17 Church Street is a three-bedroom detached house in Guilden Morden, Royston, Royston (SG8 0JD). It has a recorded floor area of 149 m² (around 1604 sq ft), construction records dating it to before 1900 and council tax band E. The latest certificate (June 2022) shows a D (score 57), a step below the typical UK home. The rating has held steady at D across 2 certificates since December 2018. Between certificates, wall efficiency went from Very Poor to Poor, roof efficiency went from Poor to Very Good and lighting went from Good to Very Good; while window efficiency dropped from Good to Average. The recommended improvements would lift it to B (score 91), a 2-band jump. Main heating runs on oil. Other recorded features include a conservatory. Period features are noted in the property record.
Sale prices here have outpaced England HPI: 7.1% per year against 0% for the wider region. Today's modelled estimate of £709,000 is 11.7% above the 2019 sale price. On a £-per-square-foot basis, the last sale (£396/sq ft) was about 55% above the typical sold price in the postcode. At 149 m² the property is well over the postcode median (111 m² across 28 EPCs), placing it in the larger end of the local stock. 4 planning records sit against the property, 1 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved. Sold July 2019 for £635,000.
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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17 Church Street's carbon output runs well above what efficient homes in the postcode produce.
T1 - Hornbeam - Crown reduction of 1.2 meters to previous reduction points with a finished height of 4 meters from ground level T2 - Sycamore - Re-pollard to previous pollard points with a finished height of 6 meters.
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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17 Church Street has more than quadrupled in price since its earliest registered sale in 1997.
£709,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.1% per year over 22 years.
£635,000
Growth on file: 7.1% per year over 22 years.
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
Habitable Rooms for 17 Church Street runs comfortably ahead of the street norm.
Price per m²
£4,262
Street avg £4,249
Floor Area
149 m²
Street avg 133 m²
Habitable Rooms
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
0.2 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
Loft insulation upgraded to recommended levels
More low energy lighting installed
SG1 Vine Remove T1 Cotoneaster Remove T2 Hornbeam (Common) Remove T3 Sycamore Remove The tree works are proposed to stop the influence of the tree(s) on the soil below building foundation level and provide long term stability.
2 July 2019Most recent
£635,000
+353.6%over 22 years12 June 1997
£140,000
Median price across the last 5 sales in SG8 0JD: £603,000 (2025–2022).

Street avg 5 rooms
CO₂ Emissions
8.1 t/year
Street avg 8.5 t/year
SG8 0NZ
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