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We found your home

KNOTTS COTTAGE, BURY ROAD

Detached492 m²EPC D63Mains gasPre-1900

Estimated boiler replacement

£1,900–£3,200

For a detached like yours · estimated installed cost

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Your options for this home

Boiler replacement

£1,900–£3,200

Estimated installed cost · 57–73 kW

  • Existing mains gas
  • Suitable for your home size
  • Combi or system options
See details
  • Preliminary heat requirement 57.0–73.0 kW from 492.0 m² and construction era pre_1900.
  • Existing wet central heating assumed where mains gas is present.

New central heating

£10,600–£18,200

Complete system estimate · 51–65 kW

  • Boiler / heat source
  • Radiators (~45)
  • Pipework & controls
See details
  • A complete new system priced on ~45 radiators, pipework and a boiler.
  • Radiator count is indicative from floor area and confirmed on survey.

Home air conditioning

£3,800–£5,700

Multi-split system estimate · 4–6 kW · ~3 units

  • Approx. 3 indoor units
  • Heating & cooling
  • Professional installation
See details
  • Total floor area is not the same as conditioned area; this reflects the selected room scenario.

Heating & cooling profile

Using the recorded floor area and EPC characteristics, this 492m² pre-1900 detached home has a current EPC rating of D63 and mains-gas heating. HotAndCold estimates a space-heating requirement of approximately 57.0–73.0kW. This property has moderate recorded energy efficiency, neither especially poor nor especially high. The estimated heat demand per square metre is towards the higher end.

Estimated space-heating intensity
116148 W/m²
relatively highProperty data confidence: Good

Hot&Cold snapshot

Property size
Substantially larger
Energy efficiency
Moderate
Heating intensity
Relatively high
Improvement potential
Significant
Main heating fuel
Mains gas
Cooling requirement
Medium

What stands out about this home

Relatively high modelled heating demand per m²
Possible wall-insulation opportunity
Roof insulation may influence heating demand
Detached property

Why this estimate?

We calculate estimates using your property's size, type, age, heating fuel and EPC rating, along with typical installation costs, not a professional heat-loss survey.

How we calculated this

492 m²
Floor area
+
detached
Property type
+
EPC D63
Energy rating
+
Mains gas
Current fuel
Hot&Cold property model
57–73 kW
Estimated heating requirement for this property

What we found about your home

Property type
Detached
Floor area
492 m²
Energy rating
EPC D63
Main heating fuel
Mains gas
Approx. age
Pre-1900
Location
BOLTON, Blackburn with Darwen

We use publicly available data and industry models to generate this estimate. A final survey by an installer may vary.

How this home compares locally

Based on 45420 EPC-recorded properties nearby.

Floor area
+493%
493% larger than the local median

Building

Built form
Detached
Internal area (EPC)
492 m²
Building footprint
~385 m²
Approx. dimensions
~35.4 × 18.9 m
Main building axis
NW–SE
Estimated floors
2
Nearest building
26.1 m

Footprint & dimensions derived from Overture Maps building data (ODbL). Approximate, not survey-grade.

How this home is constructed & heated

Recorded on its Energy Performance Certificate.

Walls
Sandstone, as built, no insulation (assumed)
Roof
Pitched, no insulation
Windows
Fully double glazed
Main heating
Boiler and radiators, mains gas, Boiler and radiators, mains gas
Heating controls
Programmer, room thermostat and TRVs
Hot water
From main system
Floor
Solid, no insulation (assumed)

Energy improvement potential

Current
D63
Potential
C80
+17
Significant improvement potential

Recommended improvements for this property

Measures from this home’s official Energy Performance Certificate assessment that could raise its rating and cut running costs, specific to KNOTTS COTTAGE, BURY ROAD, EDGWORTH, BOLTON, BL7 0BX.

  1. 1
    50 mm internal or external wall insulationIndicative cost: £7,500 - £11,000

    Solid wall insulation involves adding a layer of insulation to either the inside or the outside surface of the external walls, which reduces heat loss and lowers fuel bills. As it is more expensive than cavity wall insulation it is only recommended for walls without a cavity, or where for technical reasons a cavity cannot be filled. Internal insulation, known as dry-lining, is where a layer of insulation is fixed to the inside surface of external walls; this type of insulation is best applied when rooms require redecorating and can be installed by a competent DIY enthusiast. External solid wall insulation is the application of an insulant and a weather-protective finish to the outside of the wall. This may improve the look of the home, particularly where existing brickwork or rendering is poor, and will provide long-lasting weather protection. Further information can be obtained from the National Insulation Association (www.nationalinsulationassociation.org.uk).

  2. 2
    Flat roof or sloping ceiling insulationIndicative cost: £900 - £1,200

    Insulation of a flat roof or sloping ceiling will significantly reduce heat loss through the roof; this will improve levels of comfort, reduce energy use and lower fuel bills. Where the weatherproof membrane is sound and the roof construction is appropriate, suitable insulation can be placed on top of the roof membrane (inverted roof). Alternatively, where the weatherproof membrane needs to be replaced insulation can be provided under the weatherproof membrane (warm roof). Further information about roof insulation and details of local contractors can be obtained from the National Insulation Association (www.nationalinsulationassociation.org.uk).

  3. 3
    Floor insulation (solid floor)Indicative cost: £5,000 - £10,000

    Insulation of a floor will significantly reduce heat loss; this will improve levels of comfort, reduce energy use and lower fuel bills. Further information about floor insulation is available from many sources including www.energysavingtrust.org.uk/northernireland/Insulation/Floor-insulation.

  4. 4
    Wind turbineIndicative cost: £5,000 - £20,000

    A wind turbine provides electricity from wind energy. This electricity is used throughout the home in the same way as the electricity purchased from an energy supplier. The British Wind Energy Association has up-to-date information on suppliers of small-scale wind systems. Wind turbines are not suitable for all properties. The system’s effectiveness depends on local wind speeds and the presence of nearby obstructions, and a site survey should be undertaken by an accredited installer.

  5. 5
    Solar photovoltaic panels, 2.5 kWpIndicative cost: £8,000 - £10,000

    A solar PV system is one which converts light directly into electricity via panels placed on the roof with no waste and no emissions. This electricity is used throughout the home in the same way as the electricity purchased from an energy supplier. The British Photovoltaic Association has up-to-date information on local installers who are qualified electricians. It is best to obtain advice from a qualified electrician. Ask the electrician to explain the options.

Source: the property’s domestic EPC recommendations (open data). Indicative only, get a professional survey before committing to any measure.

Energy rating history

Recorded change: -4 EPC points across 2 certificates.

  1. 2014D67
  2. 2025D63
A
B
C
D
E
F
G
Current: D63Potential: C80

Common questions

How much does a replacement boiler cost for a property like this?+

For this property we estimate an installed cost of £1,900–£3,200. This is indicative and based on the property's size, type and energy characteristics, your final price depends on equipment choice and an installer survey.

What size boiler might this property need?+

Our preliminary model estimates a heat requirement of around 57–73 kW. An installer confirms exact sizing on a heat-loss assessment.

How much would air conditioning cost here?+

A multi-split installation is estimated at £3,800–£5,700, depending on how many rooms you want to cool (around 3 indoor units in a typical layout).

Are these guaranteed prices?+

No, they are indicative estimates to help you understand likely costs before speaking to an installer. Your final price depends on equipment choice, installation complexity and a survey.

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