N4 Gas Limited · Last reviewed: April 2026 · Version 2.0
We've written these terms in plain English because we think you deserve to understand what you're agreeing to. There's no small print designed to catch you out — these terms exist to make things clear and fair for both sides.
If anything doesn't make sense, call us on 0208 050 4729 or email [email protected] and we'll explain it properly.
Registered in England & Wales · Company No. 6472503
VAT No. 925 488 100
Registered office: First Floor, 677 North Finchley High Road, London, N12 0DA
Email: [email protected]
Phone: 0208 050 4729
Gas Safe Registration: 213743
Throughout these terms, "we", "us" and "N4 Gas" refer to N4 Gas Limited. "You" or "the customer" means the person or business who has requested work to be carried out and to whom any quote, invoice or job documentation is addressed. That person or business is the account holder.
We are Gas Safe registered heating engineers based in North London. Gas is all we do. These terms apply to everything we do for you — domestic or commercial.
A contract between you and us is formed when you request work and we agree to carry it out. You can place a request by:
Once we have agreed to carry out your request, a contract exists between us and these terms apply to it. We will create an account for you if one doesn't already exist.
We reserve the right to decline any request for work, without having to give a reason. We also reserve the right to stop work mid-job if, on arrival, we find the situation makes it unsafe or impractical to continue — for example if access is blocked, the property is unsafe, or the work is materially different from what was originally described. See Section 6 for more on this.
By requesting work from us, you confirm that the information you've provided is accurate. If we find out later that key information was wrong or misleading, we may charge additional costs, adjust the scope of work, or end the contract.
There's an important difference between an estimate and a quote, and we want to be clear about it:
| What we give you | Is it binding? | What it means |
|---|---|---|
| Verbal estimate | No | A rough guide only — the final cost may differ depending on what we find on the day |
| Written quotation (with quotation number) | Yes | A fixed price for the work described — what you see is what you pay on completion |
A written quotation is valid for 28 days from the date it was issued, and only applies if the work is booked to start within 90 days of that date. If either deadline passes, we may need to requote.
All prices we give you — verbal or written — are exclusive of VAT unless we specifically say otherwise. VAT will be added to your invoice at the rate applicable on the date the invoice is raised. The current rate is on the HMRC website at gov.uk/vat-rates.
Our prices include taking away and disposing of any old materials we remove as part of the job — your old boiler, pipework offcuts and so on. If you want to keep something (for example, a copper cylinder you'd like to reuse), just let us know and we'll adjust the price if needed.
A price we give you is for you personally and the specific work described. We can't transfer a price to a different customer or a different property unless we've confirmed in writing that we're happy to do so.
If a written quotation has been accepted and something unexpected comes up during the work that changes what's needed, we will always tell you before doing any additional work and give you a clear price for it. We will never just do extra work and add it to the bill without telling you first.
Once work is complete, we'll raise an invoice. Payment is due within 14 days of the invoice date, unless your account terms specifically say otherwise. If you're not sure when your invoice is due, it will say clearly on the invoice itself.
Some jobs — particularly larger installations — require a deposit before work begins. If a deposit is needed, this will be stated clearly on your quotation. Deposits are non-refundable if you cancel with less than 1 working day's notice (see Section 5 for full cancellation terms).
If you believe there's an error on your invoice, please tell us as soon as possible and no later than 30 days after you receive it. After that point, we'll assume you're happy with it and the full amount becomes due.
Any materials we supply — parts, appliances, equipment — remain our property until you've paid for them in full and payment has cleared. If you don't pay, we may ask for the materials back, and if that doesn't happen, we'll take legal steps to recover them or their value.
If a payment is overdue, we may charge interest at 3% above the Bank of England base rate, calculated daily from the due date until payment is made. This applies whether or not we've formally demanded payment.
