Boiler replacement and heating system upgrades
Boilers and Heating Systems
Boiler and heating system work covers replacing or upgrading a home's central heating source — typically a gas boiler — along with associated controls, and is carried out only by Gas Safe registered engineers where gas appliances are involved.
Definition
What boilers & heating involves
This service covers the installation, replacement and upgrading of domestic heating systems, most commonly gas combi, system or regular boilers, along with associated controls such as thermostats, zoning valves and smart heating controls. Any work on a gas appliance or gas pipework is carried out by a Gas Safe registered engineer, as required by law.
Suitable for
- Ageing or inefficient boilers needing replacement
- Households wanting improved heating controls or zoning
- New heating installations as part of an extension or renovation
Not suitable for
- Gas appliance work by non-Gas-Safe-registered individuals — this is a legal requirement
- Suspected gas leaks, which require an immediate call to the National Gas Emergency Service rather than a scheduled visit
Process
How the work is carried out
- 01
Assessment
Checking the existing system, flue route, gas supply and property heat loss.
- 02
Specification
Agreeing boiler type, output and controls suited to the property.
- 03
Installation
Removing the old appliance and installing the new system to current standards.
- 04
Commissioning
Testing the system and setting controls correctly.
- 05
Certification
Issuing a Gas Safe certificate and Building Regulations notification (via Gas Safe's Competent Person Scheme) for the completed work.
Typical timescale
A straightforward like-for-like boiler swap is typically completed within a day. Relocating the boiler, upgrading pipework, or fitting a new flue route can extend this to several days.
Cost guidance
Costs vary with boiler output, brand, and whether pipework or flue changes are needed. An itemised quotation follows a site assessment rather than a generic online estimate.
Limitations and exclusions
- Only Gas Safe registered engineers carry out work on gas appliances and gas pipework, in line with legal requirements
- Boiler manufacturer warranties are registered on installation but administered by the manufacturer, not by us
- Radiator and pipework upgrades beyond the boiler itself are scoped and quoted separately unless included at outset
Areas we cover
Boilers & Heating across Sussex, Surrey, Kent and South London
Local property styles, planning authorities and neighbourhood coverage for boilers & heating in each town we work in.
Evidence
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FAQs
Boilers & Heating FAQs
How do I know if my boiler needs replacing rather than repairing?
Frequent breakdowns, rising energy bills, an ageing appliance no longer supported by spare parts, or a failed efficiency check are common signals. We assess the specific appliance and give a straightforward recommendation rather than defaulting to replacement.
Will you register the installation with Building Control?
Yes. Gas Safe registered engineers can self-certify boiler installations under the Competent Person Scheme, which satisfies the Building Regulations notification requirement.
Can smart heating controls be added when replacing a boiler?
Yes, most current boilers are compatible with smart thermostats and zoning controls, which we can specify and fit as part of the installation.
Discuss your boilers & heating project
Tell us about the property and what you have in mind, and we'll arrange a site visit.
Last reviewed 2026-07-19.