40a, Monks Avenue, Barnet, EN5 1DD
About 40a
40a is a semi-detached house in Barnet (EN5 1DD). It has a recorded floor area of 81 m² (around 872 sq ft), construction records dating it to 1930-1949 and council tax band C. The latest certificate (February 2020) shows a D (score 57), a step below the typical UK home. Earlier certificates rated it C (March 2009); the latest reading is one band lower. Between certificates, lighting went from Very Poor to Very Good; while roof efficiency dropped from Good to Very Poor and window efficiency dropped from Good to Average. The recommended improvements would push it to C (score 75).
Across 2000–2020, sale prices on this property compounded at 9.3% per year. Today's modelled estimate of £336,000 is 18% below the 2020 sale of £410,000, an unusual pattern given regional price growth and worth checking against the EPC condition. On a £-per-square-foot basis, the last sale (£470/sq ft) was about 77.3% above the typical sold price in the postcode. At 81 m² it sits well below the postcode median (139 m² across 12 EPCs), making it one of the more compact homes locally. Sold July 2020 for £410,000. Across the public record there are 5 sales, relatively high churn for a single property. One planning record on file: a loft conversion approved in 2018. Past consents include a loft conversion, meaningful when judging how the property has evolved.
Know exactly what you're buying at 40a
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
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls changed
Hot water efficiency decreased
More low energy lighting installed
Planning history
- Feb 2018Loft ConversionFullIn report
Roof extension involving a rear dormer windows and 2no. rooflights to front [Amended Description]
- Agent
- Rooftop Rooms
- Documents
- 7 docs on file
- Reference
- 17/7109/FUL
We flagged 1 thing worth checking at 40a
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
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Sales history & valuation
Price for 40a has grown more than fourfold since the 2000 starting point.
£336,000
Modelled from EPC, postcode comparables and a sale-price growth of 9.3% per year over 20 years.
£410,000
Growth on file: 9.3% per year over 20 years.
Sales timeline
22 July 2020Most recent
£410,000
+134.3%over 10 years14 October 2009
£175,000
-2.8%over 3 years6 August 2006
£179,950
+18.4%over 2 years5 March 2004
£152,000
+120.3%over 3 years10 August 2000
£69,000
Median price across the last 5 sales in EN5 1DD: £805,000 (2024–2018).
Everything we know about 40a, 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

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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.3 km
Lyonsdown Avenue — bus stop.
Closest school
0.9 km
St Mary's CofE Primary School, East Barnet. 36 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
51.5dB

Night-time· 23:00 – 07:00
41.7dB