What should a gas engineer’s quotation include?
A gas engineer’s quotation should clearly list the proposed work, boiler or materials, labour, safety checks, VAT and any likely additional costs. It should also state what is included, when payment is due and how long the quotation remains valid, so you can compare it without guessing.
A reliable quotation gives you enough detail to decide whether the proposed work is suitable, not just what it will cost. It should describe the installation in plain language, identify the assumptions behind the price and show where the price could change.
First, check that the quotation describes the actual job. A replacement boiler quote should identify the boiler type, output and model, along with the heating controls included. It should also say whether the work covers a like-for-like replacement or changes to the system, such as relocating the boiler, altering pipework or replacing the hot-water cylinder.
Your home may need different work from the property next door. A boiler in a kitchen cupboard, loft or outbuilding can involve different flue routes, condensate arrangements and access requirements. The quotation should reflect what the engineer has seen, rather than relying on a standard package price.
Look for the work needed around the boiler. The price should make clear whether it includes:
- removing and disposing of the old boiler;
- the flue, flue terminal and any plume-management parts;
- gas, heating, hot-water and condensate pipework;
- system cleaning, filters or chemical treatment where appropriate;
- new controls, thermostats or motorised valves;
- brackets, isolation valves and other installation materials;
- making good around the old flue or pipework; and
- commissioning, testing and handover paperwork.
Missing items do not always mean the quotation is wrong. They may be excluded because they are not needed. The important point is that the quotation lets you see what has been allowed for and what remains your responsibility.
The boiler specification should be connected to your home. A larger output is not automatically better. Your heat loss, hot-water demand, number of bathrooms and available space all affect the suitable model and system type. If the quotation recommends a change, it should explain the reason in practical terms.
An engineer should also record relevant site conditions. A long flue route, difficult access, limited drainage or an old heating system can affect the work. Properties off the gas grid need a different assessment altogether, because an oil-fired appliance cannot be quoted as though it were a gas boiler. Gas Safe registration covers engineers working on gas appliances; it does not make an oil installation a gas installation.
Ask how the price deals with safety and compliance. The quotation should allow for the checks needed to commission the appliance safely. This includes checking the gas supply, combustion performance, flue integrity and ventilation where required. It should also state what certificates or records you will receive after the work.
If the new boiler connects to an existing flue or heating system, the engineer should explain any limitations found during the survey. A quotation based on an assumption that later proves incorrect may need to change, but you should be told what that assumption was before accepting the work.
Separate included work from possible extra work. Some items can only be confirmed once an engineer opens up the system. For example, corroded pipework, an unsuitable flue route or an inaccessible isolation valve may not be visible during an initial visit. A clear quotation should identify these as exclusions or potential variations, rather than presenting an artificially low total.
That does not give an engineer permission to add costs without discussion. If the proposed work changes, you should receive an explanation and a revised price before the additional work starts. For planned work, we set out the agreed work in writing before we begin, so you can make that decision with the relevant information.
Check the commercial terms as carefully as the technical details. A quotation should say whether it is a fixed price for the stated work or an estimate subject to a survey. It should identify any deposit, staged payment or balance payment, and explain how payment is made. It should also give the quotation’s expiry date, particularly if equipment or material prices may change.
Read the exclusions closely. Common examples include electrical alterations, building work, asbestos-related work, replacement radiators and repairs to unrelated parts of the heating system. An exclusion is not necessarily a problem. It becomes a problem when you discover it only after accepting the quote.
Compare quotations on the same basis. A cheaper figure may leave out controls, system cleaning, disposal or remedial work. A higher figure may include those items and a more complete specification. Put the quotations side by side and check the boiler model, controls, flue arrangement, warranty terms, commissioning, certification and all exclusions.
Also check who will carry out the gas work. Gas Safe registration is a legal requirement for anyone working on a gas boiler, and the business should be able to provide registration details for checking. Registration does not by itself tell you whether the quotation includes the right design or all the necessary work, so the written specification still matters.
A sound quotation leaves you knowing what appliance is proposed, what the engineer will change, what the price assumes and what paperwork will follow. If any of those points are unclear, ask for the quotation to be amended before you agree to it.
The quotation should explain what happens after the boiler is installed, not stop at the total price. It should say who registers the appliance warranty, which commissioning record you’ll receive and whether the manufacturer’s conditions require ongoing servicing.
That detail matters if a fault develops later. We set out the paperwork supplied at handover and any action you need to take, so you know which documents to keep and what the warranty covers before you accept the quotation.
