Hampstead & London · In-house delivery
Boiler Installation in Hampstead & NW London — Replacement & New Boiler Fit
Boiler replacement and installation across Hampstead and London — gas-boiler work assigned to an appropriately qualified Gas Safe-registered engineer.
Boiler replacement starts with an assessment of the existing system, property and hot-water needs. Accepted work on a gas boiler is assigned to a Gas Safe-registered engineer qualified for that appliance category. Product warranties depend on the selected appliance and manufacturer terms — recorded in the written quote.
- Boiler Installation
- New Boiler
- Boiler Replacement
- Combi Boiler
- System Boiler
- Manufacturer Warranty
- Gas Safe
Covering 224 London neighbourhoods
Featured boiler installation neighbourhoods
Choose the page for your exact neighbourhood where one exists. Availability is always confirmed from your postcode.
Local service coverage
Boiler Installation by area
Browse dedicated boiler installation pages for every area we list. Availability is confirmed after reviewing the postcode and brief.
To discuss work, start a project brief with photos and details — this portal is not a photo portfolio.
E1
E14
E8
N1
N4
NW10
NW2
SE1
SE11
SE13
SE21
SW11
SW17
SW18
SW19
SW6
SW7
SW8
TW9
W11
W14
W2
W4
Looking for another postcode? Browse all areas or use the coverage checker.
Why Choose Hampstead On Demand?
- ✓Reviewed by the operating team, not a provider marketplace
- ✓The price basis is confirmed before planned work
- ✓A written quote or confirmed call-out terms before work
- ✓Postcode and property details considered during triage
- ✓Relevant trade credentials checked before work
Define the heat and hot-water requirement before selecting a boiler
A replacement brief should describe the building and demand, not start with a preferred model badge. Record property type, floor area where known, bathrooms, occupancy pattern, existing cylinders or tanks, simultaneous hot-water expectations, emitters, zones and planned renovation. Confirm the existing and proposed fuel. A combi, system, heat-only or non-gas heat source serves different arrangements, and no type is automatically best for every property. The survey should translate the brief into a design basis before appliance capacity, storage and controls are fixed.
Survey the existing system and service routes
The installer needs safe access to the existing heat source, gas supply where applicable, water-side system, controls, electrical provision, flue, condensate route and any hot-water storage. Existing pipe sizes, system condition and concealed routes cannot be confirmed from postcode or property age. Note known leaks, pressure behaviour, cold rooms and previous alterations. The proposal should say what will be retained, altered, cleaned, protected or replaced, and which unknowns require opening-up. A like-for-like sales description should not conceal material changes to the installation.
Make the appliance and system choice comparable
A useful proposal identifies fuel, appliance type, output selection basis, hot-water arrangement, controls, included accessories and assumptions about the existing system. It should explain how the chosen option addresses the documented demand without guaranteeing comfort or savings that have not been modelled. If alternatives are offered, compare their system consequences as well as product price: storage space, flow demand, zoning, electrical work, pipe alterations and future service access. Manufacturer warranty length and conditions belong to the named product and installation route, not to a generic boiler-installation claim.
Design air supply, flue and condensate routes with the appliance
Approved Document J covers air supply, discharge of combustion products and protection of the building for combustion appliances. Flue terminals, chimney use, cupboards and external routes therefore cannot be treated as decorative afterthoughts. Condensate disposal also needs an accepted route protected and detailed for the property. The qualified installer determines the technical method against manufacturer instructions and applicable regulations. External appearance, access equipment, penetrations, fire stopping and making good should be shown in the quote so a safe route is not improvised after delivery.
Controls and energy requirements follow the applicable standards
The heating design should identify programmer, thermostat, zoning and emitter-control changes, together with any electrical or hydraulic work needed to commission them. The applicable Approved Document L edition and transitional position depend on the project and regulatory timing, so a landing page should not publish one historic efficiency percentage as a universal current rule. The accepted route should record the standard applied, responsible installer and commissioning evidence. Predicted bill reductions or environmental outcomes require project-specific evidence and should not be invented from the new appliance rating alone.
