12a is a detached house in Beaconsfield (HP9 2NP). It has a recorded floor area of 221 m² (around 2379 sq ft) and construction records dating it to 1967-1975. The latest certificate (April 2022) shows a C (score 71). When first surveyed in April 2009 the rating was D, the property has climbed 1 band since. Between certificates, roof efficiency went from Poor to Very Good, window efficiency went from Average to Good and lighting went from Very Poor to Good; while hot-water efficiency dropped from Very Good to Good and main heating dropped from Very Good to Good.
Sale prices here have outpaced England HPI: 6.4% per year against 0% for the wider region. Today's modelled estimate of £1,867,000 is 18.5% above the 2016 sale price. On a £-per-square-foot basis, the last sale (£662/sq ft) was about 54.7% above the typical sold price in the postcode. On the market in October 2016 and unlisted since — roughly 10 years. 6 planning records sit against the property, 1 approved, 0 refused. At 221 m² it's 24.8% smaller than the typical home in the postcode (294 m² median across 17 EPCs).
Extension: Part single, part two storey · Rear of property
Part two-storey, part single-storey rear extension; relocation and replacement of front porch; replacement of 3 rear dormer windows with 1 dormer; replacement windows plus internal reconfiguration; single-storey front garage extension, alterations to the positioning of windows and doors on the south-west (side) elevation, and the installation of skylights.
12a has more than doubled in price since the earliest registered sale in 2004.
£1,867,000
Modelled from EPC, postcode comparables and a sale-price growth of 6.4% per year over 12 years.
£1,575,000
Growth on file: 6.4% per year over 12 years.
Everything we know about this property, compiled into one in-depth, downloadable report.
Detailed analysis
A written breakdown of everything that matters
On floor area, 12a runs well behind the street norm.
Price per m²
£7,127
Street avg £5,376
Floor Area
221 m²
Street avg 334 m²
Habitable Rooms
8 rooms
Street avg 8 rooms
Rail-style transport is unusually close for this postcode.
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Wilton Road — bus stop.

Daytime· 07:00 – 23:00
47.2dB

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Changes detected from historical EPC data
Hot water efficiency decreased
Window efficiency improved
Wall insulation upgraded
Loft insulation upgraded to recommended levels
More low energy lighting installed
Extension: Part single, part two storey · Rear of property
Part two-storey part single-storey rear extension; relocation and replacement of front porch; replacement of 3 rear dormer windows with 1 dormer, replacement windows plus internal reconfiguration.
Full planning data for 12a, Assheton Road, Beaconsfield, HP9 2NP
4 more on this property, plus every nearby application and full decision details, in the report.
20 October 2016Most recent
£1,575,000
+114.3%over 12 years1 July 2004
£735,000
Median price across the last 5 sales in HP9 2NP: £2,250,000 (2025–2022).
Detailed EPC data
Full energy ratings, history and recommendations
Full planning history
Every application and decision on record
Comparable sales data
Plus transport, crime, schools and air quality
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CO₂ Emissions
5.9 t/year
Street avg 7.1 t/year
HP9 2BT
Closest school
0.8 km
St Mary and All Saints CofE Primary School. 6 schools nearby.
Night-time· 23:00 – 07:00
38.2dB