Energy Performance Certificate
BLACKTHORN, WARRENS FARM
CM21 0LR
ALLENS GREEN
Current
B
84
Potential
B
86
At a Glance
About This Property
This detached house is located in ALLENS GREEN, CM21 0LR. The property offers 479m² (5156 sq ft) of generously-sized living space. With an EPC rating of B (84/100), this property is highly energy efficient, placing it in the top tier of UK homes. This property benefits from a ground source heat pump system, which can deliver 3-4 units of heat for every unit of electricity used. Heat pumps are eligible for the £7,500 Boiler Upgrade Scheme grant, making them increasingly popular for UK homes seeking to reduce carbon emissions. Estimated annual energy costs are £1817, comprising £1569 for heating, £94 for hot water, and £154 for lighting. The property produces 7.6 tonnes of CO2 per year, which is above average for a UK home.
How Does BLACKTHORN Compare?
With an energy efficiency score of 84/100, this ALLENS GREEN property is excellent, ranking in the top 15% nationally. Annual energy costs of £1817 are close to the UK average. At 479m², this property is significantly larger than the average UK home (87m²). CO2 emissions of 7.6 tonnes/year are above average. Energy improvements could significantly reduce the property's carbon footprint.
Data source: Comparisons based on UK national statistics from the Department for Energy Security and Net Zero.This property is located in the CM21 postcode district.
How This Property Compares
vs UK Average
vs ALLENS GREEN
vs CM21
National Ranking: With an EPC score of 84/100, this property is excellent and performs better than approximately 85% of UK homes for energy efficiency.
Top 15% nationally
Energy Costs: £967/year more than the ALLENS GREEN average
Energy Efficiency Rating
📊 Official EPC Register DataCurrent Rating
Potential Rating
Based on assessment dated 30 Sept 2020
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Property Information
Full Address
BLACKTHORN
WARRENS FARM
SLOUGH ROAD
CM21 0LR
ALLENS GREEN
Property Type
House
Detached
Floor Area
479.0 m²
NaN total rooms
NaN heated
Tenure
Not defined - use in the case of a new dwelling for which the intended tenure in not known. It is not to be used for an existing dwelling
Efficiency Score
84 / 100
Potential: 86
CO₂ Emissions
7.6 tonnes/year
16 kg/m²
Energy Consumption
94 kWh/m²/year
Last Inspected
30 Sept 2020
new dwelling
About ALLENS GREEN
ALLENS GREEN is situated in Essex, East of England. Properties in ALLENS GREEN have an average EPC rating of D (score 60/100). This property performs better than most homes in the area. Heating costs are £719 above the local average, suggesting room for improvement. The CM21 postcode district contains over 3900 registered properties.
Location & Nearby Area
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Annual Energy Costs
Heating
Ground source heat pump, underfloor, electric
£1569.0/yr
Hot Water
£94.0/yr
Lighting
100.0% low energy
£154.0/yr
Building Elements
Walls
Average thermal transmittance 0.28 W/m-¦K
Roof
Average thermal transmittance 0.18 W/m-¦K
Windows
High performance glazing
Floor
Average thermal transmittance 0.16 W/m-¦K
Heating System
Ground source heat pump, underfloor, electric
Main Fuel
Electricity: electricity, unspecified tariff
Lighting
Low energy lighting in all fixed outlets
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📊 Compare with UK-Wide Property Data
See how this property compares to national averages. Explore energy efficiency trends, top-rated areas, and comprehensive UK property statistics.
View UK Property Insights →Nearby Schools
Within 3 miles of this property
Mandeville Primary School
PrimaryLast inspected: Feb 2023
High Wych Church of England Primary School
PrimaryLast inspected: Mar 2018
Leventhorpe
SecondaryLast inspected: Jan 2012
Spellbrook CofE Primary School
PrimaryLast inspected: Nov 2021
Reedings Junior School
PrimaryLast inspected: May 2018
Fawbert and Barnard Infants' School
PrimaryLast inspected: Apr 2009
St Andrew's CE Primary School and Nursery
PrimaryLast inspected: Jul 2023
Widford School
PrimaryLast inspected: Jun 2019
About school ratings: Ofsted ratings range from Outstanding to Inadequate. These ratings are based on inspections of teaching quality, leadership, pupil behavior, and safety. Note that school catchment areas vary - check with the school or local council for admission details.
Data source: School information from Get Information About Schools (GIAS). Distances are approximate. Always verify school catchment areas directly with the school or local education authority.
Broadband & Connectivity
Average download speed: 128 Mbps
Download Speed
Upload Speed
Available Providers
What do these speeds mean? 10-30 Mbps: Good for browsing and streaming. 30-100 Mbps: Great for multiple users and HD streaming. 100-300 Mbps: Excellent for 4K streaming and gaming. 300+ Mbps: Perfect for large households and heavy internet use.
Data source: Broadband speeds are from Ofcom Connected Nations 2025 report (July 2025 release). Data shows typical speeds available in this postcode area. Actual speeds at this specific property may vary depending on line quality, distance from exchange, and chosen provider. Always verify availability with providers before committing.
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Area Safety
The surrounding area (1-mile radius) experiences very low crime levels
Most Common Incidents
April 2026Burglary
2 incidents (33%)
Anti-social behaviour
1 incidents (17%)
Theft
1 incidents (17%)
Public order
1 incidents (17%)
Vehicle crime
1 incidents (17%)
About this data: Crime statistics show incidents reported during April 2026 within a 1-mile radius. Data from Police.uk, updated monthly.
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Showing properties in the same postcode. Click to view detailed EPC data for each property.
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All properties in CM21 • Click to view detailed energy performance data
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About this EPC: Energy Performance Certificates are valid for 10 years and are required when a property is built, sold, or rented. Learn more about EPCs or book an EPC assessment.
Cost estimates are approximate and actual savings may vary. Find local tradesmen to get accurate quotes for improvements.
Data Sources: This report contains public sector information licensed under the Open Government Licence v3.0.
Data from: UK Energy Performance Certificate Register, HM Land Registry Price Paid Data, and Police.uk crime statistics.