40 Firs Walk, Tewin, Welwyn, AL6 0NZ
About 40 Firs Walk
40 Firs Walk is a four-bedroom detached house in Tewin, Welwyn, Welwyn (AL6 0NZ). It has a recorded floor area of 136 m² (around 1464 sq ft), construction records dating it to 1950-1966 and council tax band G. The latest certificate (May 2013) shows an F (score 35), near the bottom of the EPC scale. The recommended improvements would lift it to D (score 66), a 2-band jump. The latest certificate is from May 2013, so improvements made since then won't be reflected.
At 136 m² it sits well below the postcode median (263 m² across 13 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 85% of similar EPCs). 7 planning records sit against the property, 6 approved, 1 refused. Past consents include an extension, meaningful when judging how the property has evolved. Across 2013–2021, sale prices on this property compounded at 6.2% per year. On a £-per-square-foot basis, the last sale (£889/sq ft) was about 201.1% above the typical sold price in the postcode. Most recent transfer: December 2021 at £1,301,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Know exactly what you're buying at 40 Firs Walk
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
What this property has
Inside
- Bedrooms4
- Bathrooms2
Energy performance
40 Firs Walk'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This certificate is over 10 years old and is no longer valid.Expired 23 May 2023
EPC Rating
Planning history
40 Firs Walk has been extended on multiple sides of the property across separate planning applications.
- Nov 2020ExtensionIn report
Extension: Single storey
Construction of an additional storey on top of the principal part of the bungalow to create first floor accommodation.
- Documents
- 22 docs on file
- Reference
- 3/20/2061/ASDPN
- Aug 2019OutlineIn report
Construction of three single storey outbuildings.
- Documents
- 39 docs on file
- Reference
- 3/19/1114/CLPO
We flagged 1 thing worth checking at 40 Firs Walk
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
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£1,378,000
Modelled from EPC, postcode comparables and a sale-price growth of 6.2% per year over 8 years.
£1,301,000
Growth on file: 6.2% per year over 8 years.
Sales timeline
7 December 2021Most recent
£1,301,000
+62.6%over 8 years30 October 2013
£800,000
Median price across the last 5 sales in AL6 0NZ: £1,300,000 (2023–2021).
Nearby sales in AL6 0NZ
Everything we know about 40 Firs Walk, 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

Versus other Firs Walk homes
On price per m², 40 Firs Walk stands well clear of the street.
Price per m²
£9,566
Street avg £5,733
Floor Area
136 m²
Street avg 236 m²
Habitable Rooms
7 rooms
Street avg 9 rooms
CO₂ Emissions
9.3 t/year
Street avg 9.3 t/year
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1 Bluebells
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1 Desborough Drive, Tewin
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The neighbourhood at a glance
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.7 km
Desborough Drive — bus stop.
Closest school
1.9 km
Tewin Cowper Church of England Voluntary Aided Primary School. 7 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.