4a, South Hills, Brill, Aylesbury, HP18 9TQ
About 4a
4a is a semi-detached house in Brill, Aylesbury, Aylesbury (HP18 9TQ). It has a recorded floor area of 136 m² (around 1464 sq ft) and construction records dating it to before 1900. The latest certificate (July 2017) shows a C (score 69), just inside the C band. When first surveyed in September 2016 the rating was D, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Good and main heating went from Poor to Good; while roof efficiency dropped from Very Good to Good and hot-water efficiency dropped from Poor to Very Poor. The recommended improvements would push it to B (score 81). Main heating runs on electricity.
Its energy rating outperforms most of the postcode (better than 82% of similar EPCs). Across 2016–2018, sale prices on this property compounded at 1126.8% per year. Today's modelled estimate of £1,052,000 is 15% above the 2018 sale price. On a £-per-square-foot basis, the last sale (£625/sq ft) was about 77.4% above the typical sold price in the postcode. Most recent transfer: August 2018 at £915,000.
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Hot water efficiency decreased
Wall insulation improved
Get a survey for this property
Level 3 Building Survey
Because the property was built before 1919, has no mains gas supply, and has solid (non-cavity) walls, we believe a Level 3 building survey should be considered.
From £1,645 · Includes VAT
Planning history
4a has no planning applications on record.
But the area is active
2 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
4a has more than quadrupled in price since its earliest registered sale in 2016.
£1,052,000
Modelled from EPC, postcode comparables and a sale-price growth of 1126.8% per year over 2 years.
£915,000
Growth on file: 1126.8% per year over 2 years.
Sales timeline
9 August 2018Most recent
£915,000
+9050.0%over 1 year20 October 2016
£10,000
Median price across the last 5 sales in HP18 9TQ: £785,000 (2025–2018).
Nearby sales in HP18 9TQ
23 South Hills, Brill, Aylesbury, HP18 9TQ
Sold Aug 2025
£295,10021 South Hills, Brill, Aylesbury, HP18 9TQ
Sold Apr 2024
£1,800,0005 South Hills, Brill, Aylesbury, HP18 9TQ
Sold May 2022
£785,0004 South Hills, Brill, Aylesbury, HP18 9TQ
Sold Aug 2020
£526,50015 South Hills, Brill, Aylesbury, HP18 9TQ
Sold Jul 2018
£990,000
Versus other South Hills homes
4a outperforms the street on price per m² by a wide margin.
Price per m²
£6,728
Street avg £4,664
Floor Area
136 m²
Street avg 155 m²
Habitable Rooms
4 rooms
Street avg 6 rooms
CO₂ Emissions
3.6 t/year
Street avg 7.4 t/year
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The neighbourhood at a glance
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
0.3 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.
Road noise across the postcode

Daytime· 07:00 – 23:00
45.0dB

Night-time· 23:00 – 07:00
36.2dB







