes, drainage, radiators, visible pipework, leaks.
7. Kitchen and bathroom units: doors aligned, soft close working, sealant neat, worktops undamaged.

Then walk the outside: brickwork and pointing, render, guttering and downpipes, roof line, external doors, drainage, and any paths or boundaries you are responsible for. Keep a torch, a spirit level, and your phone camera to hand. Many small builders combine this with their construction site diary so the inspection record sits alongside the daily log of who did what.

Recording each snag well

Record every snag with enough detail that someone who was not there can find it and fix it without asking you a single question. At minimum, capture the location, a clear description, a priority, the person it is assigned to, and a photo. Vague entries like "fix kitchen" cause repeat visits, arguments, and missed items.

Each snag needs five things:

• Location: be specific. Not "bathroom" but "main bathroom, wall behind WC".
• Description: state the fault and the expected standard. "Silicone seal to bath edge has a 5mm gap; reseal to a continuous neat bead" beats "bad sealant".
• Priority: high, medium, or low (see below).
• Assignee: the named trade or person responsible, not just "builder".
• Photo: one clear image, ideally with something for scale or a wider shot showing where it is.

A timestamped photo is the single most useful field. It removes ambiguity, settles "I already fixed that" disputes, and gives you a before and after record. Doing this on paper or a stray WhatsApp thread is where it falls apart: photos get separated from the note, nothing is searchable, and nobody knows the current status. This is exactly the kind of admin a unified tool like Build & Let is built to absorb, keeping each snag's location, priority, assignee, and photo together against the right project so nothing slips.

Prioritising snags

Triage every snag into high, medium, or low so the right things get fixed first and nothing critical hides behind a list of paint touch ups. Priority is about consequence and urgency, not effort. A two minute job that affects safety or stops handover outranks a half day cosmetic fix that nobody will notice.

A simple, defensible scale:

• High: anything affecting safety, security, weatherproofing, or compliance, or that blocks handover. Examples: a faulty consumer unit, a window that will not lock, water ingress, a stair that breaches building standards. Genuine defects almost always sit here.
• Medium: functional faults that work for now but are clearly below standard. Examples: a door that binds, a slow draining sink, a radiator that will not balance.
• Low: cosmetic items with no functional impact. Examples: minor paint marks, small scuffs, a slightly proud screw head.

Fix every high priority item before handover without exception. Mediums should be closed out before handover too, with a documented plan for any that genuinely cannot be. Lows can be batched and tackled efficiently by trade, but they still get recorded and closed, never quietly dropped.

Tracking snags to completion

Track each snag through clear states from raised to closed, and never delete an entry. A snag list is only useful if it shows current status at a glance: what is outstanding, what is in progress, what is fixed but unchecked, and what is signed off. The status field is what turns a list into a workflow.

Use a small, fixed set of statuses:

• Open: raised, not yet started.
• In progress: assigned and being worked on.
• Fixed, awaiting check: trade says done, not yet verified.
• Closed: reinspected and signed off.

The "fixed, awaiting check" step is the one people skip, and it is the one that matters. A snag is not closed because someone says they fixed it; it is closed because you went back, looked, and confirmed it meets the standard. Re inspect in person, update the status, and keep the photo trail. Hold a brief weekly review while the list is live so items do not stall. Keeping a clean, dated audit trail also helps your wider records stay tidy, the same discipline behind good document control for small builds.

A sample snag list table

Here is what a working snag list looks like in practice. Keep the columns consistent for every entry so it sorts, filters, and reads cleanly.

Common snags to look for

The same faults appear on site after site, so a checklist of usual suspects catches most of them fast. The most common UK snags are cosmetic and second fix issues: paint defects, sealant gaps, misaligned doors, and untested electrics. Knowing the pattern lets you inspect with intent rather than wandering.

Watch for these in particular:

• Paint and plaster: runs, thin coverage, roller marks, cracks at corners, nail pops.
• Sealant and grout: gaps or messy beads around baths, basins, sinks, and tiling.
• Doors and windows: binding, poor alignment, gaps, faulty locks, scratched glass.
• Tiling and flooring: lippage, uneven grout lines, hollow or loose tiles, lifting boards.
• Kitchens and bathrooms: misaligned unit doors, soft close not working, chipped worktops.
• Electrics: dead sockets, switches wired the wrong way, crooked faceplates, missing blanks.
• Plumbing and heating: dripping taps, weak flushes, slow drainage, radiators that will not balance.
• External: poor pointing, blocked or leaking gutters, paint on brickwork, untidy render edges.

If the property is going straight into a tenancy, fold the snag close out into your move in process so you hand over a genuinely finished home. Our walkthrough on going from building site to first tenant covers how the two stages join up.

Frequently asked questions

Who is responsible for fixing snags on a new build home?

In the first two years of an NHBC Buildmark policy, the builder is responsible for putting right faults caused by a failure to meet NHBC Technical Standards, according to NHBC. Report them in writing within that period to keep your cover and dispute rights intact.

What is the difference between a snag and a defect?

A snag is a minor finishing fault, like a paint mark or a sticking door, that is quick and cheap to fix. A defect is a more serious failure, often structural, weatherproofing, or compliance related, that can cause damage or make the home unsafe. Defects need proper diagnosis and may trigger a warranty claim.

When should I do a snagging inspection?

Snag continuously through the build, checking each stage before it is closed up, then run one formal pre handover inspection of the finished property before the client moves in or the first tenant arrives. Catching faults early is far cheaper, and the pre handover sweep is your last clean chance to fix finishing issues.

How long does an NHBC warranty last?

An NHBC Buildmark policy provides cover for ten years. The builder warranty period is usually the first two years from the policy start date, followed by insurance cover from year three to year ten for specified structural and weatherproofing defects where damage has occurred, according to NHBC.

How should I record a snag?

Record five things for every snag: a specific location, a clear description that states the fault and the expected standard, a priority of high, medium, or low, the named person it is assigned to, and a clear photo. A timestamped photo is the most valuable field, because it removes ambiguity and settles disputes.

Bringing it together

A good snagging list is not bureaucracy, it is the difference between handing over a property you are proud of and chasing loose ends for weeks. Inspect as you build, run a thorough pre handover sweep, record each snag with a location, description, priority, assignee, and photo, then track every item through to a signed off close. If you would rather keep snags, costs, photos, and your build tasks in one place instead of scattered across spreadsheets and group chats, try Build & Let free for 14 days and run your next snag list without the admin headache.

Sources:

• NHBC, In the first two years of the policy
• NHBC, Buildmark cover