Finding a builder with availability may feel like an impossible task, but before you rush into signing a contract, follow our steps to ensure your tradespeople are up to the job, trustworthy and will deliver what they say they will on time and within budget.

Click or scroll for the essential questions to ask your builder before committing your time and money...

You wouldn’t employ someone to work in an office without asking them about their experience, so while it may seem like overkill to ask for a CV, asking some questions about your builder’s background is essential.

Find out how many years they’ve been trading and what specific experience they have that relates to the work you want to do. For example, if you're planning to convert your attic, look for a builder who specialises in loft conversions.

While checking third-party sites like Check-a-trade, MyBuilder and Google Reviews are all very useful, you can’t beat a more personal testimonial. This can include local forums, friends and family or speak to nearby homeowners who have had similar works carried out and are happy to recommend their builder.

A good builder will be only too happy to show off examples of past works. This will not only be a chance to assess the finished project for style, quality and finish, but it also demonstrates that the builder takes pride in their work, which is extremely important.

You don’t need specific qualifications to call yourself a builder, but a Constructions Skills Certificate Scheme (CSCS) card is a good sign, while trade associations such as the Federation of Master Builders (FMB) lend certain gravitas.

Ufuk Bahar of Urbanist Architecture, says trade associations are “a good way to share new information about practices, policies, and other things specific to that industry.” Oh, and don’t take their word for it – get them to show you or check with the association.

"Even if your builder comes highly recommended and you’ve been impressed by other jobs they’ve done, projects can sometimes go wrong," explains Helen Phipps at Compare the Market. "It's essential the builder you hire has the right insurance for the job."

As a bare minimum, this should include liability insurance but also ideally employer's liability insurance and possibly professional indemnity insurance. Always ask to see certificates as proof of insurance before work begins.

If you are planning an extension or other extensive works then you might find it easier to employ a builder who works with their own architect so you don’t have to source one separately.

"If you need planning permission, it is sensible to engage an architect," says the Royal Institute of British Architects (RIBA). “A good architect will propose solutions and develop your brief so that it reflects your aspirations.” They will also help you prepare the appropriate applications to your local authority.

It’s not unusual for builders to sub-contract on bigger projects, but to keep your project on schedule it is convenient if they already have essential specialists like electricians and gas engineers on their team or at least have people they work with regularly. Sourcing and project managing additional trades yourself may result in extra time, money and stress.

If your build project requires planning permission, it can seem like a minefield to the uninitiated, so it’s worth asking if the builder – or their architect – will submit any relevant permissions on your behalf to take the stress out of it for you.

It needn’t be a deal-breaker if they won’t, the FMB has some good advice on how to submit planning permission yourself if not, and it’s not as complicated as you might think.

If your build project requires lots of different tradespeople, then you may find it easier to enlist the services of a site manager who can communicate with architects, local authorities and the different trades to ensure everything happens when it should. Your builder may be happy to take on this role or they might request you hire a third party, which will incur an extra cost. If this is the case and you are on a tight budget, you may prefer to project manage the build yourself.

A building inspector will want to view your work in progress at several stages and a completion certificate will need to be issued when you finish. “You are ultimately responsible for ensuring that any works on your property comply with building regulations (and planning laws if necessary),” explains Which? “However, if you employ a trader, the responsibility for dealing with building control normally passes to them.” Agree on who will be in charge of booking inspections at the start and try to meet with the inspector alongside your builder for peace of mind that everything complies.

If you decide not to project manage the build yourself or you move out during the work, it’s a good idea to check with your builder what they’ll need from you and when throughout the process. Decisions such as positions of lighting and plug sockets will need to be made as you go along, so you’ll need to be available for these key stages.

Any builder worth their salt should guarantee their work and if they won’t, it's a red flag. According to C K Architectural: “In the UK, a builder is typically liable for their work as long as their contracts dictate, and that tends to be 1-2 years as is the standard limitation period in most contracts.

Outside of typical contracts in a broader sense, the legal limit would typically be six years in line with the Limitation Act, 1980. Which? also suggests getting an insurance-backed warranty.

The terms 'quote' and 'estimate' can easily be mistaken for the same thing, but don't be caught out. While an estimate is a rough estimation of how much a project might cost, a quote should be a fixed total.

While there will likely be unforeseen factors that may require extra work or materials, it's important you can budget for as close to the final cost as possible before work begins. One way to do this is with an itemised quote that lists everything from materials to labour and whether it includes VAT.

Which? recommends getting at least three quotes for your job and always insisting on a site visit.

