Landlord compliance

Boiler Installation

New boiler supply and installation by Gas Safe engineers, fully commissioned and registered.

From £2,509 (inc VAT) Typically installed within one to two days 12-month workmanship guarantee

Book this service 07426 409342

Starting from

£2,509inc VAT

starting price · fully installed, commissioned and registered

Correctly sized from a real heat loss calculation, not the old boiler's badge

System cleaned and treated to BS 7593 so your warranty stands

Magnetic filter fitted as standard

Building Regulations notification handled and lodged for you

Book online

Overview

What is a Boiler Installation certificate?

A complete boiler replacement: survey and correct sizing, supply of the appliance, removal of the old unit, installation, system treatment, commissioning to manufacturer specification, Building Regulations notification and warranty registration. We size the boiler to the property's actual heat loss rather than simply matching whatever was there before, because an oversized boiler cycles constantly, wastes gas and wears out faster.

Why it matters

Why it's worth getting right

A boiler replacement is the largest single mechanical investment most landlords make in a property, and the quality of the installation matters more than the badge on the front. The same appliance can deliver fifteen years of trouble-free service or fail repeatedly within three, depending on whether it was correctly sized, whether the system was cleaned and treated before the new unit went on, and whether it was properly commissioned. Those three things are where installations are quietly cut short to win on price.

Notification, commissioning and warranty

Installing a boiler is notifiable work under Part L and Part J of the Building Regulations. Because our engineers are Gas Safe registered, the installation is self-certified and the Building Regulations Compliance Certificate is issued to you and lodged with your local authority automatically — you do not need to arrange separate building control involvement. Under the Boiler Plus standard in force in England, new gas boiler installations must achieve a minimum seasonal efficiency of 92% ErP and include time and temperature controls, plus at least one additional energy-saving measure such as load compensation, weather compensation, flue gas heat recovery or smart controls. We register your warranty with the manufacturer on completion.

Regulations & standards

The rules this work is carried out to

Every inspection we do is measured against a published standard — here are the ones that apply to this service.

Boiler Plus

Minimum standards for domestic boiler installations (England)

92% ErP minimum, time and temperature controls, plus one energy-saving measure.

Part L & Part J

Building Regulations — efficiency and combustion appliances

Notifiable work; we self-certify and lodge the compliance certificate.

BS 7593

Water treatment in heating systems

System cleaning, inhibitor dosing and filtration on new installations.

In detail

Understanding your Boiler Installation

The technical detail behind the certificate — what gets checked, what the results mean, and the decisions that actually affect your property.

Combi, system or regular — choosing the right type

A combi boiler heats water on demand with no cylinder, which saves space and suits flats and smaller properties with one bathroom, but its hot water flow rate is limited by the incoming mains, so two showers running at once will disappoint. A system boiler works with a pressurised unvented cylinder and delivers strong simultaneous flow to multiple bathrooms, making it the right answer for larger family houses and most HMOs. A regular or heat-only boiler works with a traditional vented cylinder and a loft tank, and is usually retained where the existing pipework makes conversion disproportionately expensive. The decision should follow the property's bathroom count, occupancy and incoming mains flow rate — which we measure rather than estimate.

Why correct sizing matters more than headline output

Oversizing is the most common installation error in the UK, and it is counter-intuitive: a boiler that is too powerful is worse than one sized correctly. It reaches temperature quickly, shuts down, cools, and fires again — cycling repeatedly, which wastes gas, causes more wear than steady running, and shortens the life of the appliance. Correct sizing starts from the property's actual heat loss, calculated from floor area, construction, glazing and insulation, then adds hot water demand based on bathroom count and flow rate. A well-insulated two-bedroom flat rarely needs more than 24 kW, whatever the 35 kW unit currently on the wall might suggest.

System cleaning is not optional

Fitting a new boiler onto an old, dirty system is the fastest way to destroy it. Years of accumulated magnetite sludge sitting in radiators and pipework will migrate straight into the new heat exchanger, and manufacturers know it — most warranties are explicitly conditional on the system having been cleaned and treated to BS 7593 at installation. Our standard installation includes a full system clean, dosing with corrosion inhibitor, and fitting a magnetic system filter. Where the system is heavily contaminated we will recommend a power flush rather than a chemical clean, and we will explain why rather than adding it silently to the quote.

What the starting price covers, and what varies

Our installations start at £2,509 including VAT for a straightforward like-for-like combi replacement in the same position: appliance, removal and disposal of the old unit, installation, system clean and inhibitor, magnetic filter, commissioning, Building Regulations notification and warranty registration. Costs rise where the work genuinely changes: relocating the boiler to a different wall, converting between boiler types, upgrading gas supply pipework to meet the new appliance's demand, replacing a cylinder, adding a flue extension, or installing smart controls. We survey before quoting and give you a fixed price, so the figure you agree is the figure you pay.

Getting the warranty you were promised

Manufacturer warranties of seven to twelve years are common, but they are conditional and the conditions are enforced. The appliance must be registered with the manufacturer within the stated window, usually 30 days. The system must have been cleaned and treated at installation, and inhibitor levels maintained. The boiler must be serviced annually by a Gas Safe registered engineer, with documentation. Miss any one of these and a heat exchanger failure in year six becomes a bill rather than a claim. We register the warranty for you on completion and issue the documentation you will need to evidence the servicing history later.

