Written by Mark Reid,
Trades Editor ·Verified 6 October 2026
St Helens has a real mix of housing stock, from the Victorian terraces around Thatto Heath and Parr to the postwar semis in Sutton and the newer developments out towards Bold and Blackbrook. That variety means builders here need to be comfortable with everything from period brick repointing to modern cavity wall extensions. Ground conditions can vary too, with old mining activity in parts of the borough meaning some jobs need a bit more care with foundations than you'd expect elsewhere. Loft conversions and rear extensions are common requests, especially in the terraced streets where side access is tight and space is at a premium.
The businesses featured on this page come from public business listings, ranked by their review rating and how many reviews they've collected, with a small lift given to those showing a working website and phone number. We read each business's homepage to check that builders work is genuinely what they do, which stops unrelated trades slipping onto the page. Listings that show as permanently closed get removed automatically. Where you spot a Trust Verified badge, that business has gone through our full verification covering trade qualifications and accreditations, public liability insurance, trading history, customer review history and registered company information (our How We Verify page has the full detail). For businesses without that badge, none of that has been independently checked by us, so it's worth doing that homework yourself before you book anyone.
Before committing to a builder, ask to see proof of their public liability insurance and, if the job involves gas or electrics, relevant Gas Safe or NICEIC registration. For anything structural, check whether building control sign-off is needed and who's responsible for arranging it. Get a written quote that breaks down materials and labour separately, not just a total figure, and get at least two or three quotes so you can spot anything that looks unusually cheap or expensive. Ask for photos of recent, similar jobs and, where possible, speak to a previous customer directly rather than relying on reviews alone.
How We Select & Rate The Best Builders in St Helens
Ranking is driven by review rating and review count from public business listings, with a small lift for businesses showing a working website and phone number. We check each business's homepage to confirm builders work is what they primarily offer, which keeps unrelated trades off the page. Listings flagged as permanently closed are removed automatically. Businesses marked Trust Verified have additionally passed our full verification covering trade qualifications and accreditations, public liability insurance, trading history, customer review history and registered company information; see our How We Verify page for the full list. Other businesses on this page haven't been independently verified by us, and their inclusion isn't an endorsement. Always do your own checks before hiring.
Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. Every other listing is ranked on rating and review count from third-party business listings. How we rank & verify →
A 5.0 Google rating across 30 reviews sets Metro Developments Ltd apart among builders in St Helens. The company takes on building work for domestic and commercial clients in the town and the surrounding Merseyside area. Its website, metrodevelopments.uk, gives details of the projects it undertakes and how to arrange an initial enquiry.
Families across St Helens rely on HMS for building and maintenance work, from repairs to larger renovation projects. Based in the WA9 area, the firm has built a reputation among local households, reflected in a 4.8 rating from those it has worked with. Jobs are carried out with attention to the practical needs of everyday family homes.
St Helens is home to C-Probe Systems Ltd, a builder working on structural repair and corrosion protection projects rather than general house building. The firm focuses on concrete and reinforcement issues, applying specialist monitoring and remediation methods to extend the life of existing structures.
Extensions and new builds form the core of Kieran Construction's work in St Helens, with the firm taking on residential projects from groundwork through to completion. Operating across the WA9 area, the company handles the full build process under one contractor rather than coordinating multiple trades. Their website sets out the range of work they cover.
Transparency notice: Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. All other listings are ranked by a combined score drawn from ratings and review counts published on third-party business listings, plus basic completeness signals such as a working website and phone. A Trust Verified badge means we have independently checked that business's documents; businesses without it have not been independently verified by us. How we verify →
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A small extension or loft conversion typically runs from around £15,000 to £35,000 depending on size and finish, while a full kitchen extension can push past £40,000 once plumbing and electrics are included. Smaller jobs like repointing a chimney or rebuilding a garden wall might cost £500 to £2,000. Prices depend on materials, whether structural work or building control involvement is needed, and how easy access is to the property. Getting two or three written quotes is normal practice and helps you spot a fair price.
Do I need planning permission for an extension in St Helens?
Many single-storey rear extensions fall under permitted development rights, but this depends on the size, how close you are to boundaries, and whether the property is in a conservation area. St Helens Council's planning department can confirm whether your project needs an application. A good builder will usually flag this early and can point you towards a local architect or planning consultant if drawings are needed.
How long does a loft conversion or extension take?
A straightforward loft conversion usually takes four to six weeks once building control approval is in place. A single-storey extension often takes eight to twelve weeks depending on weather, groundwork and whether you're changing drainage or moving a stopcock. Delays are common if materials are on back order or if structural issues turn up once walls are opened up, so build a bit of flexibility into your timeline.
What should be included in a builder's quote?
A proper quote should separate labour and materials, list the specific work being done, state a start and estimated finish date, and include who's responsible for waste removal and any skip hire. It should also clarify payment stages, for example a deposit, a mid-project payment and a final balance on completion. Avoid paying large sums upfront before any work has started.
Do builders in St Helens handle building control and inspections?
Most established builders will liaise with building control on your behalf for structural work, extensions and loft conversions, but it's worth confirming this in writing before work starts. You'll usually need a completion certificate at the end of the job, which matters if you come to sell the property later. Ask who's submitting the application and who's paying the building control fee, as this sometimes catches people out.
How do I choose between builders in St Helens?
Start by reading recent reviews rather than just the star rating, since detail in a review often tells you more than the number itself. Ask each builder for two or three references from jobs similar to yours and, if you can, go and look at finished work in person. Check their public liability insurance certificate and, for gas or electrical work, confirm current Gas Safe or NICEIC registration. Get quotes from at least three builders, compare what's actually included rather than just the bottom line figure, and trust your instincts if a quote seems rushed or vague.
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