12 St Leonard S Square, Surbiton, KT6 4DG
About 12 St Leonard S Square
12 St Leonard S Square is an end-of-terrace house in Surbiton (KT6 4DG). It has a recorded floor area of 63 m² (around 678 sq ft), construction records dating it to before 1900 and council tax band D. The latest certificate (February 2026) shows a C (score 70). When first surveyed in December 2009 the rating was E, the property has climbed 2 bands since. Between certificates, wall efficiency went from Very Poor to Poor, window efficiency went from Poor to Good and lighting went from Poor to Good; while roof efficiency dropped from Good to Average. The recommended improvements would push it to B (score 82). This certificate was lodged in the last six months, so the rating reflects current condition.
It hasn't traded since June 1999, a hold of 27 years that's notably long for the area. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £529,000 sits 265% above the 1999 sale of £144,950. On a £-per-square-foot basis, the last sale (£214/sq ft) was about 59.2% below the postcode norm. 4 planning records sit against the property, 4 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved. Its energy rating outperforms most of the postcode (better than 78% of similar EPCs).
Know exactly what you're buying at 12 St Leonard S Square
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
The EPC has just been inspected, so the rating reflects current condition.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
High performance glazing installed
Wall insulation improved
More low energy lighting installed
Planning history
12 St Leonard S Square has 2 separate extension applications on the council record.
- Apr 2017OutbuildingFullIn report
Erection of a timber flat roof shed to be positioned to side of property
- Council
- Surbiton
- Documents
- 8 docs on file
- Reference
- 17/16095
- Apr 2017OutbuildingFullIn report
Erection of a timber flat roof shed to be positioned to side of property
- Documents
- 8 docs on file
- Reference
- 17/16095/HOU
We flagged 1 thing worth checking at 12 St Leonard S Square
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
12 St Leonard S Square's estimated value is more than triple its earliest registered sale price (1999).
£529,000
Modelled from EPC, postcode comparables.
£144,950
Recorded with HM Land Registry.
Sales timeline
3 June 1999Most recent
£144,950
Median price across the last 5 sales in KT6 4DG: £580,000 (2025–2021).
Nearby sales in KT6 4DG
10 St Leonard S Square, Surbiton, KT6 4DG
Sold Nov 2025
£588,0004 St Leonard S Square, Surbiton, KT6 4DG
Sold Mar 2024
£540,0005 St Leonard S Square, Surbiton, KT6 4DG
Sold Aug 2022
£580,0006 St Leonard S Square, Surbiton, KT6 4DG
Sold Jun 2021
£590,0009 St Leonard S Square, Surbiton, KT6 4DG
Sold Oct 2020
£525,000
Everything we know about 12 St Leonard S Square, 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 St Leonard S Square homes
On price per m², 12 St Leonard S Square runs well behind the street norm.
Price per m²
£2,301
Street avg £8,280
Floor Area
63 m²
Street avg 60 m²
Habitable Rooms
4 rooms
Street avg 3 rooms
CO₂ Emissions
2.0 t/year
Street avg 2.6 t/year
Similar properties nearby
1 Egham Court, Grove Road
KT6 4DW
1 Falconhurst, The Crescent
KT6 4BP
1 Ardmay Gardens
KT6 4SW
1 Crescent Court, The Crescent
KT6 4BW
1 Maple Road
KT6 4AA
1 Hill Court, St Mark S Hill
KT6 4LW
1 Ashleigh Court, Catherine Road
KT6 4HF
1 Embassy Court, Portsmouth Road
KT6 4HW
The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
9/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
St Leonard's Road — bus stop.
Closest school
0.2 km
St Andrew's and St Mark's CofE Junior School. 35 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
53.4dB

Night-time· 23:00 – 07:00
44.9dB