Energy Performance Certificate
20, Adelphi Gardens
SL1 2RG
SLOUGH
Current
F
26
Potential
E
53
This F-Rated Property Costs Significantly More to Run
This Property
£1,368
estimated per year
UK Average
£1,800
per year
After Improvements
£813
potential per year
💰 Government Grants Available for This Property
🏛️ BUS Grant
£7,500
Off the cost of an air source heat pump. Available now — limited places.
Check Eligibility →🏠 ECO4 Scheme
Free
Free insulation & heating upgrades for eligible households on benefits or low income.
Check Eligibility →📉 0% VAT
Save ~20%
Zero VAT on heat pumps, insulation, and solar panels until 2027. Applies automatically.
Get Solar Quote →How to Improve This F-Rated Property
With the right upgrades, this property could reach a E rating — saving up to £555 per year. Improvements are ranked by return on investment.
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💰 Save £1,540/year
With 4 selected upgrades
Future Energy Price Simulator
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Your Savings Today
£1,540/yr
£15,400 over 10 years
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£1,540/yr
£15,400 over 10 years
Build Your Upgrade Plan
Sorted by best return on investment (quick wins first)
Loft Insulation
Your roof is rated Poor. Cheapest upgrade with fastest payback — top up to 270mm.
New A-Rated Boiler
Your heating is rated Very Poor. Compare local boiler installers.
Cavity Wall Insulation
Your walls are rated Poor. Cavity fill is quick and cost-effective.
Air Source Heat Pump
Ultra-efficient heating with £7,500 government grant. OVO: MCS certified installation.
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Why Does This Property Have a F Rating?
This semi-detached maisonette is located in SLOUGH, SL1 2RG. The property offers 55m² (592 sq ft) of modest-sized living space with 3 habitable rooms. It is a post-war property from the mid-20th century. Currently rated F (26/100) for energy efficiency, this property would benefit significantly from energy improvements. With recommended improvements, it could achieve a E rating (53/100). The walls feature cavity wall insulation for improved thermal efficiency. Double glazing is installed, though the efficiency rating suggests older units. Modern low-E double glazing can be up to 40% more efficient than units installed before 2002. Estimated annual energy costs are £1368, comprising £1236 for heating, £76 for hot water, and £56 for lighting. The property produces 4.7 tonnes of CO2 per year, which is moderate for a UK home. The property last sold in April 2016 for £220,000.
Energy Efficiency Rating
📊 Official EPC Register DataCurrent Rating
Achievable Rating
With recommended improvements
Based on assessment dated 9 May 2014
What's Causing the Poor Energy Rating?
The EPC assessor rated each element of this property. Poor and average ratings are the biggest opportunities for improvement.
🧱 Walls
Cavity wall, as built, no insulation (assumed)
🏗️ Roof
Pitched, 50 mm loft insulation
🪟 Windows
Fully double glazed
📦 Floor
(other premises below)
🔥 Heating
Warm air, Electricaire
🚿 Hot Water
NaN
💡 Lighting
44.0% low energy — Low energy lighting in 44% of fixed outlets
Property Information
Full Address
20, Adelphi Gardens
SL1 2RG
SLOUGH
Property Type
Maisonette
Semi-Detached
Construction Age
England and Wales: 1950-1966
Floor Area
55.0 m²
3.0 total rooms
CO₂ Emissions
4.7 tonnes/year
86 kg/m²
Energy Consumption
481 kWh/m²/year
F-Rated Properties in SLOUGH
SLOUGH properties with F ratings are among the least energy efficient in the area. Properties in this postcode district (SL1) that have undergone improvement works have seen significant increases in EPC ratings and corresponding reductions in energy bills.
Location & Nearby Area
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Annual Running Costs — Current vs Potential
🔥 Heating
Warm air, Electricaire
£1236 /yr
Save £535/yr with improvements
🚿 Hot Water
£76 /yr
💡 Lighting
44.0% low energy
£56 /yr
Save £20/yr with improvements
💷 Sales History
Note: EPC improvements typically add 3–5% per band to property value. Moving from F to E could add significant value.
£220,000
F
Apr 2016
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Nearby Schools
Within 3 miles of this property
Slough and Eton Church of England Business and Enterprise College
SecondaryLast inspected: Nov 2013
Grove Academy
All-throughJames Elliman Academy
PrimaryLast inspected: Nov 2018
Montem Academy
PrimaryLast inspected: Mar 2023
St Mary's Church of England Primary School
PrimaryLast inspected: Oct 2019
Herschel Grammar School
SecondaryLast inspected: Sept 2012
Eden Girls' School, Slough
SecondaryLast inspected: May 2018
St Joseph's Catholic High School
SecondaryLast inspected: May 2022
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: 500 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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More Properties in SL1 2RG
Showing properties in the same postcode. Click to view detailed EPC data for each property.
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All properties in SL1 • Click to view detailed energy performance data
About this EPC: Energy Performance Certificates are valid for 10 years and are required when a property is built, sold, or rented.
Data Sources: UK Energy Performance Certificate Register, HM Land Registry Price Paid Data, Police.uk crime statistics.
Public sector information licensed under the Open Government Licence v3.0.