The Most Common New Build Snags (and What They Mean for You)
At Ardent, we inspect new homes right across the Midlands, and this guide walks you through the snags we find most often, what causes them, what they actually mean for you in day to day life, and how to get them put right.
What a Snag Actually Is, and the Scale of the Problem
A snag is a defect, blemish or piece of unfinished work left behind once the builder has finished. It might be a paint run on a skirting board, a door that catches on its frame, a missing bead of sealant around a bath, or a weep vent blocked with mortar. The great majority of snags are cosmetic or about workmanship and finish; only a small minority have implications for how the building performs.
It is worth holding two facts together, because they are both true. New build buyers report a lot of snags, yet the Home Builders Federation's most recent survey, published in March 2026 and covering the year to September 2025, found that 90% of buyers are satisfied with the quality of their home, with 93% saying they would recommend their builder to a friend. Most snags are minor, and most are fixable, provided you find them and report them in good time.
The Most Common Snags We Find
Below is a short list of the snag types that appear again and again in our reports, before we look at each area in more detail.
Paint and plaster defects: drips, runs, patchy coverage, cracks and uneven surfaces
Poorly fitted or damaged doors and windows: sticking, misalignment, failed seals, scratches
Tiling, grouting and sealant: uneven grout lines, gaps, and missing or messy silicone
Kitchen and joinery snags: misaligned units, sticking drawers, damaged worktops
Plumbing and drainage: leaks, poor pressure, slow drainage, unconnected wastes
External issues: blocked or missing weep vents, poor mortar and pointing, and rainwater goods
Decoration and Plasterwork
Painting and decorating is consistently the single largest category of snags. In one analysis of 7,758 defects recorded across new build snagging inspections, internal decoration was the worst category, accounting for 32% of all defects found, an average of around 45 separate decorating snags per home. The list is familiar to anyone who has moved into a new build: paint splashes and drips, brush marks, thin or patchy coverage, paint over sockets and hinges, and untidy edges where one colour meets another.
Plasterwork sits close behind, and plastering defects are commonly cited as the single most frequently reported category. Typical findings include uneven or wavy walls, visible board joints on dry-lined surfaces, hollow patches where the plaster has not bonded, and cracking. It helps to know that the NHBC Standards set tolerances for this work. Plastered and dry-lined walls should be flat within a deviation of about 3mm measured with a 2 metre straight edge, and walls should be no more than 8mm out of plumb for heights up to 3 metres. Small shrinkage cracks up to 2mm wide are generally treated as normal as the house dries out, rising to around 4mm where a staircase string meets a wall. This is where an experienced inspector earns their keep, because the question is rarely "is there a mark" but "does this fall inside or outside the accepted standard".
Doors and Windows
Doors and windows are among the most common areas for snags. In LABC Warranty's 2022 peer review of dispute-resolution claims, windows and doors were the single biggest of the six most common defect areas, at 27%. The reason is simple: a doorway or window involves several trades in sequence, from the carpenter who fits the frame to the bricklayer who builds around it, the plasterer who finishes the reveal and the fitter who hangs the ironmongery. A small error at one stage compounds through the rest.
The snags we see most often are internal doors that stick, bind or will not latch, external doors that are out of plumb or whose seals do not compress, windows that are stiff to open or do not lock smoothly, scratched glazing, and failed or misted double-glazed units. Again, there are published tolerances: under the NHBC Standards a door frame should be within 5mm of plumb, the gap between the door and its frame should be a uniform maximum of 4mm, and there are limits on how much a door leaf may be twisted. A sticking door might be a simple adjustment, or it might be a frame fitted out of true; telling the two apart is part of a proper inspection.
Tiling, Grouting and Sealant
Bathrooms, en-suites and kitchen splashbacks are a rich source of snags because tiling and sealing are among the last jobs done, often under time pressure. We regularly find uneven or crooked grout lines, inconsistent grout colour, crumbling or missing grout, tiles left with grout haze across the face, and lippage where adjacent tiles do not sit flush. Silicone sealant around baths, showers, basins and worktops is frequently the weak point: gaps, uneven beads, mould-prone smears, and stretches where the sealant has already pulled away.
These may look purely cosmetic, but poor sealant matters more than it appears. A missing or failed bead around a bath or shower lets water track behind the tiles and into the substrate, where over months it can cause staining, swelling and damp. Catching it on a snag list means the builder reseals it properly rather than you paying to fix water damage later.
Kitchens and Joinery, Including Sticking Units and Drawers
Kitchens are one of the most snag-prone rooms in the house, which is frustrating given they are often the most expensive fitted item. Common findings include cupboard doors and drawers that are misaligned or do not sit flush, soft-close mechanisms that do not work, drawers and units that stick or catch, handles fitted at inconsistent heights, chipped or scratched worktops, and uneven joints where two worktops meet. Elsewhere in the home we find sticking or squeaking internal doors, gaps in skirting and architrave, poorly mitred joints, loose or creaking stair balustrades and nail pops in plasterboard.
