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Gas Cooker Installation in London: Rules, Steps and Costs

Engineer checking a London gas cooker installation

A gas cooker, hob or gas fire must be fitted by a Gas Safe registered engineer who is qualified for that type of appliance. The job usually takes a few hours when it is a like-for-like swap on an existing gas point. It takes longer if new pipework is needed. The engineer connects the appliance, tests the pipework for gastightness, checks it works safely and tells you what paperwork to expect. Below you will find the rules, the steps, the cost factors and what to check before and after the visit.

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TL;DR

  • Only a Gas Safe registered engineer can legally fit a gas cooker, hob or gas fire, and their ID card must show the right work category.
  • A like-for-like swap on an existing gas point is quick. A new gas point, a moved supply or a longer pipe run adds time and cost.
  • Every installation should end with a gas tightness test, a check that the appliance burns safely and clear information on certificates.
  • Get the job confirmed in writing, with the agreed price, before the engineer starts.
  • If you smell gas, do not wait for a booking slot: follow the emergency steps below.

Table of Contents

Who is allowed to fit a gas cooker, hob or gas fire

The law is clear on this. The HSE states that anyone employed to work on gas appliances in domestic premises must be Gas Safe registered and competent in that area of gas work. Competencies are printed on the back of the engineer’s Gas Safe ID card.

For cookers, the category to look for is ‘Cooker’. Gas Safe Register explains that this covers installing, commissioning, exchanging, disconnecting, servicing and repairing domestic cooking appliances, while ‘Range Cookers’ is listed separately. If you are buying a range cooker, ask for that category specifically. A gas fire has its own category too, so check the card against the appliance you own.

Two points catch people out:

The risks are real. RoSPA warns that badly fitted and poorly serviced gas appliances can cause gas leaks, explosions, fires and carbon monoxide poisoning. It also reports that approximately 7,500 unregistered gas fitters work in the UK, carrying out around 250,000 illegal gas jobs a year. A friend with a spanner or a general handyman is not a safe shortcut.

What happens during a gas cooker installation

A professional installation follows a sequence. Knowing it helps you judge whether the engineer is doing the job properly.

  1. Survey and confirmation. The engineer looks at the gas point, the position of the cooker, the kitchen units around it and the type of appliance. Gas Safe Register suggests confirming the job in writing, including the start date and duration, agreed price, warranties, after-sales service and contact details for both sides.
  2. Isolation. The gas supply to the old appliance is turned off and the old cooker is disconnected. If the old one is being removed, the supply is capped safely.
  3. Connection. The new cooker is connected to the gas supply pipework, with an isolation valve fitted so the supply can be shut off at the appliance in future.
  4. Testing the pipework. Under the Gas Safety (Installation and Use) Regulations 1998, anyone doing work that might affect gastightness must immediately test that the pipework is gastight and examined to confirm it was installed in line with the Regulations.
  5. Purging. Where work affects pipework through which gas can flow, purging, which removes air from the pipework, is required straight after the work so the supply is safe to use.
  6. Commissioning. The engineer lights every burner, checks the flame, checks the controls and confirms the appliance operates safely.
  7. Handover. You are shown how to use the appliance and told what paperwork you will receive.

If the engineer skips the pressure test or does not light each burner, ask why. These checks are not extras.

Clearances and kitchen layout

Where the cooker sits matters as much as how it is connected. Gas Safe Register states that free-standing gas cookers need a minimum of 20mm clearance to adjacent base units or surfaces on each side. Those with a high-level grill need at least 610mm of clear space above the grill. Check your cooker’s manual as well, as manufacturers may specify more.

Flats have an extra rule. Gas Safe Register says brand new gas cookers installed in flats must have a Flame Supervision Device, which shuts off the gas to the burners automatically if a flame goes out. Many London homes are flats, so confirm that your chosen model has one before you buy.

The same thinking applies to ventilation. Combustion appliances need air to burn properly. Approved Document J explains that they require ventilation to supply air for combustion and, for flueless appliances, to disperse the products of combustion outside. If you are planning an outdoor kitchen or a covered cooking area, the principles in this guide to BBQ ventilation under a roof are worth reading before you fix a position.

When you need new gas pipework

A straight swap on an existing, correctly positioned gas point is the simplest case. You need more work when:

  • you are moving from electric to gas and there is no gas point in the kitchen;
  • you are moving the cooker or hob to a different wall or an island;
  • the existing pipe is the wrong size, in poor condition or cannot reach the new position;
  • you are converting a kitchen and the supply must be rerouted around new units.

The regulations set a limit on where pipes may go. Installation pipework must not be installed where it cannot be used safely, having regard to the position of other pipes and services. In practice that means the engineer may refuse a route that is hidden, cramped or too close to electrical cables, and propose another.

Plan this before your kitchen fitter closes up walls or lays the worktop. A gas point moved late in a refit often costs more than one planned at the start. Our gas works service covers new gas points and pipework alongside appliance connections, so the same engineer can survey the whole job.

Hob, cooker, range cooker and gas fire: what changes

Appliance What is different
Free-standing gas cooker Usually the simplest: connect to the gas point, isolation valve, test and commission. Clearances at the sides and above the grill apply.
Built-in gas hob The engineer works around the worktop cut-out and cabinet space below. The gas point must be reachable and the hob must be installed to its manual.
Built-in gas oven Often a separate appliance from the hob. Check the engineer’s card covers ‘Cooker’.
Range cooker Needs the ‘Range Cookers’ category. A gas-fired range cooker with a flue must be notified to the Local Authority.
Gas fire Depends on whether it is flued, room-sealed or flueless. Ventilation, flue condition and the position of the fire matter.

