Builder in your town

What a builder actually does

A builder is the tradesperson who turns a set of plans into a finished structure. Typical jobs include adding a single-storey extension, converting an attic into a habitable loft, erecting a new detached house, or carrying out a major refurbishment such as re-cladding a façade. In many projects the builder will also manage the supply of bricks, timber, roofing felt and other core materials, organise site set-up, and coordinate the trades that specialise in the finer bits – for example, a certified electrician will handle wiring, a qualified plumber will install pipework, and a roof-tiler will finish the roof covering. The builder’s responsibility usually stops where specialist work begins; a structural engineer may be called in for complex calculations, an architect may design the overall shape, and a plasterer or decorator will finish the interior surfaces after the builder’s rough-in stage is complete.

When a builder is asked to carry out an extension or loft conversion, the work almost always touches on the Building Regulations. The local council’s Building Control service, or a private registered building control approver, must be consulted to confirm that the new work meets fire safety, structural stability and energy-efficiency standards. In many cases the work also falls under the Party Wall etc. Act 1996, which comes into play when a wall, floor or foundation that is shared with a neighbour is affected. The act requires the builder to serve appropriate notices and, if necessary, to arrange a party-wall award before the work proceeds.

How to choose a reliable builder

The first step is to look for evidence that the builder is recognised by the schemes that matter to home owners. TrustMark is the government-endorsed quality mark for work carried out in and around the home. A builder registered with TrustMark has been checked for proper insurance, competence and compliance with health and safety law. You can verify a registration on the TrustMark website by entering the firm’s name or registration number.

Membership of the Federation of Master Builders (FMB) is voluntary, but it does provide an extra layer of reassurance. FMB members are vetted before they join and are subject to periodic inspections. While membership does not guarantee perfection, it does mean the builder has agreed to adhere to a code of practice that covers workmanship, health and safety and fair trading.

Ask the builder to show a current public liability insurance certificate before any work starts on your property. This cover protects you if the contractor or their employees cause accidental damage to neighbouring properties, passers-by or the building itself. The certificate should list the insurer, the policy number and the level of cover; you can contact the insurer directly to confirm that the policy is still active.

When you speak to a prospective builder, probe for details that reveal how they organise their business. Good questions include: how many similar projects have they completed in the last twelve months, whether they employ qualified site supervisors, how they handle subcontractors, and what their typical timescale is from start to hand-over. A builder who can point to recent work in the vicinity of your town will be familiar with the local council’s planning department and Building Control procedures, which can smooth the approval process.

Finally, ask for references from recent customers and, where possible, arrange to see a completed project in person. A reputable builder will be happy to provide contact details for former clients and will not shy away from showing you the quality of their finished work.

Quotes, estimates and the paperwork you need

A written quote is a fixed price for a clearly defined scope of work. It should break down labour, materials, any specialist subcontractor fees and VAT, and it must state what is excluded – for example, the cost of a new kitchen if that is not part of the agreed work. An estimate, by contrast, is only a best-guess figure and can change once the builder uncovers hidden issues such as damp or structural defects. Insist on a quote before any work begins; a quote protects you from surprise costs and gives you a concrete basis for comparison with other firms.

The quote should also set out the payment schedule. Most reputable builders ask for a modest deposit – often no more than ten per cent of the total – before mobilisation, followed by staged payments linked to measurable milestones such as completion of the foundations, erection of the walls and final hand-over. This approach keeps the cash flow balanced and gives you leverage to ensure the work proceeds to the agreed standard.

In addition to the quote, you should receive a written contract that incorporates the Consumer Rights Act 2015. That legislation obliges the builder to carry out the service with reasonable care and skill, within a reasonable time, and for a reasonable price if no price was agreed. It also covers any goods supplied – for example, windows or doors – which must be of satisfactory quality, fit for purpose and as described. The contract should reference the relevant building-control approvals, any planning permission that has been granted, and the Party Wall notice if applicable.

If you arrange the contract online, over the phone or at the builder’s premises, you are entitled to a 14-day cooling-off period under the Consumer Contracts Regulations 2013, unless you have asked the work to start immediately. During that period you can cancel without penalty, though any costs incurred for materials already purchased may be deducted.

