21 Lancaster Avenue, Barnet, EN4 0EP
About 21 Lancaster Avenue
21 Lancaster Avenue is a six-bedroom semi-detached house in Barnet (EN4 0EP). It has a recorded floor area of 253 m² (around 2723 sq ft), construction records dating it to 1900-1929 and council tax band H. The latest certificate (May 2014) shows a D (score 57), a step below the typical UK home. When first surveyed in May 2009 the rating was F, the property has climbed 2 bands since. Between certificates, roof efficiency went from Average to Good, window efficiency went from Very Poor to Poor and lighting went from Very Poor to Poor. The recommended improvements would lift it to B (score 82), a 2-band jump. The latest certificate is from May 2014, so improvements made since then won't be reflected. Period features are noted in the property record. Our model identifies extension potential, subject to local planning policy.
At 253 m² the property is well over the postcode median (174 m² across 23 EPCs), placing it in the larger end of the local stock. Sold December 2020 for £1,785,000. Across the public record there are 4 sales, relatively high churn for a single property. 11 planning records sit against the property, 4 approved, 6 refused. Past consents include tree works, an extension and a basement excavation, meaningful when judging how the property has evolved. Across 2001–2020, sale prices on this property compounded at 4.6% per year. On a £-per-square-foot basis, the last sale (£655/sq ft) was about 86.8% above the typical sold price in the postcode.
What this property has
Inside
- Bedrooms6
- Bathrooms2
Outside
- GarageDouble, Detached
Building
- Period featuresYes
- Extension potentialPossible
Energy performance
21 Lancaster Avenue's carbon output runs well above what efficient homes in the postcode produce.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 01 May 2024
EPC Rating
Property Improvements
Changes detected from historical EPC data
Window efficiency improved
Roof insulation improved
Planning history
A recent planning application at 21 Lancaster Avenue was refused — worth checking the council file.
- Jul 2023Tree WorksTreesIn report
Works to trees in the Hadley Wood Conservation Area: 1x sycamore (T1), 2x Lawson cypress (T2/T3), 1x Pyrus (T4), 1x Malus (T5), 2x Prunus (T6/T7), 1x Leyland cypress hedge (G1) - fell.
- Agent
- Haywards Mowing
- Documents
- 3 docs on file
- Reference
- 23/01936/TCA
- Jun 2023BasementFullIn report
Extension: Side and rear of property
Two storey side and rear extension at ground and basement level, lowering of existing basement to create habitable rooms, alterations to first and second floor including rooflights and alterations to front and rear landscaping and levels.
- Agent
- ALAN COX ASSOCIATES LTD
Extension- Documents
- 13 docs on file
- Reference
- 22/04303/HOU
We flagged 1 thing worth checking at 21 Lancaster Avenue
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
Sale price has at least doubled since 2001.
£1,847,000
Modelled from EPC, postcode comparables and a sale-price growth of 4.6% per year over 19 years.
£1,785,000
Growth on file: 4.6% per year over 19 years.
Sales timeline
4 December 2020Most recent
£1,785,000
+61.5%over 11 years31 August 2009
£1,105,000
+20.1%over 4 years26 April 2005
£920,000
+21.9%over 3 years20 September 2001
£755,000
Median price across the last 5 sales in EN4 0EP: £1,700,000 (2025–2021).
Nearby sales in EN4 0EP
Flat 1, 33 Lancaster Avenue, Barnet, EN4 0EP
Sold Oct 2025
£595,00035 Lancaster Avenue, Barnet, EN4 0EP
Sold Mar 2024
£3,375,0007 Lancaster Avenue, Barnet, EN4 0EP
Sold Apr 2022
£1,895,00029 Lancaster Avenue, Barnet, EN4 0EP
Sold Jun 2021
£1,700,000Flat 3, 33 Lancaster Avenue, Barnet, EN4 0EP
Sold Jan 2021
£545,000
Versus other Lancaster Avenue homes
Habitable Rooms for 21 Lancaster Avenue runs comfortably ahead of the street norm.
Price per m²
£7,055
Street avg £5,877
Floor Area
253 m²
Street avg 282 m²
Habitable Rooms
12 rooms
Street avg 10 rooms
CO₂ Emissions
11.0 t/year
Street avg 11.4 t/year
Similar properties nearby
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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Duchy Road — bus stop.
Closest school
0.2 km
Hadley Wood Primary School. 12 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
49.3dB

Night-time· 23:00 – 07:00
39.6dB