Nobody likes to talk about money but it's imperative that you agree on payment terms in advance. It's a sensible idea to set out a schedule of staged payments and alarm bells should ring if you’re asked to pay a big deposit – over 25% – or cash up front. Make sure you get a receipt for every payment and pay by credit or debit card if you can as this will give you some security under Section 75 and Chargeback schemes.

The Citizen’s Advice Bureau says you can also protect your deposit or any staged payments with a deposit protection scheme or with an insurance-backed warranty.

While your builder doesn’t have a crystal ball, the chances are they have a lot more experience in jobs like this than you do, so ask up front if they anticipate any potential problems, such as having to move water pipes, electrical cables or dealing with damp issues.

Try to set some money aside in your budget to cover these eventualities. Velux suggests 20% over the estimated cost to allow for a contingency fund.

Knocking down walls, removing old kitchens and bathrooms and digging for new foundations all create a lot of mess and though it may seem obvious, it’s worth making sure that your builder knows that you expect them to get rid of it all as part of the job.

Usually, this will involve organising skips to take debris away and your builder should include this cost in the quote. When the job is finished, make sure they organise for the skip to be collected and that the site is left tidy.

While it's inevitable that building works will create lots of dust and dirt, a good builder will do the right prep work to ensure the impact on your home is minimal. This will include using adequate coverings or perhaps even building a temporary partition wall to separate your living space from the work.

Some homeowners may want to decamp to a family member’s home or rental property while work is underway. In these cases, you must have a clear understanding from your builder of how they will secure your property each day to protect you from theft and weather damage. You'll also need to let your insurance company know if your home will no longer be occupied.

However frustrating it may be, consequential damage to your home is likely to occur, especially when extending. Therefore, it's worth getting in writing how you expect your home and garden to be left at the end and whose responsibility it will be to fix any damage to existing walls and skirting boards, for instance. Access points such as fences and gates may also need to be taken down, so again, make sure you agree on who will be responsible for repairing them.

While many of us are resourceful enough to create a makeshift kitchen with a kettle, microwave and camping stove for a short period, other facilities are a bit more pressing. A few days without a shower is OK, but no toilet or running water is more of a problem and your builder should keep any turning off of vital services to a minimum and give you fair warning about them.

However well-prepared you and your builder/architect may be, once your renovation is underway, you’ll likely run into obstacles that mean changing your design slightly. Common oversights include structural calculations, foundation issues, hidden pipes or faulty electrics. If this is the case, you need to be confident that your builder will communicate any problems quickly and work with you to find cost-effective solutions.

In the UK, construction work is restricted to 8am to 6pm Monday to Friday and Saturdays between 8am and 1pm. However, different factors may affect your builders’ working day, including leaving the site to pick up materials or whether they’re juggling multiple jobs. Ensure your expectations are clear from the start and request they communicate with you if that changes.

Whether you prefer face-to-face communication or regular text message updates, Velux says this should be “high on your list of questions before hiring a contractor". It advises outlining who your point of contact will be, how regularly you want updates and what you consider to be a reasonable time to respond to queries. It's also worth outlining what the process is if you want to make any changes during the project.

Access can be a big issue when it comes to the ease of a renovation, which unsurprisingly is usually reflected in the cost. Your builder will likely want to park his van or trailer as close to the site as possible to off-load tools and materials and other trades visiting may have separate vehicles. If you live in an area with restricted parking, you might need to contact the council for temporary permits or speak to your neighbours so they don't get irritated if your close turns into Spaghetti Junction.

While we’ve all heard of build projects running weeks or months behind schedule, we shouldn’t just assume that's an expected part of renovating.

Ask your builder to set out a schedule of approximate timings for each stage and allow a reasonable leeway within. Be realistic about things like planning permission, which can take between eight and 13 weeks, according to the government website – that's if your application passes first time.

A verbal contract is not good enough when it comes to your home. Jobs that require a lot of work should be underlined with a contract to ensure all you've agreed on is outlined in writing. The FMB has a selection of contract templates, as does RIBA. 

Make sure yours covers things such as what happens in the case of unforeseen circumstances, what you'll do if you’re not happy with the result and whether any penalties are incurred if work runs late.

Even before you’ve decided to go with a certain builder it’s worth checking their availability to ensure it tallies with your plans. Once you’ve decided to use them, get the start date written into the contract. Ufuk Bahar says: “Try to have some flexibility in your schedule, but don’t allow the builders to dictate what happens based purely on what’s convenient for them: you’re the boss!”

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