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Get startedFlat 4, 11 Lowndes Square, London, SW1X 9HB
4 sales on record
About Flat 4
A plain-English summary derived from public records, EPC certificates, sold prices and local data.
Flat 4 is a detached house in London (SW1X 9HB). It has a recorded floor area of 126 m² (around 1356 sq ft) and construction records dating it to before 1900. The latest certificate (June 2025) shows a C (score 72). When first surveyed in November 2009 the rating was E, the property has climbed 2 bands since. Between certificates, wall efficiency went from Very Poor to Poor, roof efficiency went from Very Poor to Average and window efficiency went from Very Poor to Poor; while hot-water efficiency dropped from Good to Average and lighting dropped from Very Good to Good. The recommended improvements would push it to B (score 81).
It hasn't traded since April 2011, a hold of 15 years that's notably long for the area. Across the public record there are 4 sales, relatively high churn for a single property. 11 planning records sit against the property, 9 approved, 0 refused, 2 pending. Past consents include an extension, meaningful when judging how the property has evolved. An active application for an extension is awaiting a decision. The record references listed-building consent, which constrain future alterations. Sale prices here have outpaced London HPI: 19.7% per year against 0% for the wider region. Today's modelled estimate of £2,529,000 is 15% above the 2011 sale price. On a £-per-square-foot basis, the last sale (£1,622/sq ft) was about 251.4% above the typical sold price in the postcode. At 126 m² it's 15.4% smaller than the typical home in the postcode (149 m² median across 19 EPCs).
Energy performance
Every EPC certificate filed against this property — current rating, recorded improvements, and where there's headroom to reach a higher band.
Current Certificate(1 of 3)
Jun 2025
EPC Rating
A
B
C
C72
D
E
F
G
Main Heating
Electric & Gas
Main Fuel
Gas
Hot Water
Average
Windows
Poor
CO2 Emissions
3.4 t/year
Occupancy
Owner Occupied
Planning history
Applications and permits filed against Flat 4, 11 Lowndes Square, London, SW1X 9HB, sourced from the PlanIt planning register.
Flat 4 has 2 separate extension applications on the council record.
- Nov 2024ExtensionFullPending
Extension: Rear of property
Alterations to first and second floors including first floor rear extension to closet wing, replacement of second floor conservatory with new solid extension with flat roof, replacement windows, and internal alterations (First Floor And Second Floor Maisonette). (Linked with 24/07799/LBC)
Sales history & valuation
Recorded transactions, our model's current estimate, and a quick read on what neighbouring properties have sold for.
Sale price has at least doubled since 2006.
Current estimate
See how we calculated this£2,529,000
Modelled from EPC, postcode comparables and a sale-price growth of 19.7% per year over 5 years.
Last sold (2011)
£2,200,000
Growth on file: 19.7% per year over 5 years.
Sales timeline
Launch offer · 33% off
The complete analysis of Flat 4, 11 Lowndes Square, London, SW1X 9HB
Everything we know about this property, compiled into one in-depth, downloadable report.
Detailed AI analysis
An AI-written breakdown of everything that matters
Versus other Lowndes Square homes
Four headline reads against 19 similar flats on this street, drawn from the latest EPC and Land Registry data.
Price per m² for Flat 4 runs comfortably ahead of the street norm.
Price per m²
£17,460
Street avg £13,481
Floor Area
126 m²
Street avg 163 m²
Habitable Rooms
4 rooms
Similar properties nearby
A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
The neighbourhood at a glance
A condensed read of the local area. Each tile links through to the full breakdown on the London district page.
Rail-style transport is unusually close for this postcode.
Crime
5/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
Sloane Street / Knightsbridge Station — bus stop.
Road noise across the postcode
Modelled day and night-time noise levels around SW1X 9HB from Defra's strategic mapping. The pin marks this postcode's centroid.
Daytime· 07:00 – 23:00
59.7dB
Everything within walking distance
Schools, transport stops and scenic spots near this property — 79 points of interest in total.
Common questions
The questions buyers, sellers and homeowners most often ask about Flat 4, 11 Lowndes Square, London, SW1X 9HB. Each answer is also embedded as structured data for search engines.
