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Get started39 Thornden is a four-bedroom detached house in Cowfold, Horsham, Horsham (RH13 8AG). It has a recorded floor area of 230 m² (around 2476 sq ft), construction records dating it to 1967-1975 and council tax band F. The latest certificate (August 2025) shows a D (score 58), a step below the typical UK home. When first surveyed in October 2017 the rating was E, the property has climbed 1 band since. Between certificates, roof efficiency went from Very Poor to Good; while lighting dropped from Very Good to Good. Main heating runs on oil.
Sale prices here have outpaced Horsham HPI: 6.3% per year against 0% for the wider region. Today's modelled estimate of £825,000 is 44.7% above the 2018 sale price. On a £-per-square-foot basis, the last sale (£230/sq ft) was about 36.5% below the postcode norm. At 230 m² the property is well over the postcode median (109 m² across 12 EPCs), placing it in the larger end of the local stock. Most recent transfer: July 2018 at £570,000. One historical planning record sits against the property in 2009.
39 Thornden's carbon output runs well above what efficient homes in the postcode produce.
Replacement of 3 dormer windows with 1 and demolition of 1 garage
Price for 39 Thornden has grown more than fourfold since the 1995 starting point.
£825,000
Modelled from EPC, postcode comparables and a sale-price growth of 6.3% per year over 23 years.
£570,000
Growth on file: 6.3% per year over 23 years.
On price per m², 39 Thornden runs well behind the street norm.
Price per m²
£2,478
Street avg £5,789
Floor Area
230 m²
Street avg 116 m²
Habitable Rooms
6 rooms
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.4 km

Daytime· 07:00 – 23:00
49.6dB

Changes detected from historical EPC data
Roof insulation improved
More low energy lighting installed
Are we missing something? Tell us about home improvements to help adjust your valuation.
19 July 2018Most recent
£570,000
+36.4%over 10 years12 October 2007
£418,000
+207.4%over 12 years21 February 1995
£136,000
Median price across the last 5 sales in RH13 8AG: £560,000 (2025–2021).
Street avg 5 rooms
CO₂ Emissions
9.3 t/year
Street avg 6.2 t/year
RH13 8PH
Brook Farm — bus stop.
Closest school
0.3 km
St Peter's CofE (Aided) Primary School. 1 school nearby.
Night-time· 23:00 – 07:00
43.4dB
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