23 Firs Walk, Tewin, Welwyn, AL6 0NY
About 23 Firs Walk
23 Firs Walk is a detached house in Tewin, Welwyn, Welwyn (AL6 0NY). It has a recorded floor area of 177 m² (around 1905 sq ft), construction records dating it to 1950-1966 and council tax band G. The latest certificate (August 2017) shows an F (score 37), near the bottom of the EPC scale. The recommended improvements would lift it to D (score 67), a 2-band jump.
At 177 m² it's 24.7% smaller than the typical home in the postcode (235 m² median across 14 EPCs). On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. 5 planning records sit against the property, 4 approved, 1 refused. Past consents include an extension, solar panel installation and a garage conversion, meaningful when judging how the property has evolved. Across 2017–2023, sale prices on this property compounded at 6.1% per year. On a £-per-square-foot basis, the last sale (£656/sq ft) was about 219.7% above the typical sold price in the postcode. Last sale on file: £1,250,000 in August 2023.
Know exactly what you're buying at 23 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
Energy performance
23 Firs Walk sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
EPC Rating
Planning history
A a porch application was refused at 23 Firs Walk in 2024.
- Dec 2025Solar PanelsFullIn report
Demolish existing rear garage extension. Convert garage into habitable space. Construct single-storey side extension, two-storey front extension, and two-storey rear extension with balcony. Raise existing roof, install solar panels and skylights. Alterations to external materials and landscaping.
Extension- Documents
- 27 docs on file
- Reference
- 3/25/1492/HH
- Mar 2025ExtensionIn report
Extension: Single storey
Additional storey on top of the principle part of the existing dwellinghouse to raise the height from 6.7 metres to 9.5 metres.
- Documents
- 16 docs on file
- Reference
- 3/25/0135/ASDPN
We flagged 1 thing worth checking at 23 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
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Sales history & valuation
23 Firs Walk valuation sits well clear of the typical sold price in this postcode.
£1,232,000
Modelled from EPC, postcode comparables and a sale-price growth of 6.1% per year over 6 years.
£1,250,000
Growth on file: 6.1% per year over 6 years.
Sales timeline
29 August 2023Most recent
£1,250,000
+41.2%over 5 years16 November 2017
£885,500
Median price across the last 5 sales in AL6 0NY: £1,300,000 (2025–2015).
Nearby sales in AL6 0NY
Everything we know about 23 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
23 Firs Walk outperforms the street on price per m² by a wide margin.
Price per m²
£7,062
Street avg £4,430
Floor Area
177 m²
Street avg 244 m²
Habitable Rooms
8 rooms
Street avg 8 rooms
CO₂ Emissions
13.0 t/year
Street avg 7.9 t/year
Similar properties nearby
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.