If an amount remains unpaid for more than 90 days, we may pass the debt — including any accrued interest — to a debt recovery agent. We'll also add a processing fee to cover our costs. The fees are:
| Debt amount | Processing fee (added to debt) |
|---|---|
| Under £500 | £90 |
| £500 to £3,000 | £195 |
| Over £3,000 | £315 |
We don't want to get to that point — if you're struggling to pay, please contact us as soon as possible and we'll try to find a reasonable solution.
If you take out a finance or repayment agreement, you must meet the terms of that agreement. We are not responsible for the terms of any third-party finance arrangement.
We understand things come up. Here's what happens if you need to cancel:
| Notice given | Materials ordered? | Deposit paid? | What happens |
|---|---|---|---|
| More than 1 working day | No | No | No charge — you can cancel freely |
| More than 1 working day | Yes | Yes / No | You pay any restocking or return carriage costs we've incurred. If a deposit was paid, any remaining deposit balance is returned within 90 days of your written request. |
| Less than 1 working day | Any | Yes | The deposit is forfeited to cover our costs. |
| Less than 1 working day | Any | No deposit | You'll be charged 50% of the estimated labour cost, up to a maximum of £200 + VAT. |
What counts as "1 working day"? Working days are Monday to Friday, excluding bank holidays. If your job is booked for a Monday morning, you'd need to cancel by the close of play on the preceding Friday for it to count as more than 1 working day's notice.
If we turn up at the agreed time and can't carry out the work through no fault of our own — for example, if access hasn't been arranged, the property isn't as described, or there's a situation that makes it unsafe to proceed — a minimum charge of £40 + VAT will apply, plus any parking costs we've incurred (see Section 6). We'll always discuss the situation with you first and try to find a way to resolve things.
When we come to you, we need to be able to park our van somewhere safe and practical. We'll bring tools and often materials, so we need to be reasonably close to the property. We ask you to either provide a suitable space or give us a parking permit for the duration of the job.
Any parking costs we incur — paid bays, permit charges, or unfortunately a penalty charge notice if no suitable parking was available — will be added to your invoice. We'll make every effort to avoid this, but ultimately it's a cost of getting the job done and we can't absorb it.
We need the property and the working area to be a safe place for our engineers to work. This means:
We reserve the right to stop work and leave if we believe conditions are unsafe for our team, and we may still charge for time already spent on site.
We'll need access to a toilet and handwashing facilities while we're on site, as well as a potable (drinkable) water supply — particularly for jobs involving flushing, filling or testing pipework. If this isn't possible, please tell us when you book so we can make appropriate arrangements.
Our work is subject to the availability of parts, appliances and materials. If something we've quoted for isn't available, we'll let you know as soon as possible and offer a suitable alternative where we can — you're not obliged to accept an alternative, and if you don't, we'll discuss your options with you.
Every repair and installation we carry out comes with a 12-month warranty on both parts and labour. If the same fault returns within 12 months of us completing the work, we'll come back and fix it at no extra charge.
Our 12-month warranty covers the specific work we've carried out and the parts we've supplied as part of that work. It begins on the date the work is completed.
New appliances — such as boilers — typically come with an extended manufacturer warranty on top of our 12-month warranty. These are offered by the manufacturer directly and are subject to their conditions (which usually include annual servicing by a Gas Safe registered engineer to keep the warranty valid).
We register new boiler warranties on your behalf on installation day, but the manufacturer's warranty is their obligation, not ours. If you need to make a claim under a manufacturer warranty, we'll do everything we can to help, but any decision rests with the manufacturer.
Our 12-month warranty is automatically void if, between our completion of the work and the date of a warranty claim, anyone other than an N4 Gas engineer has interfered with, modified or worked on the parts or systems covered by that warranty — unless we've specifically authorised them to do so in writing.
