21b is a four-bedroom semi-detached house in Steeple Morden, Royston, Royston (SG8 0LP). It has a recorded floor area of 134 m² (around 1442 sq ft), construction records dating it to 1976-1982 and council tax band E. The latest certificate (January 2023) returns a B (score 83), comfortably above the UK average. When first surveyed in May 2013 the rating was D, the property has climbed 2 bands since. Between certificates, roof efficiency went from Average to Very Good, window efficiency went from Average to Good and lighting went from Average to Very Good; while hot-water efficiency dropped from Average to Poor. Main heating runs on electricity. Other recorded features include attached land beyond the plot. Our model identifies extension potential, subject to local planning policy.
Sale prices here have outpaced England HPI: 7.5% per year against 0% for the wider region. Today's modelled estimate of £591,000 sits 73.8% above the 2014 sale of £340,000. At 134 m² it's 16.8% smaller than the typical home in the postcode (161 m² median across 8 EPCs). On energy efficiency it sits in the top 10% of properties in this postcode. Last changed hands 12 years ago, in February 2014.
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
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21b ranks among the most efficient homes in the postcode for energy use.
21b has no planning applications on record.
Notable planning nearby
1applications of note in the surrounding area
Independent checks surfaced things a buyer would want to understand before offering. The report explains each one in full, with the underlying data and what to ask.
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Sale price has grown by over 3x since 1995.
£591,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.5% per year over 19 years.
£340,000
Growth on file: 7.5% per year over 19 years.
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
On epc rating, 21b stands well clear of the street.
Price per m²
£2,537
Street avg £3,763
Floor Area
134 m²
Street avg 160 m²
Habitable Rooms
6 rooms
Street avg 7 rooms
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
3/mo
Steady year-on-year across the wider district.
Closest school
0.1 km

Daytime· 07:00 – 23:00
43.1dB

Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Changes detected from historical EPC data
Heat pump installed, significantly improving energy efficiency
Changed to a more efficient fuel source
Heating controls changed
Hot water efficiency decreased
Windows upgraded, improving insulation
Loft insulation upgraded to recommended levels
More low energy lighting installed
Solar PV panels (40 kWp) installed
5 February 2014Most recent
£340,000
+282.0%over 18 years16 June 1995
£89,000
Median price across the last 5 sales in SG8 0LP: £367,500 (2025–2018).
12 Cheyney Street Steeple Morden Royston
Sold Nov 2025
2a Cheyney Street Steeple Morden Royston
Sold Apr 2024
11 Cheyney Street Steeple Morden Royston
Sold May 2022
17 Cheyney Street Steeple Morden Royston
Sold Sept 2021
1 Cheyney Street Steeple Morden Royston
Sold Oct 2016

CO₂ Emissions
1.7 t/year
Street avg 9.1 t/year
SG8 0RB
Steeple Morden CofE VC Primary School. 2 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.
Night-time· 23:00 – 07:00
35.7dB