Model valuation£417,0008 Busby Close
Local market context
21 South Hills is a detached house in Brill, Aylesbury, Aylesbury (HP18 9TQ). It has a recorded floor area of 124 m² (around 1335 sq ft), construction records dating it to before 1900 and council tax band G. The latest certificate (November 2025) shows a C (score 79), near the top of the C band. When first surveyed in September 2010 the rating was E, the property has climbed 2 bands since. Between certificates, wall efficiency went from Very Poor to Very Good, roof efficiency went from Poor to Very Good and window efficiency went from Poor to Very Good. The recommended improvements would push it to B (score 88). Main heating runs on electricity: electricity, unspecified tariff.
3 planning records sit against the property, 2 approved, 1 refused. Past consents include partial demolition and new windows, meaningful when judging how the property has evolved. At 124 m² it's 20.5% smaller than the typical home in the postcode (156 m² median across 11 EPCs). Its energy rating outperforms most of the postcode (better than 82% of similar EPCs). On a £-per-square-foot basis, the last sale (£1,349/sq ft) was about 336.1% above the typical sold price in the postcode. Last sale on file: £1,800,000 in April 2024.
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21 South Hills's carbon output is low for the local stock.
Certificate validity
Valid until 27 November 2035
Changes detected from historical EPC data
Hot water efficiency decreased
Window efficiency improved
Wall insulation improved
Floor insulation added or improved
More low energy lighting installed
Heat pump installed, significantly improving energy efficiency
Changed to a more efficient fuel source
Heating controls upgraded for better temperature management
Hot water efficiency improved
High performance glazing installed
Cavity wall insulation installed
Roof insulation improved
More low energy lighting installed
Get a survey for this property
Because the property was built before 1919, we believe a Level 3 building survey should be considered.
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A recent planning application at 21 South Hills was refused — worth checking the council file.
3 applications on record at 21 South Hills, Brill, Aylesbury, HP18 9TQ
Installation of new bay window
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Latest sale on 21 South Hills was the highest on Land Registry record across the postcode.
£1,765,000
Modelled from EPC, postcode comparables.
£1,800,000
Recorded with HM Land Registry.
9 April 2024Most recent
£1,800,000
Median price across the last 5 sales in HP18 9TQ: £785,000 (2025–2018).
23 South Hills, Brill, Aylesbury, HP18 9TQ
Sold Aug 2025
5 South Hills, Brill, Aylesbury, HP18 9TQ
Sold May 2022
4 South Hills, Brill, Aylesbury, HP18 9TQ
Sold Aug 2020
4a, South Hills, Brill, Aylesbury, HP18 9TQ
Sold Aug 2018
15 South Hills, Brill, Aylesbury, HP18 9TQ
Sold Jul 2018
21 South Hills outperforms the street on price per m² by a wide margin.
Price per m²
£14,516
Street avg £3,552
Floor Area
124 m²
Street avg 157 m²
CO₂ Emissions
0.5 t/year
Street avg 7.7 t/year
Years Held
2 years
Street avg 10 years
Property research, connected
Explore sale histories, valuations, energy ratings and local areas. Ask the assistant to connect the details and take your research further.
Start your researchHP18 9DE
HP18 9HZ
HP18 9BY
HP18 9LJ
HP18 9GG
HP18 9GD
HP18 9AJ
HP18 9HU
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
77/mo
Steady year-on-year across the wider district.
Nearest stop
0.3 km
The Square — bus stop.
Closest school
0.6 km
Brill Church of England School. 2 schools nearby.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.

Daytime· 07:00 – 23:00
45.0dB

Night-time· 23:00 – 07:00
36.2dB