Warning signs

Signs it is time to replace rather than repair

Repair usually wins until several of these are true at once — then replacement is the cheaper decision:

The boiler is more than 12–15 years old

Two or more repairs in the last two years

Parts becoming difficult or expensive to source

A repair quote approaching a third or more of replacement cost

An efficiency rating below current standards, showing in the gas bills

Repeated lockouts or a boiler that needs frequent resetting

Visible corrosion or leaks from the appliance body

Your EPC is being held back by an inefficient heating system

The risks

The cost of a poor installation

Most premature boiler failures we attend are installation failures, not appliance failures:

!Warranty refused where the system was not cleaned and treated at installation

!Constant cycling and inflated gas bills from an oversized appliance

!Sludge from an uncleaned system destroying a new heat exchanger within a few years

!No Building Regulations certificate, which surfaces and stalls a future sale

!Undersized gas supply pipework causing under-performance and lockouts

!Poor hot water performance from the wrong boiler type for the property

!Disrepair claims where a replacement leaves tenants without heat for days

Protecting the investment

Service the boiler annually from the first year — the warranty depends on it and so does the appliance's working life. Clean the magnetic filter at every service; if one was not fitted at installation, have one added, as it is a small cost that protects the most expensive component in the system. Keep inhibitor levels topped up, which is checked at each service, and avoid repeatedly topping up system pressure without investigating the cause, since fresh water means fresh oxygen and accelerated corrosion. Keep all installation and commissioning paperwork together with the annual service records, because that file is what a warranty claim or a property sale will depend on.

Why us

The benefits of booking your Boiler Installation with us

Accredited, transparent and built around making compliance easy.

Correctly sized from a real heat loss calculation, not the old boiler's badge

System cleaned and treated to BS 7593 so your warranty stands

Magnetic filter fitted as standard

Building Regulations notification handled and lodged for you

Manufacturer warranty registered on completion

Fixed price after survey — no mid-job additions

What's included

Everything covered in your Boiler Installation

One all-inclusive price — here is exactly what the engineer does on site and what you receive afterwards.

Full survey with heat loss calculation and mains flow rate measurement

Supply of the new appliance, correctly sized for the property

Removal and responsible disposal of the old boiler

Full system clean and dosing with corrosion inhibitor to BS 7593

Magnetic system filter fitted as standard

Commissioning to manufacturer specification with combustion readings recorded

Building Regulations notification and compliance certificate

Manufacturer warranty registered on your behalf

Pricing

Simple, all-inclusive pricing

The price you see is the price you pay — VAT included, with no hidden call-out fees. Your final price depends on the size of your property; we'll confirm an exact, all-inclusive quote before we attend.

Boiler Installation from

£2,509inc VAT

starting price · fully installed, commissioned and registered

Get my exact price

All prices include VAT · 12-month workmanship guarantee

Boiler installation pricing

Installation	Price (inc VAT)
New boiler supplied and installed	From £2,509.00
Relocation, type conversion or cylinder work	Quoted after survey

The starting price covers a like-for-like combi replacement in the same position, including system clean, filter, commissioning, Building Regulations notification and warranty registration. We survey before quoting and the fixed price we give you is the price you pay.

Prices are all-inclusive of VAT with no hidden call-out fees. Where they genuinely apply, parking (£5) and the London Congestion Charge (£18) are passed on at cost and always shown up front.

The process

How your appointment works

Simple, transparent and designed around you and your tenants.

Step 1

Survey and specify

We calculate heat loss, measure mains flow rate and recommend the right boiler type and output — then quote a fixed price.

Step 2

Remove and prepare

The old appliance is removed and disposed of, and the system is cleaned and dosed with inhibitor before anything new goes on.

Step 3

Install and commission

The new boiler, controls and magnetic filter are installed and commissioned to manufacturer specification with combustion readings recorded.

Step 4

Certify and register

Building Regulations notification is lodged, your warranty is registered, and we walk you and your tenant through the controls.

FAQs

Boiler Installation — frequently asked questions

Our installations start at £2,509 including VAT for a like-for-like combi replacement in the same position, covering the appliance, installation, system clean, filter, commissioning, Building Regulations notification and warranty registration. Relocations, type conversions and cylinder work are quoted after survey.

A straightforward like-for-like swap is usually a single day. Relocating the boiler, converting between types or replacing a cylinder typically takes two days. We will confirm before starting and let your tenant know how long they will be without heating.

It depends on bathroom count, occupancy and incoming mains flow rate. Combis suit flats and smaller homes with a single bathroom. System boilers with an unvented cylinder suit larger houses and HMOs where several outlets run at once. We measure the mains flow rate rather than guessing.

Yes, boiler installation is notifiable work — but you do not need to arrange it. Our Gas Safe registration allows us to self-certify, and the compliance certificate is issued to you and lodged with your local authority automatically.

Always. A full system clean, inhibitor dosing to BS 7593 and a magnetic filter are included as standard. Fitting a new boiler to a dirty system is the fastest way to destroy the heat exchanger, and most manufacturers make warranty cover conditional on it.

It depends on the appliance, but seven to twelve years is common. The conditions are enforced: registration within the manufacturer's window, correct system treatment at installation, and documented annual servicing. We register the warranty for you and issue the paperwork you will need later.

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Book your Boiler Installation today

Fill in the form and we'll confirm your appointment and an all-inclusive price, usually within the hour. Prefer to talk? Call us and we'll book you in within two minutes.

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07426 409342

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