CAI Registered Aerial Installer: What It Means and How to Check

The Confederation of Aerial Industries (CAI) is the UK trade association for aerial and satellite installers, formed in 1978. A CAI member firm has been assessed against the CAI’s codes of practice and conduct, employs qualified personnel whose work is subject to inspection, guarantees installations and equipment for a minimum of twelve months, and can be taken to the CAI’s complaints and arbitration process if things go wrong. Membership is voluntary, not a legal requirement — plenty of excellent installers aren’t members — but it is verifiable on the CAI’s own register, which is more than can be said for most trade claims.

Why accreditation matters more in this trade than most

Aerial installation is unregulated. There is no licence to obtain, no mandatory qualification, and no register you must be on. Anyone can buy a ladder and a van and start trading tomorrow, and some do.

That matters more than it would in a trade where the work is visible. Most of an aerial installation is on a roof you will never inspect, inside a wall you will never open, or expressed as a signal margin you have no way of measuring. A poor install and a good one look identical from the sofa — on the day. The difference shows up three winters later when the first real gale arrives, or the first time atmospheric conditions eat into a margin that was never there. This is the whole argument in our guide to why cheap aerial installation costs more.

So a verifiable third-party standard is worth something here, precisely because you can’t verify the work yourself.

What CAI membership actually involves

Applicants are assessed for compliance with the CAI’s published codes of practice and codes of conduct, which are recognised by broadcasters and government as industry best practice. Member firms:

Employ qualified personnel, whose work is monitored by a CAI inspector
Guarantee installations and equipment for a minimum of twelve months
Use tested equipment, with the CAI operating its own certification scheme for products such as coaxial cable, amplifiers and distribution components
Are subject to a complaints and arbitration procedure if a dispute arises

That last point is the practical one. If a non-accredited installer does a bad job and stops answering the phone, your options are Trading Standards, the small claims court, or absorbing it. With a member firm there is an industry body with a relationship with the installer and an interest in the standard of its membership.

The CAI also publishes the technical standards that competent installers work to — including the benchmark specifications for cable and components that separate genuine WF100-class coax from the contract cable that causes so many of the faults engineers get called out to.

How to verify a claim

This is the part most people skip, and it’s thirty seconds of work:

Ask for the CAI membership number. A member will have one and will give it without hesitation.
Check it against the CAI’s own register at cai.org.uk. The register is public. A logo on a van, a website or a leaflet is not evidence — logos are trivially copied, and lapsed members’ materials stay in circulation for years.
Confirm the trading name matches. Accreditation belongs to a firm, not to an individual who once worked for one.

If a number isn’t forthcoming, or the name doesn’t appear, that isn’t proof of incompetence — but it does mean the accreditation isn’t part of what you’re buying, and you should price and judge the job accordingly.

The other credentials you’ll see

Registered Digital Installer (RDI). A certification scheme under which installers who meet its requirements may describe themselves as Registered Digital Installers. It emerged around the digital switchover era, and you’ll still see the badge on established firms. It’s a positive signal; it’s less prominent now than it was, so its absence on a newer firm means little.

TrustMark. The government-endorsed quality scheme, under which the CAI acts as a scheme provider. A TrustMark-registered firm has been vetted for technical competence, customer service and trading practices.

Sky-approved / Sky-accredited. Means the installer is authorised to carry out Sky work specifically. Relevant if that’s the job; not a general competence badge.

Checkatrade, Which? Trusted Traders, Trustpilot and similar. Review platforms, not technical accreditations. They tell you about customer experience — punctuality, tidiness, communication — which genuinely matters, but they cannot tell you whether the signal margin is adequate or the bracket is rated for the wind load, because the reviewers couldn’t tell either.

“Fully insured”. Ask what insurance, and for how much. Public liability is the one that matters for roof work — an installer working at height above your property and your neighbours’ should carry meaningful cover. It is a fair question and any competent firm answers it easily.

The questions worth asking

Accreditation narrows the field. These questions do the rest, and the manner of the answer tells you as much as the content:

Which transmitter will you point it at, and why? A good answer names the transmitter and explains the reasoning. A vague one is a warning. You can check the answer yourself on our transmitter directory.
Will you measure the signal, and can I see the readings? The correct answer is yes and yes. Installation is a measurement job — see checking signal strength.
What cable will you use? You want to hear a benchmarked, CAI-approved specification, not “standard coax”.
What aerial, and what group? Should relate to your transmitter, not to what’s on the van. See aerial groups and aerial types.
What’s the guarantee, on parts and on labour, and is it in writing? Twelve months is the CAI minimum; many good firms offer more on workmanship.
Are you insured for work at height, to what value?
Is the quote fixed, and what would change it? Honest answers exist — discovering rotten timber under a bracket genuinely changes a job.

Red flags

Doorstep or cold-call selling, especially with urgency (“we’re in the area today”, “your aerial won’t work after the switchover”). Reputable installers quote after assessment and don’t need an answer immediately. Any claim that Freeview is about to be switched off should be checked against the actual position, which is that it runs to at least the end of 2034.
A price quoted before anyone has looked at the property. Ballpark ranges are fine; a firm price for an unseen roof is not.
“You need a new 4K aerial.” There is no such thing — see do I need a new aerial for 4K.
Cash only, no paperwork, no VAT number, no written guarantee.
Substantial payment up front. A deposit on materials for a large job is reasonable; full payment before work is not.
Reluctance to show you the meter.
A quote far below everyone else’s. Something is being left out, and it’s usually the cable, the bracket, or the guarantee. Our cost guide sets out what realistic prices look like.

Where we stand on this

Worth being explicit, since this page is on a commercial site: we don’t install aerials. tv-aerials.co.uk routes enquiries to installers who do — a local specialist where we have one, our national coverage partner elsewhere. That’s why we can publish a page telling you how to check credentials and what to ask, including questions that make it harder for anyone to sell you an aerial you don’t need. We’d rather send you to someone who does the job properly once than earn a referral on a job that fails in three years.

We also won’t claim every installer on our books is CAI-accredited, because that would be easy to write and not universally true. Membership is one useful marker among several; insurance, guarantee terms, willingness to measure and track record all count.

If you’d like a quote from an installer who’ll answer the seven questions above without flinching, send us your postcode. Each enquiry goes to one installation company covering your area — not a lead auction, and not a call centre working a script.