The NHBC Standards acknowledge that fitted furniture such as kitchen units should be visually aligned vertically and horizontally, with uniform gaps between adjacent doors and drawers, and factory-finished surfaces should be free of conspicuous scratches when viewed in normal daylight. A sticking drawer or a door that will not sit square is not something you should have to accept on a brand new kitchen.
Plumbing and Drainage
Plumbing snags range from the merely annoying to the genuinely important. We routinely find dripping taps, poor water pressure, slow-draining basins and showers, waste pipes that leak under sinks, toilets that rock or do not flush cleanly, radiators that do not heat evenly, and extractor fans that have been fitted but not connected. Outside, we check that gullies and drains run freely and that surface water is taken away as it should be.
It is worth being precise here. Snagging is a visual and functional assessment; we run taps, flush toilets and check for leaks and flow, but we do not carry out invasive investigation of concealed pipework or below-ground drainage as part of a standard inspection. Where a problem is hidden, persistent or contested, that is exactly the sort of case our intrusive surveys are designed for.
External Issues: Weep Vents, Brickwork, Mortar and Rainwater Goods
The outside of your home is easy to overlook once you are through the front door, but it is where some of the most consequential snags hide. Chief among them are weep vents, and they deserve a proper explanation because they are widely misunderstood.
Most new homes are built with cavity walls, meaning there is an inner and an outer skin of masonry with a gap, or cavity, between them. Rain can and does get through the outer brick skin. To manage this, builders install a cavity tray, a waterproof layer that sits above openings such as windows and doors and at the base of the wall, which catches any water inside the cavity and directs it back outside. The small gaps left in the vertical mortar joints that let that water escape, often fitted with a little plastic grille, are the weep vents, sometimes called weep holes. You will usually spot them as small slots every few bricks above windows, doors and near the bottom of the wall. Under the NHBC Standards, weep holes should be provided at a maximum of 450mm spacing, which is roughly every second brick, with at least two above each opening.
The problem is that weep vents are easily blocked by mortar droppings, known in the trade as mortar snots, that fall down the cavity as the wall is built and set hard over the drainage path. Sometimes they are left out altogether. Either way, the consequence is the same: water that gets into the cavity has no way out, so it pools on the cavity tray and can eventually bridge across to the inner wall, showing up months later as damp patches inside. A blocked or missing weep vent is a small thing to fix on handover and an expensive, disruptive thing to chase down once you are living with damp. This is a workmanship and finish issue we look for carefully, and it is one many buyers would never think to check.
Elsewhere outside, we look at brickwork and mortar: inconsistent or messy pointing, mortar smears across the face of the brick, uneven joints, and cracked or damaged bricks. We check rainwater goods, meaning gutters and downpipes, for secure fixing, correct falls and freedom from blockages and leaks, because water spilling down a wall in the wrong place causes staining and damp over time. We also look at render, decorative stonework, sills and external paintwork, all of which are frequently rushed at the end of a build.
Why These Defects Happen
None of this means new homes are badly built by bad people. The pattern of snags is largely explained by how modern housebuilding works. New homes are assembled outdoors, in all weathers, by many different trades working in sequence and often under real time pressure. When one trade runs late or does rushed work, the next has to work around it, and the finishing trades at the end, decorators especially, are frequently left to cover up the shortcomings of the trades before them with too little time to do it well.
Build programme pressure is real and measurable. Analysis of snagging data has found sharp seasonal spikes in defects around builders' half-year and year-end targets, when regional teams are pushing to hit completion numbers. A skilled-trade shortage across the construction industry adds to the strain, and the sheer number of separate components in a house means small errors are almost inevitable somewhere.
A second, very different cause is entirely natural. A new home is full of water when it is finished, held in the plaster, mortar and concrete. As it dries out over the first months and through its first heating season, these materials shrink slightly, and that produces the fine shrinkage cracks so many new homeowners notice, typically running along the tops of walls or where different materials meet. Minor shrinkage cracking is expected rather than a fault, which is one reason it helps to have someone who can tell the difference between ordinary drying-out and a genuine defect.
What These Snags Actually Mean for You
It is easy to dismiss snags as trivial, but they matter in practical ways. The most obvious is finish and enjoyment: you have paid a significant sum for a new home and you are entitled to the standard of finish the builder promised, not brush marks, wonky units and untidy grout.
