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Switching to a new heating system can cost more than the headline installation price because the quote may exclude work needed to make the system fit your home. In the UK, possible extras include radiator and pipework changes, a hot-water cylinder, electrical work, insulation or draught-proofing, access and scaffolding, and removal or disposal of old equipment. None applies automatically: an installer should assess what your property needs and which existing parts can safely remain.
Ask for an itemised, property-specific quote that states what is included, what is excluded, and how the proposed system is expected to perform and cost to run. The figures below are indicative UK examples, not current offers or universal prices.
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A headline price may cover the main equipment and standard installation but not every alteration the property needs. The gap depends on the existing heating system, the design chosen, the condition and suitability of components already in place, and practical factors such as access. A potential cost is not a guaranteed extra: the installer should explain whether it applies to your home and why.
Ask the contractor to separate the equipment, installation labour and associated work into clear line items. If a cost is excluded, request an estimate for it or a written explanation of what would trigger it. That makes it easier to compare proposals without assuming that the lowest headline figure covers the same work as a more detailed one.
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In its domestic heating factsheet, CIBSE lists possible additional costs including “radiator or pipework upgrades, electrical work, scaffolding, waste disposal, or the removal of your old boiler and oil tank.” These are examples to confirm with the installer, not a list of charges every household will face. The CIBSE heating and heat-pump factsheets encourage homeowners to clarify potential extras.
Which parts of the installation might cost extra?
The main hidden costs are changes to the home’s heat distribution, hot-water arrangements, electrical installation, building fabric, access, and removal of old equipment. Get each one assessed against the proposed system rather than assuming that every existing component must be replaced.
Radiators and pipework
Some existing radiators may not suit the design of a replacement system, so the installer may specify upgrades or replacements. Pipework might also need alteration; some heat-pump installation examples include insulated pipework. But neither a full radiator replacement nor wholesale repiping should be treated as inevitable. Ask the designer to identify which radiators and pipes can remain, which need work, and the reason for each recommendation.
Ofgem’s owner guidance for the Boiler Upgrade Scheme discusses insulation and possible radiator upgrades as considerations in a heat-pump installation. Its installer guidance also says suitable existing system components may be retained. The practical takeaway is to get a component-by-component assessment, not to accept a blanket assumption that everything must be new—or that everything can be reused.
Hot-water cylinder
A conversion may require a hot-water cylinder if the previous arrangement did not have one. Whether it is needed depends on the existing system and the system being installed. Ask whether the cylinder, associated pipework and installation are included in the quote. If the proposal excludes a cylinder that the design requires, the apparent saving in the headline price will not represent the whole job.
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Electrical work and supply
Electrical work can be an additional installation cost. Have the installer assess the property’s electrical requirements and state in writing whether any electrical changes or supply-related work are included. The available evidence does not establish that every home needs an upgrade, so ask for a property-specific explanation rather than budgeting for one automatically.
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Insulation and draught-proofing
Insulation and draught-proofing can affect heat loss, system performance and running costs. Discuss useful measures with the designer and ask whether they are prerequisites for the proposed design, recommendations to improve performance, or separate work you may choose to do. Do not assume that every household must complete every insulation measure before installing a new system.
Ofgem’s Boiler Upgrade Scheme property-owner guidance, version 5, applies to applications properly made on or after 28 April 2026 and addresses performance estimates and insulation considerations. It is scheme guidance, not a substitute for an assessment of your particular home.
Access, making good and removal
Scaffolding or other access arrangements may add cost where the work requires them. Ask whether the quote includes access equipment, removal of the old boiler or oil tank, waste disposal and making good any affected areas. The government’s consumer guide also flags the possibility of disruption during installation. The extent of disruption and repair work will depend on the actual job, so have the installer describe what will be opened, moved or removed and what will be reinstated.
What do published UK installation figures include?
RICS gives indicative UK figures of £12,000–£15,000 to install a heat pump in a home with a typical gas boiler and existing radiators and pipework. Its example includes a new hot-water cylinder, insulated pipework and upgraded radiators. RICS also gives £3,000–£4,500 as an indicative range for replacing a gas boiler while keeping the existing heating distribution system, subject to location and necessary pipework changes.
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These figures have different scopes and should not be treated as like-for-like quotations or as prices guaranteed for November 2026. The publication year is not stated on the RICS consumer guide page; the ranges below reproduce its indicative figures, checked November 2026, without updating or extrapolating them.
| RICS example | Indicative range | Stated scope and qualification |
|---|---|---|
| Heat-pump installation | £12,000–£15,000 | Home with a typical gas boiler and existing radiators and pipework; example includes a new hot-water cylinder, insulated pipework and upgraded radiators. |
| Gas-boiler replacement | £3,000–£4,500 | Existing heating distribution system retained; subject to location and necessary pipework changes. |
RICS’s domestic air-source heat-pump guide is the source for both ranges. The heat-pump example already includes several items that might otherwise be left out of a quote. A different property, design or installation scope may produce a different price. Use these figures as context for asking questions—not as a substitute for an itemised estimate.
