Do I Need a HETAS Certificate to Sell My House?

No — there is no legal requirement to hold a HETAS certificate in order to sell your house. But if the property has a wood burner, multi-fuel stove or any solid-fuel appliance installed since April 2005, the buyer's solicitor will almost certainly ask for proof it was signed off under Building Regulations Part J. That proof is normally a HETAS Certificate of Compliance or a building control completion certificate. If you cannot find one, you have three routes: retrospective building control sign-off, a fresh inspection by a registered installer, or indemnity insurance. A missing certificate delays sales far more often than it kills them.

What a HETAS certificate actually is

Installing a wood-burning or solid-fuel appliance is notifiable building work under Part J of the Building Regulations in England and Wales, and the equivalent Building Standards in Scotland and Northern Ireland. Part J deals with combustion appliances: the hearth, the flue, the ventilation, the distance to combustible materials, the carbon monoxide protection. It exists because badly installed stoves kill people.

There are two lawful ways to satisfy it.

The first is to use an installer registered with a government-authorised competent person scheme — HETAS for solid fuel, OFTEC for oil, Gas Safe for gas, with NAPIT and BESCA also covering solid fuel. That installer certifies their own work and notifies the local authority on your behalf. You receive a Certificate of Compliance, and the council issues a building regulations compliance notice, usually within about 30 days.

The second is to submit a building notice or full plans application to building control before the work, have it inspected, and receive a completion certificate. Perfectly valid, just slower and usually more expensive — which is why the competent person route dominates.

So when a buyer's solicitor asks for "the HETAS certificate", what they actually mean is: show me this stove was notified and signed off. A building control completion certificate answers the question just as well. So does a HETAS certificate from a NAPIT-registered installer's equivalent scheme. Do not let anyone tell you only one specific piece of paper will do.

When you genuinely need paperwork — and when you don't

This is where a lot of unnecessary worry starts. Not every fireplace triggers Part J.

That last row deserves saying plainly. DIY stove installation is legal — you are allowed to do the work — but you were always required to notify building control first. Plenty of people did not. If that is you, deal with it now rather than three weeks before exchange, when you have no leverage and no time.

What the buyer's solicitor will actually ask

You will complete a TA6 Property Information Form, which asks directly about building works, alterations and the certificates that go with them. A stove is an alteration. Answer honestly.

Then come the pre-contract enquiries. Expect some version of:

• When was the wood burner installed, and by whom?
• Please supply the HETAS or building regulations certificate.
• Has the chimney been lined, and when?
• When was the flue last swept, and is there a sweep's certificate?
• Is there a carbon monoxide alarm in the room?
• Is the property in a smoke control area, and is the appliance DEFRA exempt?

Have those six answers ready in a single email before the enquiries arrive and you will remove roughly a fortnight from the conveyancing. That is not an exaggeration — most stove-related delay is not the missing certificate itself, it is the two-week ping-pong between solicitors while someone goes looking for it.

If the certificate is missing: your four options

1. Ask HETAS for a duplicate (do this first, always)

HETAS keeps records of the notifications its registered installers submit. If a registered installer fitted the stove, there is a record — even if your copy went in the bin during a house move. You will need the address, an approximate date, and ideally the installer's name or the data plate number. A duplicate is typically free or a nominal fee, and it is a complete answer. Around a third of sellers who think they have a problem do not actually have one.

2. Retrospective building control sign-off (regularisation)

Apply to your local authority building control for a regularisation certificate. A surveyor inspects the installation and, if it complies, issues a certificate. If it does not, you will be told exactly what needs changing.

Councils publish their own fee scales. A representative solid-fuel appliance tariff sits around £330 where you can supply a HETAS or installer certificate and about £550 where you cannot, so budget £300–£700 depending on your authority. Add the cost of any remedial work and of exposing parts of the installation for inspection.

Important sequencing point: once you approach the council, indemnity insurance is off the table. Insurers will not cover a risk you have already flagged to the enforcing authority. Decide which route you want before you pick up the phone.

3. Fresh inspection and certification by a registered installer

A HETAS-registered engineer can inspect an existing installation and issue a report on its compliance and safety. Strictly this is not the same as a retrospective Certificate of Compliance for work someone else did, but a detailed safety and compliance report from a named, registered engineer carries real weight with buyers and their solicitors. Expect £150–£350.

