Osonby, Windmill Hill, Hailsham, BN27 4RT
About Osonby
Osonby is a property in Windmill Hill, Hailsham, Hailsham (BN27 4RT).
One planning record on file: an extension approved in 2008. Past consents include an extension and a loft conversion, meaningful when judging how the property has evolved. Across 2003–2023, sale prices on this property compounded at 4.4% per year. Sold July 2023 for £485,000.
Know exactly what you're buying at Osonby
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
No EPC on record
This property doesn't have an Energy Performance Certificate yet. An EPC is required to sell or let — and unlocks our automated valuation.
Planning history
- Dec 2008Loft ConversionFullIn report
Extension: Rear of property
CONVERSION OF LOFT SPACE TO ACHIEVE AN ADDITIONAL BEDROOM. CREATION OF EN-SUITE BATHROOM/CLOAKROOM IN EXISTING BATHROOM. ENLARGE KITCHEN AND ADD EXTENSION TO REAR
Extension- Documents
- 14 docs on file
- Reference
- WD/2008/2571/F
We flagged 1 thing worth checking at Osonby
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
Osonby has more than doubled in price since the earliest registered sale in 2003.
£485,000
Growth on file: 4.4% per year over 21 years.
Sales timeline
31 July 2023Most recent
£485,000
+94.0%over 15 years20 November 2007
£249,950
+25.0%over 4 years17 January 2003
£200,000
Median price across the last 5 sales in BN27 4RT: £325,000 (2025–2017).
Nearby sales in BN27 4RT
1 Elm Cottages, Windmill Hill, Hailsham, BN27 4RT
Sold Apr 2025
£295,0004 Elm Cottages, Windmill Hill, Hailsham, BN27 4RT
Sold Dec 2022
£325,000Highbury House, Windmill Hill, Hailsham, BN27 4RT
Sold Mar 2021
£445,000Field Cottage, Windmill Hill, Hailsham, BN27 4RT
Sold Aug 2019
£320,000Post Mill House, Windmill Hill, Hailsham, BN27 4RT
Sold Mar 2017
£500,000
Everything we know about Osonby, 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

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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
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Victoria Road — bus stop.
Closest school
1.3 km
Herstmonceux Church of England Primary School. 1 school 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
45.4dB

Night-time· 23:00 – 07:00
39.0dB