Could running costs be a hidden cost too?
Yes. Installation price is only one part of the cost of switching: the energy used over time, servicing and maintenance also matter. A system described as more efficient does not guarantee a lower bill in every home. Ofgem notes that electricity’s higher cost relative to gas can lead to higher initial running costs in some properties, and recommends getting an installer’s estimate.
Ask for a running-cost estimate based on your property and the proposed system, and ask what energy prices or tariff assumptions it uses. A figure without those assumptions is difficult to interpret, particularly because energy prices and household use can change. Also ask what servicing and maintenance are expected and what conditions apply to any guarantee. The Ofgem owner guidance covers performance estimates and cautions about running costs; the government consumer guide advises checking servicing, maintenance and guarantee conditions.
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How can you compare quotes fairly?
Compare the complete scope and assumptions, not just the total at the bottom. Two quotes can appear to offer the same system while one includes work the other leaves to be priced separately.
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- Request an itemised total. Ask for a property-specific estimate with equipment, installation and associated work shown separately. Identify provisional or excluded items.
- Check the heat distribution. Ask which radiators and pipework are being kept, altered or replaced, and why. Confirm whether any pipe insulation is specified and included.
- Confirm hot-water arrangements. Ask whether a cylinder is needed and whether its supply, installation and connections appear in the total.
- Ask about electrical requirements. Find out whether electrical work or any supply-related changes are expected, whether they are included, and what the estimate assumes.
- Clarify building-fabric work. Ask which insulation or draught-proofing measures the designer considers useful, whether they are required for the proposed design, and whether they are part of this contract.
- Account for access and the old system. Confirm arrangements and costs for scaffolding or access, removal, waste disposal and making good.
- Interrogate performance and bills. Ask how the system is expected to perform in your property and what energy-price or tariff assumptions support the running-cost estimate.
- Read the ongoing terms. Check servicing and maintenance expectations, guarantees and any conditions you must meet.
- Check local requirements and support. Ask which permissions and incentives may apply to your address, and verify current scheme rules before deducting a grant from a quote.
Keep the answers with each proposal. If an installer cannot yet give a firm price for a possible extra, ask what needs to be inspected and when that amount will be confirmed. Do not sign on the basis of an assumed grant or a running-cost promise that has no stated assumptions.
Do grants, permissions or location change the total?
They can affect what you pay or what steps are required, but the rules are specific to geography, the property and the scheme. This article uses UK sources and UK cost examples; grants, planning requirements and electricity or gas network requirements can differ elsewhere and can change over time. Check the current rules for your address and the chosen technology with the relevant authority or scheme before treating an incentive as a discount.
For readers considering the UK Boiler Upgrade Scheme, Ofgem’s owner guidance version 5 applies to applications properly made on or after 28 April 2026. That date and scope matter: do not assume a rule applies to an application made outside that period, or that every home or installation qualifies. Ask the installer which permissions or grant conditions they believe apply, then verify them against current official guidance.
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What should you ask before signing?
Use these questions to expose omissions while there is still time to revise the proposal:
- Which radiators and pipework can remain, and why?
- Is a hot-water cylinder needed, and is it included?
- Does the electrical installation or supply need work, and is that included?
- Are insulation, access, scaffolding, removal, disposal and making good included or excluded?
- What property-specific performance and running-cost estimate are you providing, and what energy prices or tariff assumptions does it use?
- What servicing, maintenance, warranty and guarantee conditions apply?
- Which permissions or grants should be checked for this address?
A useful quote answers these questions explicitly or identifies what still needs an inspection. The aim is not to eliminate every possible uncertainty before work begins; it is to make the scope, assumptions and likely additional costs visible before you commit.
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Frequently Asked Questions
Can I keep my existing radiators when I change heating systems?
Possibly: suitability depends on the proposed system design and the condition and capacity of the existing radiators. Ask the designer to assess them individually and explain any replacement recommendation rather than assuming either that all can stay or all must go.
Will I have to leave my home during a heating-system installation?
That depends on the scope and disruption involved at your property; it cannot be determined from the system type alone. Ask the installer which rooms or services may be affected, for how long, and whether access or making-good work is planned.
Can a grant be deducted from my installer’s quote?
Only if you have verified that the property, installation and application meet the current scheme conditions and understand how the grant is applied. Treat an unconfirmed incentive as uncertain, not as guaranteed money off the amount you need to fund.
Should I get more than one heating-system quote?
More than one proposal can help reveal differences in scope, assumptions and exclusions, but the totals are useful only when you compare the same work. Give each installer the same information about the property and ask each to itemise the same cost categories.