What drives the cost of a building project

Several factors influence the final price of a builder’s work. The size and complexity of the project are the most obvious – a two-storey extension with a complex roof shape will require more labour hours and a greater quantity of structural timber than a simple single-storey bump-out. The choice of materials also matters; high-specification bricks, bespoke windows or premium roofing tiles will raise the material bill.

Site conditions can add hidden costs. If the ground at the site is difficult to excavate, if there are existing services that need to be diverted, or if access for delivery vehicles is restricted, the builder may need to bring in specialist equipment or plan additional site-set-up time. In your area many older properties have solid walls that require careful retro-fitting of insulation, which can increase both labour and material costs.

Regulatory requirements are another driver. Obtaining Building Regulations approval often involves submitting detailed drawings, paying a fee to the council’s Building Control team and, in some cases, arranging a third-party inspection. If the project falls outside permitted development, you will also need to secure planning permission, which can add professional fees for a planning consultant or architect. The Party Wall Act adds an administrative step that, while not usually expensive, does require the builder to prepare and serve formal notices and potentially attend a surveyor’s meeting.

When you compare quotes, look for like-for-like items. A quote that includes a full supply and fit of windows should be compared with another that only supplies the windows, leaving the fitting to a separate contractor. Ensure that VAT is shown separately, that any exclusions are clearly listed, and that the payment schedule aligns with the milestones you expect.

From first enquiry to finished build

The typical journey begins with an enquiry. At this stage you should have a rough idea of what you want – the size of an extension, the desired finish, and any constraints such as a protected view or a listed building status. Have a floor plan or sketch ready, as well as any planning documents you have already obtained. The builder will usually arrange a site visit to take measurements, assess ground conditions and discuss your aspirations in detail.

During the visit the builder will note any potential obstacles – for example, the proximity of a neighbour’s boundary, the presence of underground services, or the need for temporary scaffolding. They will then prepare a written quote, which you should receive within a few days. Take the time to read it carefully, checking that every element you discussed is captured and that any exclusions are spelled out.

If the quote meets your expectations, you will sign the contract and pay the agreed deposit. The builder will then submit the necessary plans to the local council’s Building Control department or to a private registered building control approver. In England and Wales this step is mandatory for most structural work; in Scotland and Northern Ireland the process is similar but the approving body may differ.

Where the Party Wall Act applies, the builder (or you, as the building owner) must serve a Party Wall Notice on the adjoining owners. The neighbours have a set period – usually 14 days – to respond. If they raise objections, a Party Wall Surveyor will be appointed to prepare an award that sets out how the work will be carried out and what compensation, if any, is due.

Once approvals are in place, the builder will mobilise the site: delivering materials, erecting temporary fencing, setting up welfare facilities for the crew and installing any required hoarding. The construction phase proceeds through a series of stages – foundations, walls, roof, internal partitions, services and finishes. At each stage the builder should keep you informed of progress and any emerging issues.

When the work is complete, the builder will arrange a final inspection with Building Control. If the inspector is satisfied, a Completion Certificate is issued, confirming that the work complies with the Building Regulations. The builder should also hand over any warranties for materials, a copy of the insurance certificate and a written guarantee for their own workmanship, typically covering a period of one year.

Common mistakes and warning signs

One of the most common pitfalls is proceeding without a written quote. Verbal agreements are difficult to enforce and can lead to unexpected charges once the work is underway. Another red flag is the absence of a public liability insurance certificate; without it you could be left liable for damage caused by the builder’s crew.

Builders who are not registered with TrustMark, or who cannot produce evidence of FMB membership where they claim it, should be approached with caution. While registration is not a legal requirement, it does provide a level of assurance that the firm has been vetted.

Beware of unusually low deposits or requests for cash-only payments. These can be tactics to avoid leaving a paper trail, making it harder for you to claim back money if the work is substandard or abandoned.

