18 Alder Copse, Horsham, RH12 1LD
About 18 Alder Copse
18 Alder Copse is a three-bedroom semi-detached house in Horsham (RH12 1LD). It has a recorded floor area of 82 m² (around 883 sq ft), construction records dating it to 1950-1966 and council tax band C. The latest certificate (April 2021) shows a C (score 69), just inside the C band. When first surveyed in April 2011 the rating was D, the property has climbed 1 band since. Between certificates, roof efficiency went from Average to Good and lighting went from Very Poor to Very Good; while wall efficiency dropped from Good to Average. The recommended improvements would push it to B (score 85). Period features are noted in the property record.
Across 2001–2021, sale prices on this property compounded at 8.3% per year. Today's modelled estimate of £422,000 is 18.9% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£402/sq ft) was about 63.1% above the typical sold price in the postcode. Sold June 2021 for £355,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
What this property has
Inside
- Bedrooms3
- Bathrooms1
- Dining roomYes
- StudyYes
Outside
- Private gardenYes
- ParkingOff street
Building
- Heating systemGas
- Period featuresYes
- RefurbishedYes
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Roof insulation improved
More low energy lighting installed
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Planning history
18 Alder Copse has no planning applications on record.
But the area is active
1 notable application nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
18 Alder Copse has more than quadrupled in price since its earliest registered sale in 2001.
£422,000
Modelled from EPC, postcode comparables and a sale-price growth of 8.3% per year over 20 years.
£355,000
Growth on file: 8.3% per year over 20 years.
Sales timeline
23 June 2021Most recent
£355,000
+56.4%over 9 years16 March 2012
£227,000
+211.0%over 10 years29 July 2001
£73,000
Median price across the last 5 sales in RH12 1LD: £295,000 (2025–2015).
Versus other Alder Copse homes
On habitable rooms, 18 Alder Copse stands well clear of the street.
Price per m²
£4,329
Street avg £3,317
Floor Area
82 m²
Street avg 77 m²
Habitable Rooms
5 rooms
Street avg 4 rooms
CO₂ Emissions
3.0 t/year
Street avg 3.4 t/year
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The neighbourhood at a glance
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.3 km
Tower Close — bus stop.
Closest school
0.7 km
Arunside School, Horsham. 11 schools nearby.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode

Daytime· 07:00 – 23:00
49.0dB

Night-time· 23:00 – 07:00
39.0dB