Beyond appearance, several snags affect comfort and running costs. Draughty or poorly fitted doors and windows, gaps in insulation and air leakage at junctions let heat escape, which shows up on your energy bills and in cold spots and condensation. This is precisely why our snagging checklist inspections include basic thermal imaging as standard, at no extra cost, so we can point to heat loss and insulation gaps that are invisible to the naked eye.
Then there are the snags that turn into repair bills if ignored. Failed sealant and blocked or missing weep vents both allow water where it should not be, and water damage is slow, hidden and costly to put right. Getting these onto a snag list while the builder is still responsible protects you from paying for them yourself later. Finally, there is resale: a documented, professionally snagged and remedied home is easier to sell and gives a future buyer confidence, whereas unresolved defects have a habit of resurfacing during someone else's survey.
What Snagging Is Not: The Structural Distinction
This is the point where we differ from some competitors, and where it matters most to be accurate. A snagging inspection assesses the quality of workmanship and finish. It is not a structural survey, a full building survey or a mortgage valuation, and it does not assess the structural integrity of your home. We are honest about that boundary because getting it wrong does buyers a disservice.
Some companies imply that a snagging inspection can find structural problems or "render a home worthless" defects. That overstates what snagging is and blurs an important line. Structural matters, foundations, load-bearing walls, roof structure and the like, sit with your warranty provider and with Building Control, who sign the property off against the Building Regulations at defined stages during construction. Your ten-year structural warranty, whether from NHBC, LABC or Premier Guarantee, exists precisely to cover major structural defects, and Building Control confirms the home meets minimum regulatory requirements.
What we do is give you an expert, independent assessment of the finish and workmanship your developer is responsible for putting right, backed by detailed photographic evidence. If, during that inspection, we see signs that point to something deeper, for example crack patterns or movement that warrant further investigation, we tell you plainly and explain the right next step. Where a problem is complex, persistent or disputed, our intrusive surveys are the route for deeper, more forensic investigation. You can read more about the boundaries of the service in our what is snagging guide.
When to Act, and the Two-Year Window
Timing matters enormously, because your strongest protection is time-limited. With most new home warranties, the first two years after legal completion are the builder's defects liability period, during which the developer is responsible for putting right defects arising from a failure to build to the required standard. The NHBC's Buildmark policy, for example, provides a two-year builder warranty period followed by a further eight years of insurance cover against damage caused by specific defects, ten years in total. LABC Warranty and Premier Guarantee follow broadly the same two-year builder plus ten-year structure. Consumer protection has been strengthened, too: most major developers are now signed up to the New Homes Quality Board and its New Homes Quality Code, which gives buyers access to the independent New Homes Ombudsman Service and confirms that the developer is responsible for putting right snags and defects that arise in the first two years.
The practical message is to act early. The ideal moment is before you move in, so the builder can put things right before your furniture and your life are in the way. If that window has passed, an inspection remains genuinely valuable at any point in that first two years, while finish defects are still the builder's responsibility. Leave it too late and the burden shifts, and cosmetic and finish snags become progressively harder to claim once the builder's period ends and only the narrower structural cover remains.
If your builder gives you access before legal completion, a Pre-Completion Inspection carried out against the NHQB checklist is the earliest opportunity to get issues on record. Do note that under NHQB guidelines thermal imaging cannot be included in a Pre-Completion Inspection, which is one reason many of our clients choose our fuller snagging checklist inspection once they have the keys.
How Ardent Can Help
We are fully qualified and insured independent inspectors, and we work exclusively for homebuyers, never for developers. That independence matters: we have no contracts with housebuilders and no conflict of interest, so our only job is to find everything that needs attention and give you the evidence to hold your developer to account.
We offer three services. Our Pre-Completion Inspections follow the NHQB checklist and suit properties you can access before legal completion. Our Snagging Checklist inspection is our most popular service, a thorough assessment of the quality, finish and workmanship of your home inside and out, with basic thermal imaging included as standard at no extra cost. You can see exactly what it covers on our new build snagging checklist page. And for complex, persistent or disputed problems, our intrusive surveys provide bespoke, deeper investigation.
Whichever service you choose, you receive a detailed photographic report within two working days, and we are happy to send a copy directly to your builder to speed things along. Our support does not stop there; we provide ongoing advice through the remedial process, helping you handle discussions with your developer and making sure repair work is done properly. Having inspected thousands of new homes across the Midlands, from Rugby, Coventry and Warwickshire out across Birmingham, Leicester, Nottingham and Derby and on to Oxford, Milton Keynes, Cambridge and Peterborough, we know exactly what to look for and what good looks like.
If you are buying or have recently bought a new build, the single best thing you can do is get it inspected while the builder is still on the hook. Book a snagging inspection today, learn more about us, or get in touch if you would like to talk it through first. Your new home should be finished to the standard you paid for, and we are here to make sure it is.