Check planning, listed-building and freeholder constraints
Internal replacement does not automatically answer questions about an external flue, terminal, plume, condensate pipe, new opening or alteration to listed fabric. Planning Portal guidance says internal work is not normally a planning matter but advises checks for listed buildings and identifies conditions around external flues. Formal decisions remain with the local planning authority. Leasehold properties can also require freeholder or managing-agent consent and rules for common parts. The survey should record visible external changes and approval ownership before the installation programme is committed.
Name the registration and Building Regulations route
Installation of a gas appliance requires the appropriate Gas Safe route, including an operative qualified for the appliance and work category. Building Regulations approval or self-certification must also follow the applicable route. A registered person may be able to notify work and provide compliance evidence, but the exact responsibility should be written rather than assumed. Electrical, hot-water storage or other controlled work can have additional competence requirements. The quote should identify who notifies, which documents are expected and what the customer should do if a different approval route is required.
Commission and hand over the whole accepted installation
Handover should cover the installed appliance and the accepted system changes. Retain commissioning information, user instructions, controls guidance, applicable Building Regulations evidence, manufacturer registration details, product warranties and a clear list of work not included. Record isolation points and safe user operations without encouraging access to the appliance interior. Any outstanding defect or future recommendation should be separate from completed commissioning. Final payment follows the accepted quote and completion position; the website should not promise a one-day programme, universal warranty or fixed package price for an unsurveyed property.
Independent guidance relevant to this brief
These external sources explain safety, regulatory or consumer context. They do not confirm availability, diagnose the property or replace job-specific professional advice.
- GOV.UK: use a competent person scheme
Official guidance on self-certification, local-authority notification and compliance evidence for relevant building work.
- GOV.UK: Approved Document J
Statutory guidance for air supply, combustion products, flues, chimneys and protection of the building in England.
- GOV.UK: Approved Document L
The government landing page for energy-performance guidance, current editions and transitional context.
- Planning Portal: boilers and heating
Introductory England guidance on internal replacement, external flues, listed buildings and designated-area checks.
Boiler installation survey checklist
- Full address, property type, tenure, occupancy and floor area if known
- Existing fuel, heat source, cylinders, tanks, emitters and zones
- Bathrooms, likely simultaneous hot-water demand and planned alterations
- Safe photographs of plant, controls, flue, condensate and access
- Known pressure, circulation, leakage or existing-system issues
- Listed status, external-change context and freeholder documents
- Electrical, hot-water storage and other competence requirements
- Required programme constraints without treating them as a booking
Installation proposal and handover checks
- What demand evidence supports the appliance and system choice?
- Which pipework, controls, flue and condensate elements are included?
- Which Approved Document edition and notification route apply?
- Who is registered or competent for each controlled element?
- Who owns planning, listed-building and freeholder approvals?
- What commissioning and compliance records will be handed over?
- Which manufacturer warranty terms and exclusions are documented?
Frequently Asked Questions
How do I start a boiler installation brief?▼
Where do you accept boiler installation briefs?▼
Is Boiler Installation delivered by third-party traders?▼
How is boiler installation pricing confirmed?▼
Do I always need a site visit for boiler installation?▼
What boiler installation themes do people commonly brief?▼
What freeholder or building access notes help for a boiler installation brief?▼
Does a boiler installation brief always need Building Control?▼
Can I submit a boiler installation brief in London?▼
How is boiler installation work priced?▼
How long does a new boiler installation take in London?▼
What warranty applies to a new boiler in London?▼
Is boiler installation Gas Safe in London?▼
More topics: all FAQs · quotes & payments · service areas · plumbing
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How the brief works
Tell us what you need
Describe your project or issue using our online form or by phone.
Receive a quote
We review the request and respond with clear pricing or the next step.
Agree the next step
We confirm availability and agree any visit or work date with you.
Work delivered
Job-specific qualifications, registrations and insurance are confirmed first.
Follow-up
Workmanship has 12-month cover, subject to the published terms.
Boiler Installation Guides & Resources
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compareBoiler Brands Compared — Best Boilers for NW London Homes 2026
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