20 Heydon Road is a three-bedroom detached house in Great Chishill, Royston, Royston (SG8 8SR). It has a recorded floor area of 127 m² (around 1372 sq ft), construction records dating it to before 1900 and council tax band F. The latest certificate (October 2010) shows an F (score 36), near the bottom of the EPC scale. The recommended improvements would push it to E (score 48). Main heating runs on oil. The latest certificate is from October 2010, so improvements made since then won't be reflected. Period features are noted in the property record. Our model identifies extension potential, subject to local planning policy.
Untraded for 25 years, with the last transfer in August 2001. Across the public record there are 4 sales, relatively high churn for a single property. Sale prices here have outpaced England HPI: 17% per year against 0% for the wider region. Today's modelled estimate of £551,000 sits 132.5% above the 2001 sale of £237,000. On a £-per-square-foot basis, the last sale (£173/sq ft) was about 38.5% below the postcode norm. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. 5 planning records sit against the property, 3 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved.
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
Launch offer · save £5
20 Heydon Road sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
This certificate is over 10 years old and is no longer valid.Expired 13 Oct 2020
20 Heydon Road has 3 separate extension applications on the council record.
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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20 Heydon Road has more than doubled in price since the earliest registered sale in 1995.
£551,000
Modelled from EPC, postcode comparables and a sale-price growth of 17.0% per year over 6 years.
£237,000
Growth on file: 17.0% 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
Years Held for 20 Heydon Road runs comfortably ahead of the street norm.
Price per m²
£1,859
Street avg £3,635
Floor Area
127 m²
Street avg 136 m²
Habitable Rooms
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.
Nearest stop
1.9 km

Daytime· 07:00 – 23:00
44.3dB

Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Extension: Two storey
Proposed rear two storey infill extensions to existing house and smooth render finish to rear and side elevations
Extension: Two storey · Rear of property
Proposed rear two storey infill extensions to existing house and smooth render finish to rear and side elevations
24 August 2001Most recent
£237,000
+30.2%over 2 years14 June 1999
£182,000
14 March 1999
£182,000
+102.2%over 3 years29 June 1995
£90,000
Median price across the last 5 sales in SG8 8SR: £730,000 (2025–2021).

Street avg 6 rooms
CO₂ Emissions
10.0 t/year
Street avg 5.8 t/year
SG8 8SB
School — bus stop.
Closest school
1.9 km
Chrishall Holy Trinity and St Nicholas CofE (Aided) Primary School and Pre-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
37.1dB