20 Back Street, Harpley, King's Lynn, PE31 6TU
About 20 Back Street
20 Back Street is a semi-detached house in King's Lynn (PE31 6TU). It has a recorded floor area of 117 m² (around 1259 sq ft), construction records dating it to before 1900 and council tax band C. The latest certificate (November 2019) shows an E (score 53), well below the UK norm with real room to improve. Earlier certificates rated it D (January 2009); the latest reading is one band lower. Between certificates, wall efficiency went from Very Poor to Good and roof efficiency went from Average to Good; while hot-water efficiency dropped from Good to Average and lighting dropped from Very Good to Good. The recommended improvements would lift it to C (score 75), a 2-band jump. Main heating runs on oil.
Energy performance
20 Back Street's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Certificate validity
Valid until 7 November 2029
Property Improvements
Changes detected from historical EPC data
Hot water efficiency decreased
Wall insulation improved
Roof insulation improved
Low energy lighting percentage decreased
Get a survey for this property
Level 3 Building Survey
Because the property was built before 1919, has been extended more than once, and has no mains gas supply, we believe a Level 3 building survey should be considered.
From £955 · Includes VAT
Planning history
20 Back Street has no planning applications on record.
But the area is active
3 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
20 Back Street has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£317,000
Modelled from EPC, postcode comparables.
No sales recorded with HM Land Registry
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
Median price across the last 5 sales in PE31 6TU: £255,000 (2026–2019).
Nearby sales in PE31 6TU
Rhubarb Cottage, Back Street, Harpley, King's Lynn, PE31 6TU
Sold Apr 2026
£255,00010 Back Street, Harpley, King's Lynn, PE31 6TU
Sold Jul 2025
£420,00023 Back Street, Harpley, King's Lynn, PE31 6TU
Sold May 2022
£266,30029 Back Street, Harpley, King's Lynn, PE31 6TU
Sold Mar 2019
£246,50030 Back Street, Harpley, King's Lynn, PE31 6TU
Sold Sept 2016
£168,000
Versus other Back Street homes
EPC Rating
53 (E)
Street avg 47 (E)
Floor Area
117 m²
Street avg 136 m²
CO₂ Emissions
7.0 t/year
Street avg 8.1 t/year
Habitable Rooms
6 rooms
Street avg 6 rooms
Similar properties nearby
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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
50/mo
Falling year-on-year across the wider district.
Closest school
0.9 km
Harpley CofE VC Primary School. 1 school 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
45.1dB

Night-time· 23:00 – 07:00
37.0dB







