Half Moon House is a detached house in Knotty Green, Beaconsfield, Beaconsfield (HP9 2TN). It has a recorded floor area of 466 m² (around 5016 sq ft) and construction records dating it to 2003-2006. The latest certificate (January 2026) returns a B (score 81), comfortably above the UK average. When first surveyed in December 2011 the rating was C, the property has climbed 1 band since. Between certificates, lighting went from Poor to Good; while window efficiency dropped from Good to Average. This certificate was lodged in the last six months, so the rating reflects current condition.
Sale prices here have outpaced England HPI: 8.9% per year against 0% for the wider region. Today's modelled estimate of £2,550,000 is 15% below the 2021 sale of £3,000,000, a rare downward gap that often correlates with deferred maintenance or unfinished works. 5 planning records sit against the property, 0 approved, 0 refused. Sold November 2021 for £3,000,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Half Moon House's carbon output runs well above what efficient homes in the postcode produce.
T1 chestnut - crown lift up to 6m, reduce back remaining by up to 1.5-2m up to 10m in height; T2 chestnut - crown lift up to 6m, reduce back remaining by up 1.5-2m up to 10m in height (TPO/1969/049)
Half Moon House has more than tripled in price since its earliest registered sale in 2006.
£2,550,000
Modelled from EPC, postcode comparables and a sale-price growth of 8.9% per year over 15 years.
£3,000,000
Growth on file: 8.9% per year over 15 years.
Everything we know about this property, compiled into one in-depth, downloadable report.
Detailed analysis
A written breakdown of everything that matters
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
0.2 km

Daytime· 07:00 – 23:00
45.5dB

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Changes detected from historical EPC data
More low energy lighting installed
Detached side garage conversion, changes to roof from hip to gable including raising the roof height, 3 side rooflights and changes to windows and doors including new window in gable end, additional changes to windows and doors on main house including 3 front juliet balconies and 2 side rooflights
Full planning data for Half Moon House, Penn Road, Knotty Green, Beaconsfield, HP9 2TN
3 more on this property, plus every nearby application and full decision details, in the report.
23 November 2021Most recent
£3,000,000
+275.0%over 15 years31 May 2006
£800,000
Median price across the last 5 sales in HP9 2TN: £545,000 (2020–1997).
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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HP9 2LX
The Red Lion PH — bus stop.
Closest school
2.0 km
St Mary and All Saints CofE Primary School. 6 schools nearby.
Night-time· 23:00 – 07:00
38.3dB