Accreditation badges as marketing: FENSA, Gas Safe, NICEIC and the rest

Two kinds of badge, and the difference matters

UK trade accreditations fall into two broad groups. The first is legal registration: schemes you must be on to do certain work at all, or to self-certify it as compliant with Building Regulations. Gas Safe for gas work is the clearest example. The second is voluntary quality marks: trade associations, vetting schemes and directory badges that signal standards but are not required by law.

Homeowners rarely know which is which. That is an opportunity and a responsibility. The opportunity is to explain, in a sentence, what the badge entitles you to do. The responsibility is not to let a voluntary badge imply a legal status it does not have.

The main schemes at a glance

Check the scheme's own site for the current detail; rules and names change, and this table is a map rather than the territory.

Scheme	Trade	What it means	Legal status
Gas Safe Register	Gas engineers	The engineer is registered to work on gas appliances; the card lists which types	Required by law for paid gas work in the UK
NICEIC, NAPIT and similar	Electricians	The business is assessed and can self-certify notifiable electrical work under Part P	Voluntary scheme membership; needed to self-certify rather than notify building control
FENSA, CERTASS	Window and door installers	The installer can self-certify replacement glazing against Building Regulations	Voluntary scheme; the alternative is a building control application
TrustMark	Many trades	Government-endorsed quality mark operated through scheme providers	Voluntary; required for some government-funded energy work
Trade associations (FMB, NFRC, APHC and others)	Builders, roofers, plumbers and others	Membership of a body with its own vetting and standards	Voluntary
Directory badges	Any	Vetting by a commercial platform	Voluntary, commercial

How homeowners actually read them

Research into how people choose a tradesperson tends to find the same thing: badges are a reassurance, not a reason. Nobody picks a plumber because of a logo. Plenty reject one because the logo they expected is missing.

That means the marketing job is not to shout about accreditation but to make sure it is present at each point where the homeowner is deciding, as set out in what homeowners actually check before they ring a tradesperson. Van, website footer, Business Profile photos, quote template, invoice. The badge should never be the thing they have to look for.

Registration numbers turn a logo into evidence

A Gas Safe logo on its own is a picture. A Gas Safe logo with the registration number beside it is a claim anyone can check in thirty seconds on the register. The same is true of NICEIC, FENSA and the rest, all of which have public lookups.

Homeowners who check are a minority, but they are an influential minority: they are the ones who leave the detailed reviews and tell their neighbours. Put the number next to the badge everywhere the badge appears. It costs nothing and removes the one question a careful homeowner might otherwise ring a competitor to avoid asking.

Explaining the badge in one sentence

Most trade websites display logos and leave it there. A single line under each one does far more. "Gas Safe registered (number 000000), which means I am legally allowed to work on your boiler and you can check my card at the door." "FENSA registered, so your new windows come with a certificate for Building Regulations that you will need when you sell."

These sentences do two things. They turn jargon into a benefit the homeowner understands. And they are exactly the kind of plain explanation that gets quoted when Google's AI features answer a question like "do I need a certificate for new windows", a point explored in our piece on what AI Overviews now show for local trade searches.

The rules of the badge itself

Every scheme has brand guidelines for how its logo may be used, and most are strict about it. Common conditions include: only the registered business may display it, it must not be altered or recoloured, it must not be used in a way that implies the scheme endorses specific work, and it must be removed when registration lapses.

The lapsing point is where trades most often slip. A van wrapped in 2022 still shows a scheme the business left in 2024. That is a breach of the scheme's rules and, more seriously, a misleading claim to the homeowner. Audit the badges annually against what you actually hold.

Subcontractors and borrowed badges

A builder who brings in a gas engineer cannot display Gas Safe as if the building firm itself is registered. A window company whose fitters are FENSA registered through a different legal entity needs to be careful about whose name is on the certificate. The homeowner is entitled to know which business holds the registration for the work being done.

The clean way to handle it is to say so: "Gas work is carried out by our Gas Safe registered partner" with their number. It is honest, it is still reassuring, and it avoids a complaint to the scheme.

Badges in paid advertising

Accreditation is a strong line in a Google or Meta ad, but it attracts scrutiny. Ad platforms and the Advertising Standards Authority both expect claims to be substantiated, and a scheme logo in an ad is a claim. Keep the wording factual ("Gas Safe registered" rather than "the safest engineers in town") and make sure the landing page shows the number.

Google's Local Services Ads formalise this. Verification for the format in the UK has been reported to require trade-specific proof such as Gas Safe registration for heating engineers, and Google has replaced its Guaranteed and Screened badges with a single Google Verified mark that lists the relevant verifications. The details are in Local Services Ads in the UK: what tradespeople need to know.

What to do this month

• List every badge you display anywhere and check each is current.
• Add the registration number beside every logo on van, site, profile and paperwork.
• Write a one-sentence plain-English explanation under each badge on the website.
• Check the scheme's brand guidelines for anything you are doing wrong.
• Where a subcontractor holds the registration, say so and name them.

Frequently asked questions