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Get started11 Sir Williams Close is a three-bedroom semi-detached house in Aylsham, Norwich, Norwich (NR11 6AP). It has a recorded floor area of 68 m² (around 732 sq ft), construction records dating it to 1950-1966 and council tax band C. The latest certificate (November 2020) shows an E (score 53), well below the UK norm with real room to improve. The recommended improvements would lift it to B (score 88), a 3-band jump.
2 planning records sit against the property, 1 approved, 1 refused. Past consents include an extension, meaningful when judging how the property has evolved. At 68 m² it's 26.9% smaller than the typical home in the postcode (93 m² median across 30 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 80% of similar EPCs). Today's modelled estimate of £276,000 is 22.7% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£307/sq ft) was about 67.7% above the typical sold price in the postcode. Sold March 2021 for £225,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Recommended upgrades on file would lift this property by multiple EPC bands.
11 Sir Williams Close has been extended on multiple sides of the property across separate planning applications.
Extension: Single storey · Rear of property
Single storey flat roof rear extension
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£276,000
Modelled from EPC, postcode comparables.
£225,000
Recorded with HM Land Registry.
11 Sir Williams Close is notably below the street on floor area.
Price per m²
£3,309
Street avg £2,496
Floor Area
68 m²
Street avg 95 m²
Habitable Rooms
5 rooms
Rail-style transport is unusually close for this postcode.
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.5 km
Aylsham (Bure Valley Railway) — subway entrance.

Daytime· 07:00 – 23:00
48.6dB

Extension: Single storey · Side and rear of property
Erection of Single Storey Side and Rear Extension (Prior Notification)
1 March 2021Most recent
£225,000
Median price across the last 5 sales in NR11 6AP: £275,000 (2025–2021).
Street avg 5 rooms
CO₂ Emissions
4.5 t/year
Street avg 4.6 t/year
NR11 6JD
Closest school
0.1 km
Aylsham High School. 4 schools nearby.
Night-time· 23:00 – 07:00
38.9dB
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