For gas fires, Approved Document J notes that room-sealed appliances, or those with a directly connected ducted air supply, reduce ventilation energy losses and the risk of cold draughts. It adds that air supply provisions usually need to increase where a room contains more than one appliance. If you are adding a gas fire to a room that already has a boiler or another fire, tell the engineer at the quoting stage.

How much does gas cooker installation cost?

How much does gas cooker installation cost?

Prices vary with the job, not just the appliance. One published UK price guide estimates that connecting a freestanding gas cooker like for like costs about £75 to £150 and takes one to two hours. The same guide puts a built-in gas oven at £120 to £300, a new gas point at £200 to £400, moving the gas point at £150 to £500, and a new or long gas supply run at £400 to £1,250. Treat these as national estimates, not London quotes: London labour rates, access and parking often push prices higher, and emergency or out-of-hours callouts cost more than planned daytime work.

What moves the price:

  • Like for like or new position. A swap is cheap. A new gas point is not.
  • Length and route of pipework. Longer runs, concealed routes and solid floors take more time.
  • Appliance type. Range cookers and built-in combinations take longer to fit than a freestanding cooker.
  • Access. Fitted units, tight spaces and top-floor flats all add labour.
  • Timing. Planned weekday work costs less than a same-night callout.
  • Extras. Removing the old appliance, a new flexible hose, an isolation valve or a gas safety certificate may or may not be in the quote.

We do not publish a price list for gas installations, because the right price depends on what the engineer finds. What we do is quote a fixed price before work starts, so the figure you agree is the figure you pay on completion. Ask any engineer what the quote includes: the isolation valve, the testing, removal of the old appliance and any certificate.

Paperwork: certificates and notification

What you receive depends on the appliance. Gas Safe Register states that for a new gas hob or gas oven, the Building Regulations do not require the engineer to notify the installation. If the engineer chooses to notify, you receive a Declaration of Safety certificate. Gas-fired range cookers with a flue are the exception: they must be notified to the Local Authority.

For other new gas appliances, Gas Safe Register says that in England the engineer must notify the Local Authority unless the appliance is a flueless cooking appliance, and that you should receive completed commissioning documents. Keep every document with your property records. Landlords will want them to hand when they arrange annual checks. Our guide to the gas safety check explains what that visit covers and who needs one.

Looking after the appliance afterwards

The HSE advises that gas appliances, flues and pipework should be installed and maintained and serviced at least annually by a Gas Safe registered engineer. Between visits, watch for warning signs: yellow or orange flames instead of crisp blue ones, black marks around burners, a lingering smell of gas, or condensation on windows near the appliance.

Yellow-orange flame and black marks on gas hob

If you suspect an appliance is unsafe, stop using it. The HSE states it is illegal to use a gas appliance you suspect is unsafe. Turn it off and do not touch it until a Gas Safe registered engineer has checked it. If you smell gas or think there is a leak, open the windows, turn off the gas at the meter if you can reach it safely, avoid switches and naked flames, and call the National Gas Emergency Service on 0800 111 999. Then call an engineer.

Our perspective

In our experience, most delays on a cooker or hob job come from questions that could have been answered before the day: is there a gas point where the new appliance will sit, does the engineer’s card cover this appliance, and what exactly is in the price?

That is why we work the way we do. Our engineers are Gas Safe registered, and every job is quoted at a fixed price before work begins, so there are no surprises when the work is done. For a cooker or hob swap we want you to know what the engineer will do and what you will be given at the end.

If your plans involve a new gas point, a kitchen refit or a gas fire alongside other appliances, tell us early. A single survey that covers the pipework, the appliance and the ventilation is quicker and easier than three separate visits, and it keeps the gas side of your project in the hands of one accountable team.

the author

Book a Gas Safe engineer in London

If you have a cooker, hob or gas fire to fit, or a gas point to add or move, our gas works team covers homes, landlords and businesses across London. Our engineers are Gas Safe registered, you get a fixed price quote before work starts, and you pay on completion.

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If you are replacing a boiler at the same time, see our boiler installation service. For leaks or a smell of gas out of hours, our emergency call out line is answered 24/7.

Checklist before the engineer arrives

  • Check the engineer’s Gas Safe ID card, front and back, for the right category.
  • Confirm the appliance model, its gas type and whether it needs a Flame Supervision Device if you live in a flat.
  • Clear the space around the old appliance so the engineer can reach the gas point and isolation valve.
  • Know where your gas meter and emergency control valve are.
  • Ask for the price, what it includes and the expected duration in writing.
  • Ask what certificate or notification you will receive.

FAQ

How much does it cost to get a gas cooker installed?

It depends on whether the job is a like-for-like swap or needs new pipework. One UK price guide estimates £75 to £150 for a freestanding cooker swap, with new gas points and longer pipe runs costing considerably more. London prices are often higher. We give a fixed quote before work starts.

Can I fit a gas hob myself if I get it checked afterwards?

No. Gas Safe Register says it is illegal to fit a gas appliance without being registered and then have the work checked by a registered engineer. Both parties would be breaking the law. Book a Gas Safe engineer to fit it from the start.

Do I get a certificate after a gas hob or cooker installation?

Not always as a legal requirement. For a new hob or oven, Gas Safe Register says notification is not required, but if the engineer notifies it you receive a Declaration of Safety certificate. Flued range cookers must be notified to the Local Authority. Ask the engineer what you will receive.

How often should gas appliances be serviced?

The HSE advises at least annually by a Gas Safe registered engineer. Landlords have a legal duty to arrange annual gas safety checks, which our gas safety check guide explains.

Sources

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