Crossman House, Flat 1, 9 High Street, Sunninghill, Ascot, SL5 9NQ
About Crossman House
Crossman House is a detached house in Sunninghill, Ascot, Ascot (SL5 9NQ). It has a recorded floor area of 48 m² (around 517 sq ft), construction records dating it to 1983-1990 and council tax band C. At 48 m² this is the smallest unit on EPC record across Crossman House (48–68 m²). The building's EPC ratings span D to B across 5 units on file. The latest certificate (October 2025) shows a C (score 73). The rating has held steady at C across 2 certificates since March 2009. Between certificates, window efficiency dropped from Average to Poor.
8 years since the last transfer (February 2018). Across the public record there are 4 sales, relatively high churn for a single property. 4 planning records sit against the property, 2 approved, 2 refused. Past consents include change of use to residential, meaningful when judging how the property has evolved. At 48 m² it's 25% smaller than the typical home in the postcode (64 m² median across 9 EPCs). Across 1997–2018, sale prices on this property compounded at 5.9% per year. Today's modelled estimate of £259,000 is 29.5% above the 2018 sale price.
Everything you need to know about Crossman House
The true value, the hidden risks and the full sale history, in one report.
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The data behind every report
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Planning history
Council records show a subdivision application — the property's legal arrangement has been altered.
- Oct 2015RenovationFullIn report
Alterations to fenestration to facilitate habitable accommodation
- Documents
- 12 docs on file
- Reference
- 15/01990/FULL
- May 2015Change of UseOutlineIn report
Change of use of the first floor from office to 2 x 1 bed flats
- Documents
- 18 docs on file
- Reference
- 15/00859/CLASSO
We flagged 1 thing worth checking at Crossman House
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
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Sales history & valuation
Sale price has grown by over 3x since 1997.
£259,000
Modelled from EPC, postcode comparables and a sale-price growth of 5.9% per year over 21 years.
£200,000
Growth on file: 5.9% per year over 21 years.
Sales timeline
28 February 2018Most recent
£200,000
+62.7%over 2 years16 August 2015
£122,900
-23.2%over 11 years24 February 2004
£160,000
+166.9%over 6 years17 April 1997
£59,950
Median price across the last 5 sales in SL5 9NQ: £280,000 (2024–2020).
Nearby sales in SL5 9NQ
Versus other High Street homes
Crossman House is notably below the street on floor area.
Price per m²
£4,167
Street avg £3,919
Floor Area
48 m²
Street avg 65 m²
Habitable Rooms
3 rooms
Street avg 3 rooms
CO₂ Emissions
1.6 t/year
Street avg 2.6 t/year
Everything you need to know about Crossman House
The true value, the hidden risks and the full sale history, in one report.
30-day money-back guarantee
The data behind every report
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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
6/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
St Michaels School — bus stop.
Closest school
0.1 km
St Michael's CofE Primary School, Sunninghill. 6 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
47.9dB
Night-time· 23:00 – 07:00
38.7dB