77a is a four-bedroom detached house in Barkway, Royston, Royston (SG8 8ED). It has a recorded floor area of 138 m² (around 1485 sq ft), construction records dating it to 1976-1982 and council tax band F. Tenure is freehold. The latest certificate (June 2017) shows a D (score 67), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since February 2015. Between certificates, lighting went from Good to Very Good; while roof efficiency dropped from Very Good to Average. The recommended improvements would lift it to A (score 97), a 3-band jump.
Sale prices here have outpaced England HPI: 5.1% per year against 0% for the wider region. Today's modelled estimate of £664,000 is 16.5% above the 2019 sale price. On a £-per-square-foot basis, the last sale (£384/sq ft) was about 45.1% above the typical sold price in the postcode. At 138 m² the property is well over the postcode median (102 m² across 12 EPCs), placing it in the larger end of the local stock. Sold November 2019 for £570,000. One historical planning record sits against the property in 2021.
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
Recommended upgrades on file would lift this property by multiple EPC bands.
Replace existing front, side and rear elevation windows with uPVC double glazing, and replace existing rear elevation French doors with aluminium bi-fold doors
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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77a valuation sits well clear of the typical sold price in this postcode.
£664,000
Modelled from EPC, postcode comparables and a sale-price growth of 5.1% per year over 5 years.
£570,000
Growth on file: 5.1% per year over 5 years.
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
On habitable rooms, 77a stands well clear of the street.
Price per m²
£4,130
Street avg £3,628
Floor Area
138 m²
Street avg 134 m²
Habitable Rooms
8 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
0.1 km

Daytime· 07:00 – 23:00
43.2dB

Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Changes detected from historical EPC data
More low energy lighting installed
29 November 2019Most recent
£570,000
+25.3%over 4 years13 May 2015
£455,000
Median price across the last 5 sales in SG8 8ED: £445,000 (2025–2021).

CO₂ Emissions
4.7 t/year
Street avg 6.2 t/year
SG8 8SB
Townsend Close — bus stop.
Closest school
0.3 km
Barkway VA Church of England First 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
36.7dB