12 Firs Walk, Tewin, Welwyn, AL6 0NZ
About 12 Firs Walk
12 Firs Walk is a five-bedroom detached house in Tewin, Welwyn, Welwyn (AL6 0NZ). It has a recorded floor area of 273 m² (around 2939 sq ft), construction records dating it to 1930-1949 and council tax band H. The latest certificate (October 2015) shows a D (score 55), a step below the typical UK home. The recommended improvements would push it to C (score 73). The latest certificate is from October 2015, so improvements made since then won't be reflected.
9 planning records sit against the property, 8 approved, 1 refused. Past consents include an extension, a porch, partial demolition and a conservatory, meaningful when judging how the property has evolved. At 273 m² it's 18.7% larger than the typical home in the postcode (230 m² median across 13 EPCs). Across 2010–2018, sale prices on this property compounded at 3.6% per year. Today's modelled estimate of £1,955,000 is 15% above the 2018 sale price. On a £-per-square-foot basis, the last sale (£579/sq ft) was about 96% above the typical sold price in the postcode. On the market in March 2018 and unlisted since — roughly 8 years.
Know exactly what you're buying at 12 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
- Bedrooms5
Energy performance
12 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This certificate is over 10 years old and is no longer valid.Expired 07 Oct 2025
EPC Rating
Planning history
A a single-storey rear extension application was refused at 12 Firs Walk in 2022.
- Jan 2026OutlineIn report
Erection of an outbuilding and construction of a driveway
- Documents
- 7 docs on file
- Reference
- 3/25/1711/CLPO
- Oct 2025PorchFullIn report
Demolition of two outbuildings and rear extensions, construction of rear and side extensions, relocation of a front porch, garage conversion, fenestration alterations, re-rendering of external walls and alterations to patio
ExtensionDemolition- Documents
- 17 docs on file
- Reference
- 3/25/0609/HH
We flagged 1 thing worth checking at 12 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
12 Firs Walk valuation sits well clear of the typical sold price in this postcode.
£1,955,000
Modelled from EPC, postcode comparables and a sale-price growth of 3.6% per year over 8 years.
£1,700,000
Growth on file: 3.6% per year over 8 years.
Sales timeline
22 March 2018Most recent
£1,700,000
+30.8%over 7 years28 July 2010
£1,300,000
Median price across the last 5 sales in AL6 0NZ: £1,301,000 (2023–2021).
Nearby sales in AL6 0NZ
Everything we know about 12 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
12 Firs Walk is notably below the street on co₂ emissions.
Price per m²
£6,227
Street avg £6,011
Floor Area
273 m²
Street avg 225 m²
Habitable Rooms
10 rooms
Street avg 8 rooms
CO₂ Emissions
12.8 t/year
Street avg 9.0 t/year
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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.