12 Heydon Road is a four-bedroom detached house in Great Chishill, Royston, Royston (SG8 8SR). It has a recorded floor area of 154 m² (around 1658 sq ft), construction records dating it to before 1900 and council tax band G. It is a listed building, which means external alterations are tightly controlled but it may qualify for heritage tax reliefs. Other recorded features include a self-contained annexe. Period features are noted in the property record. The latest certificate (June 2025) shows an E (score 54), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since June 2025. Between certificates, hot-water efficiency went from Poor to Average and lighting went from Poor to Average; while wall efficiency dropped from Good to Very Poor and roof efficiency dropped from Good to Average. The recommended improvements would push it to D (score 60). Main heating runs on oil.
Sale prices here have outpaced England HPI: 3.6% per year against 0% for the wider region. Today's modelled estimate of £804,000 is 10.1% above the 2025 sale price. On a £-per-square-foot basis, the last sale (£440/sq ft) was about 65% above the typical sold price in the postcode. Most recent transfer was July 2025 at £730,000 — fresh data. At 154 m² it's 24.4% larger than the typical home in the postcode (124 m² median across 22 EPCs). One historical planning record sits against the property in 2017.
12 Heydon Road's carbon output runs well above what efficient homes in the postcode produce.
Repair and rebuild weathered redundant chimney stack at west end of property and increase its height. Increase height of central chimney stack and pot (in use) in line with current health and safety recommendations. The thatcher has advised that both chimneys will require this increase in height prior to rethatching scheduled for 2018.
Sale price has at least doubled since 1999.
£804,000
Modelled from EPC, postcode comparables and a sale-price growth of 3.6% per year over 26 years.
£730,000
Growth on file: 3.6% per year over 26 years.
Everything we know about this property, compiled into one in-depth, downloadable report.
Detailed analysis
A written breakdown of everything that matters
Years Held for 12 Heydon Road lags the street by a wide margin.
Price per m²
£4,740
Street avg £3,443
Floor Area
154 m²
Street avg 135 m²
Habitable Rooms
5 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.
Nearest stop
1.9 km

Daytime· 07:00 – 23:00
44.3dB

Launch offer
Secure checkout · One-off payment
30-day money-back guarantee

Changes detected from historical EPC data
Replaced storage heaters with gas boiler
Fuel source changed
Heating controls upgraded for better temperature management
Hot water system upgraded
More low energy lighting installed
Full planning data for 12 Heydon Road, Great Chishill, Royston, SG8 8SR
Every application and decision on this property and nearby, in full, in the report.
23 July 2025Most recent
£730,000
+37.7%over 18 years14 November 2006
£530,000
+78.2%over 6 years26 November 1999
£297,500
Median price across the last 5 sales in SG8 8SR: £690,000 (2024–2021).
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
Ad-free · Secure Stripe checkout · One-off payment
30-day money-back guarantee

CO₂ Emissions
8.9 t/year
Street avg 5.9 t/year
SG8 8HN
School — bus stop.
Closest school
1.9 km
Chrishall Holy Trinity and St Nicholas CofE (Aided) Primary School and Pre-School. 2 schools nearby.
Night-time· 23:00 – 07:00
37.1dB