The most common construction defects - and the training that prevents them

Despite the many challenges facing the construction industry, today’s builders are passionate about delivering quality new homes for their customers.

In fact, the latest NHBC National New Homes Survey – which we send out twice to occupants and buyers at eight weeks and nine months after completion – showed that a remarkable 94% of respondents would recommend their builder to a friend.

Even with the majority having never owned a new-build property before, one in five also reported experiencing fewer snags than they expected, reflecting the relatively smooth handover process on most sites.

Nevertheless, every single quality issue that crops up during construction has an impact.

From safety to customer satisfaction and from build times to cost control, damaging defects are every builder’s nemesis.

So what do they look like – and how can you prevent them?

What we mean by ‘defect’

The first thing to note is that while snagging might be what immediately springs to mind, construction defects can vary in scale from minor issues that can be resolved quickly to major and more severe structural problems.

They are typically caused by design errors, material choices, poor workmanship or a lack of supervision – or indeed any combination of these factors.

Of course, it’s impossible to cover every type of defect comprehensively here.

Instead, let’s explore some of the most common issues our Building Inspectors find while out on site day in, day out.

Structural and groundwork defects

Issues with foundations, supports or load-bearing elements may result from poor site preparation, incorrect sequencing or misunderstandings about ground conditions.

While such problems can range in severity, they can often be among the most costly and time consuming to resolve, given they usually take root prior to the majority of other construction work.

Waterproofing and damp issues

The UK’s famously fantastic climate means failures in damp-proof courses, membrane installations or inadequate drainage are particularly troublesome for builder and occupier alike.

Improper detailing, rushed installation or insufficient knowledge of moisture control measures can all contribute.  

Roofing and weatherproofing failures

Making just one mistake with a roof can lead to water ingress or damage when the weather turns.

Poorly fixed tiles, defects in flashing and inadequate ventilation are among the most frequently reported problems, typically caused either by incorrect installation techniques or a lack of technical understanding.

False chimneys and dormer windows are common areas for water ingress, too.

Brickwork, masonry and external walls

Inconsistent mortar, poor bonding and insulation gaps are some of the most commonplace issues in this category.

They’re often the result of time pressures, inadequate supervision or simply low workmanship standards.

Timber frame trouble

Many builders are using more timber frame construction in their portfolios as they try to reap the speed, efficiency and carbon-reducing benefits of engineered wood.

But this method requires specialist skills from trained teams to ensure, for example, that homes don’t develop structural problems or moisture issues in the short, medium or long term.

It’s essential that professionals with specific knowledge of timber frame construction carry out this work – or defects can cause a nasty surprise later on.

Mechanical, electrical and plumbing problems

Things can go awry when it’s time to get services connected, too.

Co-ordination and communication mistakes may be to blame, as can rushed work or a lack of practical training.

Finishing and snagging issues

These are perhaps the most familiar faults in new-build homes; things like cracks, uneven surfaces, poor alignments and damaged finishes. 

While many can generally be put right in a timely fashion, they are still a source of annoyance for homeowners and builders alike, typically resulting from a rush to meet deadlines, a lack of snagging awareness or limited attention to detail.

More than mere hiccups

The nature of constructing something as complex and important as a new home is always going to pose challenges.

But ever year, even the most diligent and skilled builder must wrestle with the impacts of defects – whether few or many.

Every single construction fault can hurt your business through:

• increased build costs incurred from rework
• project delays
• handover risks
• reduced customer satisfaction and increased complaints
• long-term performance issues
• safety concerns
• reputational impact to both developers and contractors
• challenges in achieving compliance, warranty or insurance on your project.

Skills prevent sudden bills

All of the defects mentioned above can be prevented, avoided or mitigated against through one simple measure: training.

From planning to design to construction confidence, co-ordination between contractors and effective quality control, ensuring your teams have the right skills is essential.

Improving employee knowledge closes the skills gaps in your business by equipping them with greater practical, real-world understanding of their profession and everything your projects entail.

What’s more, good training provision fosters a culture of proactivity that encourages workers to identify issues early and feel empowered to raise concerns before they go on to become costly to resolve.

The quality of specific workmanship will improve across your relevant trades, but so too will your team’s confidence when it comes to understanding not only what is compliant, but also what best practice looks like.

And even if you’re content with your workforce’s current performance, maintaining their capabilities with regular training that keeps their skills and knowledge up to date can fend off the threat of expensive on-site mistakes later down the line.

Training that targets defects

We’re as passionate about the quality of new homes as you are. That’s why we’ve developed a broad, constantly expanding range of training courses and sessions designed to help you get it right first time.

Our snagging and defect prevention training shows your teams how to spot the common issues we’ve discussed above, as well as how to improve finishing standards, reduce post-completion issues and inspect their work thoroughly and consistently.

The technical skills courses we offer, meanwhile, cover trades such as brickwork, carpentry, roofing and groundworks, providing hands-on, real-world instruction on correct installation methods, proper sequencing and achieving compliance with the NHBC Standards.

Our supervisor and management training is perfect for leaders who want to maintain quality control on their sites by overseeing their teams effectively and spotting defects themselves.

And our NHBC apprenticeship programmes can also help you develop and grow your future workforce with expert-led training in site-like conditions that gives you new talent ready to make an impact from day one.

In a market where every defect digs into your margins and poses real risks to your business, investing in training is a smart decision that can pay dividends today and tomorrow.