Our 12-month warranty is genuine and we stand behind it. But there are certain things it doesn't — and can't reasonably — cover. These are:
| What's excluded | Why |
|---|---|
| Bleeding radiators or clearing airlocks | Air can re-enter a system for many reasons unrelated to our work |
| Topping up or adjusting system/boiler pressure | Pressure changes are a normal part of system operation and don't indicate a defect in our work |
| Adjusting user-operated controls (clocks, thermostats, dials, switches) | These are designed to be operated by the end user and any issues are not a result of our work |
| Damage caused by someone else interfering with the system after our visit | We can only warrant our own work |
| Repairs to appliances or systems over 7 years old | Older systems have pre-existing wear and additional failures are not attributable to our repair |
| Noises, smells or other sensory issues | These are highly subjective and rarely indicate a defect in workmanship — we'll investigate, but they're not automatically a warranty claim |
| Failures that result from ignoring our advice | If we flag something and you choose not to act on it, we can't be responsible for what happens as a result |
| Issues caused by third-party systems, products or installations we didn't install | We can only warrant work we've carried out ourselves |
| Blockages from scale or sludge in pipework | These are caused by water chemistry and system age — not by how a repair was carried out |
None of this list is designed to get us out of genuine warranty issues — it's here to be clear about things that would never fairly be called a warranty problem in the first place. If you're ever unsure whether something is covered, just call us and we'll tell you honestly.
When we carry out gas or heating work, we sometimes need to access pipework that's behind walls, under floors or within fitted furniture. We'll do everything we can to minimise disruption, but we don't include — and won't carry out — any decoration or finishing work afterwards. Filling holes, painting, replacing floor coverings, boxing things in — that's for you or your decorator. We'll leave the area clean and tidy, but not made good to a decorated finish.
If we need to isolate the power supply to a property or section of it as part of our work, we're not responsible for electronic equipment that fails to restart correctly, needs resetting, or loses its settings as a result. Things like smart home systems, alarm panels, set-top boxes and similar devices may need attention after a power cycle — that's not something we can control.
We take our appointments seriously and always try to be on time. However, we won't pay financial compensation for missed or delayed appointments, incorrect parts, or for situations where an appliance or system fails to work for reasons outside our control.
Nothing in these terms removes your legal rights as a consumer or limits our liability for anything that legally cannot be excluded — such as death or personal injury caused by our negligence, or fraud.
Subject to the above, our total liability to you arising out of or in connection with any contract is limited to the value of the work carried out under that contract. We are not liable for indirect or consequential losses — for example, loss of earnings because your heating was off.
We are fully insured for public liability and for all the work we carry out. We are Gas Safe registered (No. 213743) and all gas work is carried out in accordance with applicable Gas Safe regulations and British Standards. You're in safe hands.
To help us get the job done well, we ask you to:
Warranties on parts are subject to clause 3.3 (ownership of materials) — parts remain our property until paid for in full.
Gas safety is a serious matter. If we identify a fault or safety concern during our visit and recommend further work or action, please take it seriously. We won't pressure you into spending money, but we will tell you honestly if something is unsafe — and if you choose not to act on that advice, we can't be responsible for what happens as a result.
We genuinely want to know if something has gone wrong. It happens and we really do want our customers to get the best service. Most issues can be resolved quickly with a phone call. Please get in touch as soon as possible — the sooner we know about a problem, the faster we can sort it.
If you're a domestic customer and we can't reach an agreement, you may be able to escalate your complaint through:
We'd always prefer to resolve things directly and fairly. Most issues we've ever had with customers have been resolved with a conversation. Please give us the chance to put things right before escalating.
We may update these terms from time to time — for example if we change how we work, if the law changes, or if we want to clarify something. We'll always publish the current version on our website, along with the date it was last reviewed.
The version of these terms in effect at the time you request work from us is the version that applies to that contract. A change to these terms after a contract has been formed doesn't affect that contract.
These terms are governed by the laws of England and Wales. Any disputes that can't be resolved between us will be subject to the exclusive jurisdiction of the courts of England and Wales.
N4 Gas Limited · Company No. 6472503 · VAT No. 925 488 100 · Registered in England & Wales · Gas Safe Reg. 213743