How many quotes should you get before hiring a tradesperson?

That is a recommendation, not a legal duty. No regulation obliges a householder to collect three prices before hiring a tradesperson. The rule of three is a consumer-protection convention, repeated across registration schemes and advice bodies because it works: it exposes the spread of prices, the spread of scope, and the firms that will not put anything in writing.

Where three quotes does become a formal requirement is in specific government exemption routes. Under the private rented sector minimum energy efficiency rules, a landlord claiming a high cost exemption must upload copies of 3 quotations from different installers, each showing that the cheapest recommended improvement exceeds £3,500 including VAT⁵. A separate payback exemption requires copies of 3 quotes from qualified installers plus cost calculations⁵. So the number is soft guidance for a homeowner and hard evidence for a landlord.

Why several quotes matter for price and fit

A single quote tells you what one firm would charge. Three quotes tell you what the market charges, and where the job sits within it. NICEIC's guidance is direct: especially for larger and more complex projects, it is always worth shopping around and comparing quotes⁹. The same logic applies to energy work, where the Energy Saving Trust recommends getting more than one assessment so different approaches and recommendations can be compared before deciding¹⁰.

The price effect is the obvious one. HETAS, the solid fuel registration body, recommends obtaining at least 3 quotes to ensure the best price for the service required⁷. Citizens Advice gives the same advice for oil deliveries, where it suggests at least 3 quotes from different suppliers¹¹. The pattern holds across trades: competition is the mechanism, and three is the minimum number that creates it.

Fit matters as much as price. Two installers can quote for the same boiler, heat pump or solar array and propose genuinely different designs: different unit sizes, different siting, different controls, different levels of making good. A second and third quote is how a householder sees those differences rather than accepting the first design offered. For retrofit work, the Energy Saving Trust notes that comparing approaches and recommendations before deciding is the point of getting more than one assessment¹⁰.

There is a limit to what quotes can settle. Which? research into heat pump uptake found that among homeowners who had difficulty receiving quotes, 18% found them tricky to compare¹². Getting three quotes does not automatically produce three comparable documents. That is a separate problem, and it is the one the next section addresses.

What a good quote should set out

A quote is not a number on the back of an envelope. The Consumer Protection Association sets out what a proper quote should contain: scope of work, materials and specifications, timescales, payment terms, guarantees and aftercare¹³. Those six headings are the test. A quote missing any of them is incomplete, whatever the total at the bottom.

The Renewable Energy Consumer Code goes further for its members. All work should be set out in a written quotation before it is carried out, specifying the extent of work, the nature of the fault and any limits to responsibility¹⁴. That is a scheme rule binding on code members, not a general legal requirement, but it describes the standard a householder should expect.

Written beats verbal. NICEIC advises householders to obtain at least three written quotations from different contractors¹⁵, and the RECC recommends at least three separate quotations before signing a contract¹⁶. A verbal estimate cannot be compared, cannot be checked later, and cannot support a complaint if the work diverges from what was described.

For work that needs building regulations approval, the quote should also say who is handling notification. Solihull Council's homeowner guidance tells householders to get at least 3 quotations for building work¹⁷, and the same principle applies to any job where a certificate or notification is part of the deliverable. If the quote is silent on certification, ask before signing.

Comparing quotes like for like

Three quotes only help if they describe the same job. The Consumer Protection Association's guidance on replacing double glazing is blunt: always get three quotes and ensure they are like for like¹⁸. The same instruction applies to a boiler, a heat pump or a rewire.

Like-for-like comparison means matching the six headings from the previous section across every quote. Does each quote cover the same unit or specification? The same extent of making good? The same certification and notification? The same workmanship guarantee period? The same payment schedule? Where one quote is silent on a line another quote prices, the totals are not comparable.

Where quotes diverge sharply, the divergence is usually in scope rather than in margin. Which?'s finding that 18% of homeowners with quoting difficulties found quotes tricky to compare¹² points at the same problem: the documents are not written to a common template, so the householder has to impose one.

When one quote may be enough

The rule of three has exceptions, and the guidance names them. NICEIC's advice to obtain at least three written quotes is qualified: unless it is minor work⁴. A small repair, a like-for-like replacement or a straightforward service call does not need three prices to establish a fair one.

For minor work, the protection comes from the written quotation itself rather than from competition. The RECC rule that all work should be set out in a written quotation before it is carried out, specifying the extent of work, the nature of the fault and any limits to responsibility¹⁴, applies to service and repair work as much as to installations. A single written quote that meets that standard is a better position than three verbal estimates.

Some regulated processes also set their own quotation timelines rather than a number of quotes. One gas network operator commits to issuing a non-standard quotation within 11 working days for certain jobs, and within 21 working days for larger ones¹⁹. A new domestic connection is quoted in an estimated 4 days, and a job involving 2 to 4 connections in an estimated 10 days²⁰. Those are service standards from the network, not a count of quotes a householder should gather.

Checking a tradesperson's credentials before you commit

Quotes should be gathered from firms whose registration can be checked. TrustMark's homeowner guidance places obtaining 3 quotes as step 2 of its hiring process³, and the scheme exists so that householders can verify a business before work starts. For electrical work, the registration to check is NICEIC or an equivalent competent person scheme⁴. For solid fuel and biomass, it is HETAS⁷. For renewable installations, it is MCS, and the Energy Saving Trust recommends getting quotes from at least three certified installers to make a fair comparison⁶.

The credential check is not a formality. A quote from an unregistered firm for work that requires notification may leave the householder without the certificate that building regulations approval depends on¹⁷. That is a cost that does not appear in any of the three quotes.

For energy installations specifically, the registration bodies and consumer codes are covered in more detail on the pages for MCS certified installers, TrustMark registered businesses and the Renewable Energy Consumer Code. The wider hiring process, from first enquiry to complaint, is set out in the pillar guide.

What it means for a household's energy independence

Getting three quotes is a small act with a large effect on the economics of energy independence. A household installing solar, a battery, a heat pump or a boiler is buying a system it will live with for years, and the price it pays is set at the quoting stage. Competition between three firms is the only lever a householder holds over that price.

The dependence that remains is structural. A quote is a price for equipment and labour, not a guarantee of performance, and the household still relies on the grid, a supplier, or a fuel delivery for whatever the system does not cover. The quote stage is where the household can at least ensure it is buying the right system at a checked price from a registered firm, rather than accepting the first offer.

The evidence on comparison is consistent across trades and sources. Citizens Advice, RECC, TrustMark, NICEIC, HETAS and the Energy Saving Trust all land on the same number: three. The number is not magic. It is the smallest count that produces a comparison, and a comparison is what turns a quote into a decision.