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Get started12a, Lyall Mews, Westminster, London, SW1X 8DJ
3 planning records
About 12a
A plain-English summary derived from public records, EPC certificates, sold prices and local data.
12a is a two-bedroom end-of-terrace house in Westminster, London, London (SW1X 8DJ). It has a recorded floor area of 104 m² (around 1119 sq ft), construction records dating it to before 1900 and council tax band H. The latest certificate (August 2025) shows a D (score 64), on the cusp of jumping into the C band. Earlier certificates rated it C (April 2009); the latest reading is one band lower. Between certificates, lighting went from Very Poor to Good; while wall efficiency dropped from Good to Poor and roof efficiency dropped from Average to Very Poor. The recommended improvements would push it to C (score 77).
Sale prices here have outpaced London HPI: 187.4% per year against 0% for the wider region. Today's modelled estimate of £2,168,000 is 35.5% above the 2011 sale price. At 104 m² it sits well below the postcode median (191 m² across 12 EPCs), making it one of the more compact homes locally. 3 planning records sit against the property, 3 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved. Last sold in July 2011, so it's been off the market for around 15 years.
What this property has
Pulled from EPC certificates, claim submissions and our property model. Empty categories are hidden — we only show what's known.
Inside
- Bedrooms2
- Bathrooms3
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)
Aug 2025
EPC Rating
A
B
C
D
D64
E
F
G
Main Heating
Gas
Main Fuel
Gas
Hot Water
Good
Windows
Average
CO2 Emissions
3.7 t/year
Occupancy
Owner Occupied
Planning history
Applications and permits filed against 12a, Lyall Mews, Westminster, London, SW1X 8DJ, sourced from the PlanIt planning register.
12a has an approved extension on the planning record.
- Oct 2010ConditionsGranted
Details and materials of handrail and screen pursuant to Condition 5 of planning permission dated 9 August 2010 (RN: 10/04538).
Sales history & valuation
Recorded transactions, our model's current estimate, and a quick read on what neighbouring properties have sold for.
12a has more than doubled in price since the earliest registered sale in 2011.
Current estimate
See how we calculated this£2,168,000
Modelled from EPC, postcode comparables and a sale-price growth of 187.4% per year over 1 year.
Last sold (2011)
£1,600,000
Growth on file: 187.4% per year over 1 year.
Sales timeline
Launch offer · 33% off
The complete analysis of 12a, Lyall Mews, Westminster, London, SW1X 8DJ
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 Lyall Mews homes
Four headline reads against 12 similar houses on this street, drawn from the latest EPC and Land Registry data.
12a is notably below the street on floor area.
Price per m²
£5,354
Street avg £25,069
Floor Area
104 m²
Street avg 199 m²
Habitable Rooms
4 rooms
Street avg 7 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
0.2 km
Eaton Square — bus stop.
Road noise across the postcode
Modelled day and night-time noise levels around SW1X 8DJ from Defra's strategic mapping. The pin marks this postcode's centroid.
Daytime· 07:00 – 23:00
60.3dB
Everything within walking distance
Schools, transport stops and scenic spots near this property — 87 points of interest in total.
Common questions
The questions buyers, sellers and homeowners most often ask about 12a, Lyall Mews, Westminster, London, SW1X 8DJ. Each answer is also embedded as structured data for search engines.
