18 Barnhill Close, Marlow, SL7 3HA
About 18 Barnhill Close
18 Barnhill Close is a semi-detached house in Marlow (SL7 3HA). It has a recorded floor area of 144 m² (around 1550 sq ft), construction records dating it to 1967-1975 and council tax band E. The latest certificate (April 2022) shows a C (score 77), near the top of the C band. When first surveyed in August 2014 the rating was D, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Good, roof efficiency went from Poor to Very Good and window efficiency went from Average to Good. The recommended improvements would push it to B (score 85).
At 144 m² the property is well over the postcode median (102 m² across 12 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the top 10% of properties in this postcode. One planning record on file: an extension approved in 2017. Past consents include an extension, meaningful when judging how the property has evolved. Across 2002–2022, sale prices on this property compounded at 7.5% per year. On a £-per-square-foot basis, the last sale (£610/sq ft) was about 50.5% above the typical sold price in the postcode. Most recent transfer: August 2022 at £945,500. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Know exactly what you're buying at 18 Barnhill Close
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Energy performance
18 Barnhill Close ranks among the most efficient homes in the postcode for energy use.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Window efficiency improved
Wall insulation improved
Loft insulation upgraded to recommended levels
More low energy lighting installed
Planning history
Council records include a part-single-part-two-storey extension at 18 Barnhill Close.
- Apr 2017ExtensionFullIn report
Extension: Part single, part two storey
Householder application for construction of part single, part two storey front, side and rear extensions
- Documents
- 7 docs on file
- Reference
- 17/05552/FUL
We flagged 1 thing worth checking at 18 Barnhill Close
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.
- Larger development activity nearby
30-day money-back guarantee
Sales history & valuation
Latest sale on 18 Barnhill Close was the highest on Land Registry record across the postcode.
£898,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.5% per year over 20 years.
£945,500
Growth on file: 7.5% per year over 20 years.
Sales timeline
21 August 2022Most recent
£945,500
+119.9%over 7 years24 March 2015
£430,000
+94.6%over 12 years11 July 2002
£221,000
Median price across the last 5 sales in SL7 3HA: £630,000 (2023–2017).
Everything we know about 18 Barnhill Close, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
- Larger development activity nearby

Versus other Barnhill Close homes
On epc rating, 18 Barnhill Close stands well clear of the street.
Price per m²
£6,566
Street avg £5,334
Floor Area
144 m²
Street avg 106 m²
Habitable Rooms
6 rooms
Street avg 6 rooms
CO₂ Emissions
3.4 t/year
Street avg 6.0 t/year
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The neighbourhood at a glance
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
Sunnybank — bus stop.
Closest school
0.3 km
Marlow Church of England Infant School. 10 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode

Daytime· 07:00 – 23:00
47.8dB

Night-time· 23:00 – 07:00
39.0dB