15a is a semi-detached house in Byram, Knottingley, Knottingley (WF11 9DX). It has a recorded floor area of 68 m² (around 732 sq ft), construction records dating it to 1950-1966 and council tax band A. At 68 m² this is the 3rd smallest of 30 units on EPC record in the building, where floor areas span 68–123 m². The building's EPC ratings span F to C, with this unit at the top. The latest certificate (November 2020) shows a C (score 74). When first surveyed in March 2010 the rating was F, the property has climbed 3 bands since. Between certificates, wall efficiency went from Poor to Average, hot-water efficiency went from Very Poor to Good and main heating went from Poor to Good; while lighting dropped from Good to Average.
Sale prices here have outpaced England HPI: 1.6% per year against 0% for the wider region. Today's modelled estimate of £111,000 sits 58.6% above the 2019 sale of £70,000. On a £-per-square-foot basis, the last sale (£96/sq ft) was about 29.7% below the postcode norm. Most recent transfer: October 2019 at £70,000.
No planning applications are recorded against 15a, East Acres, Byram, Knottingley, WF11 9DX. The full report also covers planning activity across the surrounding area.
Full planning data for 15a, East Acres, Byram, Knottingley, WF11 9DX
Every application and decision on this property and nearby, in full, in the report.
£111,000
Modelled from EPC, postcode comparables and a sale-price growth of 1.6% per year over 12 years.
£70,000
Growth on file: 1.6% per year over 12 years.
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On floor area, 15a runs well behind the street norm.
EPC Rating
74 (C)
Street avg 72 (C)
Floor Area
68 m²
Street avg 69 m²
CO₂ Emissions
2.1 t/year
Street avg 2.7 t/year
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km

Daytime· 07:00 – 23:00
47.8dB

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Changes detected from historical EPC data
Replaced storage heaters with gas boiler
Connected to mains gas supply
Hot water system upgraded
Cavity wall insulation installed
Low energy lighting percentage decreased
25 October 2019Most recent
£70,000
+21.7%over 12 years30 April 2007
£57,500
Median price across the last 5 sales in WF11 9DX: £145,000 (2025–2022).
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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Habitable Rooms
3 rooms
Street avg 3 rooms
WF11 9LL
East Acres — bus stop.
Closest school
0.7 km
Brotherton and Byram Community Primary Academy. 8 schools nearby.
Night-time· 23:00 – 07:00
39.3dB