Newbuild inspectors warn buyers to 'flush the toilet' as common construction snags pose safety and value risks

Homebuyers should test the toilet flush and carry out detailed inspections before completing purchases of newbuild homes, industry experts warned, after a range of safety and quality defects were reported on recently completed developments.

Tom Britton, managing director of HomeSnag, a U.K. newbuild inspection company, told the Daily Mail that a simple flush check frequently reveals concealed problems, from blocked soil pipes to severe water ingress and sewage backflow. He said his teams routinely find defects that were missed during developer sign-off and official inspections.

Britton said thermal heat-loss surveys carried out in winter often uncover large gaps in cavity wall insulation, or insulation that is entirely absent, undermining a key selling point of new homes — their energy efficiency. He also described instances in which waste pipes had not been connected to drains, leading to serious contamination: "A couple weeks after moving in the whole of the house was being flooded with faeces every time they flushed the toilet," he said.

In one anecdote Britton recounted, an inspector from the National House-Building Council had signed off on a house while his team performed final checks; a flush of an upstairs toilet then caused water to pour through the ceiling. "It doesn’t take a lot to find these things but they just get completely missed," he said, adding that some defects reflect builders cutting corners.

Surveyors and tradespeople who work on newbuild estates described a range of recurring problems, including unconnected soil vent pipes that leave bathrooms smelling of foul sewerage, widespread mould growth inside kitchens and living rooms, loose balcony railings on high-rise blocks, and uneven staircases that have contributed to falls. Britton said crews have discovered bottles of urine hidden under kitchen units, behind baths and in lofts during inspections.

Dan Hinton, a builder who posts videos of new developments on TikTok, told the Daily Mail that garden landscaping on many new estates is poor and that layouts often leave buyers with little privacy. "Ninety per cent of them are absolutely diabolical," he said, describing boggy plots, drainage failures and uniform designs that place fences and synthetic turf back-to-back. Hinton also criticised the internal finishes used on some developments, saying stairs made from medium-density fiberboard (MDF) rather than timber swell and fail when exposed to moisture and that carpet backing is sometimes glued rather than properly fixed.

Developers and some trade bodies say defects are addressed under warranty and through quality-assurance schemes, but inspectors and tradespeople say problems are frequent enough that buyers should commission independent snag surveys before completion. HomeSnag and similar firms conduct pre-completion checks that include thermal imaging, drainage tests and structural reviews.

The concerns come as demand for new housing remains strong and buyers often pay premiums for homes marketed as energy efficient or low maintenance. Critics say that when construction standards fall short, buyers can face higher repair bills, health risks from damp and mould, and reduced long-term value.

Industry bodies encourage buyers to check the terms of any warranties or insurance-backed guarantees, such as those provided by the National House-Building Council, and to document defects promptly. Surveyors recommend that viewing appointments include operating taps and toilets, checking vents and drains, and inspecting loft spaces and external drainage. If problems are discovered, buyers can seek remedial works from developers, with unresolved disputes sometimes referred to warranty bodies or, in some cases, to legal advisers.

Developers contacted for comment in several other reports say they expect high standards on their sites and that most issues are remedied through established aftercare processes. Homebuyers and consumer groups say higher levels of independent oversight and more rigorous quality controls at completion would reduce the frequency of defects.

As newbuild volumes remain a significant part of the housing market, estate managers, builders and consumer advocates say clearer expectations for construction quality and more consistent pre-completion inspections could limit costly and hazardous defects for new homeowners. In the meantime, inspectors urge buyers to perform straightforward tests — including the flush test — and to commission independent surveys before taking possession.