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Get started31 Thornden is a five-bedroom detached house in Cowfold, Horsham, Horsham (RH13 8AG). It has a recorded floor area of 144 m² (around 1550 sq ft), construction records dating it to 1967-1975 and council tax band F. The latest certificate (October 2020) shows an E (score 52), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since February 2012. Between certificates, roof efficiency went from Average to Good, window efficiency went from Poor to Average and lighting went from Poor to Good. The recommended improvements would lift it to C (score 75), a 2-band jump. Main heating runs on oil. It has already been extended once and our model flags further extension potential, a sign of buyer flexibility.
Sale prices here have outpaced Horsham HPI: 5.2% per year against 0% for the wider region. Today's modelled estimate of £633,000 is 13% above the 2021 sale price. At 144 m² the property is well over the postcode median (109 m² across 12 EPCs), placing it in the larger end of the local stock. 5 bedrooms is on the larger side for this postcode, where 3 is the typical count. Sold January 2021 for £560,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
31 Thornden's carbon output runs well above what efficient homes in the postcode produce.
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£633,000
Modelled from EPC, postcode comparables and a sale-price growth of 5.2% per year over 8 years.
£560,000
Growth on file: 5.2% per year over 8 years.
On habitable rooms, 31 Thornden stands well clear of the street.
Price per m²
£3,889
Street avg £5,671
Floor Area
144 m²
Street avg 123 m²
Habitable Rooms
6 rooms
Street avg 5 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
Brook Farm — bus stop.

Daytime· 07:00 – 23:00
49.6dB

Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Windows upgraded, improving insulation
Roof insulation improved
More low energy lighting installed
Are we missing something? Tell us about home improvements to help adjust your valuation.
27 January 2021Most recent
£560,000
+51.4%over 8 years20 November 2012
£370,000
Median price across the last 5 sales in RH13 8AG: £550,000 (2025–2021).
CO₂ Emissions
7.7 t/year
Street avg 6.4 t/year
RH13 8BU
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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