21a, Broadgates Avenue, Barnet, EN4 0NU
About 21a
21a is a three-bedroom detached house in Barnet (EN4 0NU). It has a recorded floor area of 264 m² (around 2842 sq ft), construction records dating it to 2019 and council tax band G. The latest certificate (July 2022) returns an A (score 93), the top energy band on the EPC scale. When first surveyed in January 2018 the rating was F, the property has climbed 5 bands since. Between certificates, wall efficiency went from Poor to Very Good, roof efficiency went from Poor to Very Good and window efficiency went from Poor to Very Good.
Held since August 1997 — that's 29 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. On energy efficiency it sits in the top 10% of properties in this postcode. Today's modelled estimate of £1,804,000 sits 511.5% above the 1997 sale of £295,000. On a £-per-square-foot basis, the last sale (£104/sq ft) was about 70.1% below the postcode norm. One planning record on file: an extension approved in 2022. Past consents include an extension, a loft conversion and a garage conversion, meaningful when judging how the property has evolved.
What this property has
Inside
- Bedrooms3
- Bathrooms1
Energy performance
21a ranks among the most efficient homes in the postcode for energy use.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Hot water system upgraded
High performance glazing installed
Cavity wall insulation installed
Loft insulation upgraded to recommended levels
Floor insulation added or improved
More low energy lighting installed
Planning history
- Aug 2022Loft ConversionFullIn report
Increase ridge height and conversion of loft space into habitable area, involving rear dormer with rooflights, conversion of garage into habitable room with part 1st floor extension, 2 storey front & rear extension with steps.
- Agent
- Grafeso
ExtensionGarage Conversion- Documents
- 25 docs on file
- Reference
- 22/01421/HOU
We flagged 1 thing worth checking at 21a
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
21a's modelled value sits at over four times its earliest registered sale price (1997).
£1,804,000
Modelled from EPC, postcode comparables.
£295,000
Recorded with HM Land Registry.
Sales timeline
12 August 1997Most recent
£295,000
Median price across the last 5 sales in EN4 0NU: £1,800,000 (2024–2021).
Nearby sales in EN4 0NU
Versus other Broadgates Avenue homes
On price per m², 21a runs well behind the street norm.
Price per m²
£1,117
Street avg £5,085
Floor Area
264 m²
Street avg 333 m²
CO₂ Emissions
1.6 t/year
Street avg 9.4 t/year
Years Held
29 years
Street avg 12 years
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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
Broadgates Avenue — bus stop.
Closest school
0.7 km
Monken Hadley CofE Primary School. 17 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
45.8dB

Night-time· 23:00 – 07:00
37.5dB