Where this route earns its money is when it finds something. An unlined flue, an inadequate hearth, insufficient air supply, a stove sited too close to a timber mantel — these are the findings that matter far more than the missing paperwork ever did.

4. Indemnity insurance

A one-off "lack of building regulations" policy, typically £20–£150 for a normal residential value, bought by the seller and handed to the buyer. It covers the cost if the local authority takes enforcement action.

Two things it does not do, and conveyancers do not always spell this out: it does not make the installation safe, and it does not help with a declined home insurance claim after a chimney fire. It is a conveyancing lubricant, not a remedy. Note too that the council's enforcement powers under section 36 of the Building Act 1984 generally expire twelve months after completion of the work — so for a stove fitted in 2013, the enforcement risk the policy insures against was already close to theoretical. You are largely buying the buyer's solicitor's peace of mind.

A worked example

A Victorian terrace in Sheffield, on the market at £215,000. Stove fitted by the previous owner in 2016, no certificate anywhere in the paperwork. Buyer's solicitor raises it in week four.

Compare that with the alternative: a £90 indemnity policy, a sale that completes on time, and a hearth that is still 30mm short under someone else's family. On a £215,000 sale, £880 is four-tenths of one per cent. The buyer in this case paid the asking price and the stove became a selling point rather than an enquiry. If you can afford to do it properly, do it properly. Indemnity is for when you genuinely cannot — a repossession deadline, a probate completion date, a chain about to collapse this week.

The safety questions that matter more than the paperwork

It is easy to spend six weeks on a certificate and never check whether the stove is actually safe. Reverse that order.

• Carbon monoxide alarm. Part J has required a CO alarm with any new solid-fuel appliance installation since October 2010, and the Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022 extended the requirement across rented homes in England from 1 October 2022. If your stove room has no alarm, fit one today. They cost about £20 and buyers notice.
• Flue liner. An unlined masonry chimney serving a modern stove is the single most common serious finding. Modern stoves burn hotter and cleaner than open fires, and flue gases behave differently.
• Annual sweeping. Keep the certificates. A HETAS-approved or Guild of Master Chimney Sweeps certificate is cheap reassurance, and several home insurers require annual sweeping as a policy condition — a fact people discover at claim stage, which is the worst possible moment.
• Air supply. Stoves above 5kW generally need a dedicated permanent air vent. Modern airtight houses make this more important, not less.
• Tell your insurer. An undeclared solid-fuel appliance can invalidate cover. This is a thirty-second phone call.

Smoke control areas, DEFRA exemption and Ecodesign

Separate from Building Regulations, and frequently conflated with them.

Most UK urban areas are smoke control areas. In one, you may only burn authorised fuels, or burn any fuel in a DEFRA-exempt appliance. Local authorities in England can issue civil penalties for emitting smoke from a chimney in a smoke control area under powers strengthened by the Environment Act 2021.

Separately, since 1 January 2022 every new stove sold in the UK must meet Ecodesign standards — broadly at least 75% efficiency and sharply reduced particulate emissions. This applies to appliances placed on the market, not retrospectively to the one in your living room. An older stove does not become illegal; it simply cannot be sold new.

For a seller, the practical points are short. Check your address on your council's smoke control map. Check whether your appliance is on the DEFRA exempt list. Put both answers in your enquiry pack. It costs you ten minutes and it heads off a question you would otherwise answer in week six.

• April 2005when stove installs became self-certifiable
• 30 daysfor an installer to notify the council
• 12 monthscouncil enforcement window under the Building Act
• £300–£700typical regularisation cost

Does a missing certificate affect your price or your timeline?

Price: rarely, and not by much. Valuers do not deduct for it. What a buyer might do is ask for a retention or a reduction equal to the cost of sorting it — so somewhere between £100 and £900 on the numbers above. If a buyer asks for £5,000 off over a missing stove certificate, they are using it as a lever for something else entirely, and you should say so.

Timeline: yes, and this is the genuine cost. Around one in four agreed sales falls through before exchange, and the mechanism is almost never a single catastrophic problem. It is accumulated delay. A missing certificate that takes six weeks to resolve is six more weeks in which a buyer's circumstances change, a mortgage offer expires, or a chain above you breaks. On an open-market sale already running 16–24 weeks from listing to completion, that matters.

Which is why the order of operations is the real advice here: find out about the certificate before you list, not after you have a buyer. Dealing with it in the fortnight before photographs costs the same money and none of the momentum.

