21 Church Street is a three-bedroom detached house in Guilden Morden, Royston, Royston (SG8 0JD). It has a recorded floor area of 103 m² (around 1109 sq ft) and construction records dating it to 1900-1929. The latest certificate (February 2019) shows an E (score 44), well below the UK norm with real room to improve. When first surveyed in March 2009 the rating was F, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Poor and lighting went from Very Poor to Very Good. The recommended improvements would lift it to B (score 85), a 3-band jump. Main heating runs on oil.
Untraded for 22 years, with the last transfer in August 2004. Sale prices here have outpaced England HPI: 22.9% per year against 0% for the wider region. Today's modelled estimate of £514,000 sits 63.2% above the 2004 sale of £315,000.
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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21 Church Street's carbon output runs well above what efficient homes in the postcode produce.
21 Church Street 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 1999.
£514,000
Modelled from EPC, postcode comparables and a sale-price growth of 22.9% per year over 6 years.
£315,000
Growth on file: 22.9% per year over 6 years.
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
21 Church Street outperforms the street on years held by a wide margin.
Price per m²
£3,058
Street avg £4,294
Floor Area
103 m²
Street avg 134 m²
Habitable Rooms
6 rooms
Street avg 6 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
0.2 km

Daytime· 07:00 – 23:00
44.1dB

Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Changes detected from historical EPC data
Wall insulation improved
More low energy lighting installed
13 August 2004Most recent
£315,000
+215.0%over 5 years22 January 1999
£100,000
Median price across the last 5 sales in SG8 0JD: £603,000 (2025–2022).

CO₂ Emissions
7.3 t/year
Street avg 8.5 t/year
SG8 0LP
Guilden Morden CofE Primary Academy. 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
36.1dB