How to Hire a Contractor or Builder: Checks, Quotes and Payment Rules

If you are getting ready to hire a contractor to renovate your home, remodel a bathroom or build an extension, the riskiest part is not the building work. It is the week before it starts, when you decide who to trust with your house and agree how money changes hands. Most disputes with builders trace back to that week: a vague scope, a price that turned out to be an estimate, a deposit that was too large, or a final payment made before anyone checked the work.

This guide follows the same six steps in the United States and the United Kingdom, then gives the rules that differ. The US relies on state contractor licensing, insurance and permits. The UK has no general licence for builders, so the checks run through quality schemes, Building Control and two trades where registration is the law. Electricians, plumbers and the warning signs get their own short sections.

The six steps to hire a contractor or builder

The order matters more than any single check. Skip a step and it usually comes back later as a dispute.

• Scope: write down what you want done before anyone prices it.
• Checks: confirm licensing or registration, insurance and recent references.
• Quotes: get several written prices against the same scope.
• Contract: put materials, dates, payments and changes in writing.
• Payments: pay in stages that follow finished work, never everything upfront.
• Sign-off: inspect the result, collect the paperwork, then make the last payment.

Start with a written scope

Spend an hour on a one-page description before you contact anyone. For a bathroom remodel, that means what is removed, which fixtures stay, whether any wall moves, whether plumbing or wiring is relocated, who supplies the tiles and fittings, the working hours you can allow and where waste goes. For an extension, add the drawings and any approvals you already hold.

Send the same page to every contractor. Bids written against your scope can be compared line by line; bids written against each contractor’s own idea of the job cannot, and the cheapest one is often cheap because it leaves something out. The same page later becomes the core of the contract.

The checks at a glance, US and UK

Three questions matter: is this person allowed to do the work, who pays if something goes wrong, and has the work been approved where approval is required.

How to hire a contractor in the United States

Contractor licensing is set by each state, and in some states partly by cities or counties. Your state’s contractor licensing board will tell you whether your job needs a licensed contractor and which license class covers it. Look the license up yourself; a photo of a card proves nothing.

Licensed, bonded and insured

You will see this phrase on almost every bid. Licensed means the lookup shows an active license in the right class, under the name on the bid. Bonded usually means a license bond, which in some states gives consumers a limited way to recover money when a contractor breaks licensing law; it is not a promise of good work. Insured should mean general liability cover for damage to your property, plus workers’ compensation if the contractor has employees. Without it, an injury on your property can turn into a claim against you.

Permits

Structural, electrical, plumbing and mechanical work normally needs a permit from the local building department, and the contractor normally pulls it. Be careful if you are asked to pull it yourself as the owner: in many places that makes you responsible for the work meeting code. Unpermitted work tends to surface when you sell the house or make an insurance claim.

Contract, deposit and lien waivers

A good contract names the scope, the materials by brand and model or as allowances, the start and completion dates, the license number, who obtains which permits, the warranty and a payment schedule tied to stages of work. It also sets a change-order process: every change agreed in writing, with its effect on price and time, before the work is done.

Keep the down payment small. Some states cap it by law on home-improvement contracts, California being the best-known example, so check your board’s rules. Pay by a traceable method, not cash. In many states, subcontractors and suppliers who go unpaid can file a lien against your home even if you paid the contractor, so ask for lien waivers from the contractor and the main subcontractors and suppliers as each payment is made. If you signed at home after a sales visit, the federal Cooling-Off Rule generally gives you three business days to cancel, and many states add rules of their own.

Walk-through and punch list

Before the last payment, the final inspection should be passed. Walk the job with the contractor and write a punch list of everything unfinished or wrong. Hold the final payment until the list is done, then collect the final lien waivers, the warranty and the manuals.

How to find a good builder in the UK

Anyone in the UK can call themselves a builder; there is no general licence to trade. That is where the phrase “cowboy builders” comes from, and why the checks run through schemes and certificates rather than one register. The building rules below are for England, and Wales is close; Scotland and Northern Ireland run their own systems.

TrustMark and trade bodies

TrustMark is the government-endorsed quality scheme for work in and around the home. Registered businesses are vetted and sign up to its standards and complaints process. Trade bodies such as the Federation of Master Builders run their own membership checks. Confirm membership on the scheme’s own website; a logo on a van proves nothing.

A quote, not an estimate

A quote is a fixed price for the work described. An estimate is an informed guess, and the final bill can move. Ask which one you are getting, and get several in writing, itemised, with your scope attached so you can see what is excluded.

Building Regulations and extensions

Notifiable work, which includes extensions, structural changes, much electrical work and new boilers, must meet the Building Regulations. Compliance is checked either by Building Control, through the council or a registered approver, or by self-certification when a competent person scheme member does the work. Either way you should end up with a certificate. Keep it, because a buyer’s solicitor will ask for it. Planning permission is a separate question about whether you may build at all, and an extension near a shared wall may also need party wall notices.

Stage payments and your rights

Agree stage payments linked to finished work, such as foundations, walls or first fix, and never pay the full amount upfront. A deposit makes sense when the builder must order materials made for your job.

The Consumer Rights Act 2015 says a trader must carry out a service with reasonable care and skill. If the work falls short, you can ask for it to be put right or for a price reduction. If you agree the contract in your home, you usually have 14 days to cancel; if you ask the builder to start within that period, you may have to pay for work already done.

Snagging and sign-off

At the end, walk the job and list the defects, known in the UK as a snagging list. Pay the final instalment once the snags are fixed and you hold the completion certificate or the competent person certificates, any Gas Safe paperwork and the guarantees.

Electricians and plumbers: same steps, their own register

For a smaller job, such as a new circuit or moving a sink, you may hire the specialist directly. The six steps still apply; only the register changes. In the US, electricians and plumbers are licensed at state or local level almost everywhere, so look them up separately and expect permits for most new circuits, panel changes, water heaters and gas lines. In the UK, check an electrician on a competent person scheme register. A plumber needs no registration to fit a tap, but must be Gas Safe registered to work on a boiler, a gas hob or a gas pipe.

Red flags on both sides of the Atlantic

• Knocking on doors after a storm, or offering a deal on “materials left over from a job nearby”.
• Cash only, or a discount for cash with no paperwork.
• “No permit needed” or “you don’t need Building Regs” for work that changes structure, wiring or gas.
• A large payment, or the full amount, before work starts, and pressure to sign today.
• No written quote, no fixed address, only a first name and a mobile number.
• Reluctance to give a license number, an insurance certificate or scheme membership.

Using a free Hirovo job post to reach tradespeople

Posting a job on Hirovo is free. Paste your scope into the post, choose the trade, and set the country, city and district. The post is published in the job listings for that country and region, which you can browse from the pages for the United States and the United Kingdom. People nearby who do that work see it and can apply or message you in the app. You decide whom to invite for a site visit and a quote.

Hirovo does not verify the people who reply or run background checks, and it is not an employer or an intermediary in the work you agree with them, so licensing, insurance, the contract and permits remain your responsibility. Run every check in this guide on anyone who responds. For wording the post, see how to write a job post; if you also want regular help at home, our guide to hiring a house cleaner follows the same approach.

In short

Write the scope first and send the same page to everyone. Verify licensing or registration and insurance on the official register, not on the contractor’s own paperwork. Compare written bids or fixed quotes, sign a contract that covers materials, dates, payments and changes, and pay in stages that follow finished work. In the US, permits and lien waivers protect you; in the UK, Building Control sign-off, Part P certificates and Gas Safe registration do. Hold the last payment until the work is inspected and the paperwork is in your hands.