When selling to a cash buyer makes sense — and when it doesn't

Let us be honest about scale. A stove certificate is a few hundred pounds and a few weeks. Selling to a cash buyer at 75–85% of market value costs you tens of thousands. Those are not comparable problems.

A quick sale is sensible when the certificate is a symptom of a wider situation rather than the situation itself:

• Probate. The grant runs roughly 8–16 weeks, the house is empty, nobody knows the stove's history and no one in the family wants to project-manage a building control application from two hundred miles away.
• Repossession or arrears, where a court date is fixed and a 20-week conveyancing process is not available to you.
• A property with several unresolved compliance issues — no gas certificate, no electrical certificate, an unsigned-off extension, and the stove. Individually trivial, collectively a project. Our sell house fast guide covers how those sales run.
• A chain collapse with an onward purchase you cannot lose.

It is the wrong answer when the stove certificate is the only issue, when you have equity to protect, when you have more than about eight weeks, or when the house would sell normally without difficulty. Trading £30,000 of value to avoid a £330 council fee is not a decision anyone makes calmly, and no reputable buyer should encourage it.

Checking a cash buyer properly

If you do go down that road, the sector has no statutory regulator, so two voluntary schemes do the heavy lifting: the National Association of Property Buyers (NAPB), whose members sign a code of practice, and The Property Ombudsman (TPO), which provides independent redress. Check both on the schemes' own registers, not on the buyer's website.

Then: look the company up on Companies House, ask for proof of funds within 24 hours, get the offer in writing with its assumptions stated, and confirm there is no fee for withdrawing. Typical genuine offers land at 75–85% of market value; anything advertised above about 82% deserves scrutiny, because headline figures are the ones that get revised after the survey. Watch for the late reduction two days before exchange — it is the industry's most persistent bad habit. Our house-buying company comparison and industry data are the right starting points.

Frequently asked questions

Can I sell a house with a wood burner and no HETAS certificate?

Yes. There is no law preventing it. You disclose the position on the TA6, and the buyer's solicitor decides whether to accept indemnity insurance, require regularisation, or proceed regardless. Cash buyers generally proceed regardless. Mortgage buyers usually want one of the four routes above, and that is reasonable of them.

How much does a retrospective building regulations certificate cost?

Budget £300–£700 for the regularisation application, using published council tariffs as a guide — one representative scale charges about £330 for a solid fuel appliance where an installer certificate is available and about £550 where it is not. Add remedial work if the inspection finds something, and possibly the cost of opening up part of the installation so it can be seen.

Is indemnity insurance enough?

It is usually enough to complete the sale, which is the question conveyancers are answering. It is not enough to make the installation safe, and it will not help your buyer if an insurer declines a fire claim. If you have time and the stove is fine, regularise instead. Use indemnity when the clock genuinely does not allow anything else.

My stove was fitted before 2005 — what do I say?

Say exactly that: installed before April 2005, therefore predating the competent person scheme, so no certificate exists or should be expected. Back it up with anything dated — an old invoice, a house survey mentioning it, a photograph. Solicitors deal with this every week and accept it readily.

Do I need a certificate for an open fireplace?

Not if it is original and unaltered. If the chimney has been lined, a stove has been fitted, or the opening has been structurally altered since 2005, that work was notifiable and the certificate question applies to the work, not to the fireplace.

Will a missing certificate stop my buyer getting a mortgage?

Very unlikely on its own. Lenders lend against the property, and a stove is a small part of it. What happens in practice is that the lender's solicitor requires indemnity insurance or a certificate before completion. That is a condition, not a refusal — and it is why sorting it early is worth doing.

What to do this week

Three steps, in this order. Photograph the data plate on or near your stove and email HETAS to ask for a duplicate notification. Book a registered engineer to inspect it, because you want to know the truth about the flue whether or not the paperwork ever turns up. Then decide between regularisation and indemnity with a real inspection report in front of you, rather than guessing.

If the certificate is genuinely the least of your problems — probate, arrears, a collapsed chain, a house full of unresolved compliance issues — then comparing real cash offers is a reasonable thing to do, and doing it early beats doing it in a panic. Ready Steady Sell was founded by Lisa Hayes to make that comparison straightforward: checked, vetted buyers competing for the same property, so you see several genuine numbers rather than a single take-it-or-leave-it figure. It is free and there is no obligation to accept anything.

Worth reading next: how cash house buyers actually work, what your house is really worth, and property jargon explained for the rest of the acronyms your solicitor will use.