Skipping the Party Wall Notice when it is required can lead to costly disputes with neighbours and even legal action. Similarly, ignoring the need for Building Regulations approval can result in the council ordering the work to be altered or removed, and may affect future resale value.

Finally, do not assume that a builder will automatically source the best materials. Some contractors have preferred suppliers that may not offer the most cost-effective or high-quality options. Ask for a breakdown of material costs and, where possible, compare them with independent supplier quotes.

When things go wrong

If you are dissatisfied with the work, the first step is to raise the issue in writing with the builder. Detail the problem, reference the relevant clause in the contract and set a reasonable deadline for remedial action. Keep a copy of the letter and any email correspondence.

Should the builder fail to respond or refuse to rectify the fault, you can contact your local Citizens Advice service (or Advice Direct Scotland in Scotland, Consumerline in Northern Ireland) for guidance on the next steps. Trading Standards, which operates at the county or unitary council level, can investigate breaches of consumer law and may take enforcement action against a rogue firm.

If the dispute remains unresolved, the small claims court offers a relatively low-cost route to recover money or obtain an order for the builder to complete the work. The claim limit varies across the UK but generally covers the typical cost of a domestic building project. Before proceeding, ensure you have all relevant documentation – the quote, contract, invoices, photographs of the work and any written complaints – as the court will expect a clear paper trail.

Why a local builder can be the smarter choice

Hiring a builder who works in and around your town brings practical advantages. They will be familiar with the local council’s planning and Building Control officers, which can speed up the approval process and reduce the risk of unexpected requests for additional information. A local contractor can also attend the site more frequently, making it easier to resolve issues as they arise and to keep the project on schedule.

Moreover, a builder based in your area will have established relationships with local suppliers, which can translate into quicker delivery of bricks, timber or specialist components. They are also more likely to have a reputation to protect within the community, meaning they have an incentive to maintain high standards and avoid disputes that could damage their standing.

Frequently asked questions

What should I look for in a builder’s insurance? Ask to see a current public liability insurance certificate that lists the insurer, policy number and level of cover. The certificate should be dated within the last twelve months and you can verify its validity by contacting the insurer directly. This cover protects you if the builder’s work causes accidental damage to neighbouring properties, passers-by or your own home.

Do I need planning permission for a home extension in your town? Many extensions fall within permitted development rights, meaning you can proceed without a full planning application, but this depends on the size, height and location of the work. If the extension exceeds the limits of permitted development – for example, if it adds more than a certain amount of floor area or encroaches on a protected view – you will need to submit a planning application to the local council. Checking with the council’s planning department early can prevent costly delays.

When is a Party Wall Notice required? Under the Party Wall etc. Act 1996, a notice must be served when the work involves building on or near a shared wall, floor or foundation, or when excavating within three metres of a neighbour’s property. The builder (or you, as the owner) must serve the notice at least two months before the work starts in England and Wales; Scotland and Northern Ireland have similar provisions. The notice gives the neighbour a chance to object and, if necessary, to appoint a surveyor to draw up an award.

How can I verify a builder’s TrustMark registration? Visit the TrustMark website and enter the builder’s name or registration number in the search field. The site will display the firm’s registration status, the scope of work they are approved for and the date of their latest inspection. A registered builder will have a TrustMark logo they can display on their marketing material, but always double-check the online register yourself.

What does the Consumer Rights Act 2015 mean for my building project? The Act requires that any building work be carried out with reasonable care and skill, within a reasonable time and, where no price is agreed, for a reasonable price. It also protects you if the goods supplied – such as windows, doors or kitchen units – are not of satisfactory quality, fit for purpose or as described. If the builder breaches these rights, you can demand a price reduction, a repeat of the work or a full refund, depending on the severity of the failure.

What steps should I take if the builder refuses to fix a fault? Start by sending a formal written complaint that details the problem, cites the relevant contract clause and sets a deadline for remedial action. If the builder does not respond, contact Citizens Advice for advice on escalation, then raise the issue with Trading Standards, which can investigate unlawful practices. As a last resort, you may pursue a claim in the small claims court, providing all documentation – quote, contract, invoices, photographs and correspondence – to support your case.