12 Hertford Road, Tewin, Welwyn, AL6 0JY
About 12 Hertford Road
12 Hertford Road is a four-bedroom detached house in Tewin, Welwyn, Welwyn (AL6 0JY). It has a recorded floor area of 207 m² (around 2228 sq ft), construction records dating it to 2007 onwards and council tax band E. The latest certificate (August 2014) shows a C (score 79), near the top of the C band. When first surveyed in April 2012 the rating was D, the property has climbed 1 band since. Between certificates, roof efficiency went from Average to Good, window efficiency went from Average to Good and lighting went from Very Poor to Very Good. The recommended improvements would push it to B (score 85). The latest certificate is from August 2014, so improvements made since then won't be reflected.
Today's modelled estimate of £738,000 sits 69.7% above the 2012 sale of £435,000. On a £-per-square-foot basis, the last sale (£195/sq ft) was about 54% below the postcode norm. 3 planning records sit against the property, 3 approved, 0 refused. Past consents include an extension and a garage conversion, meaningful when judging how the property has evolved. At 207 m² it's 26.2% larger than the typical home in the postcode (164 m² median across 16 EPCs). Last sold in August 2012, so it's been off the market for around 14 years.
Know exactly what you're buying at 12 Hertford Road
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
- Open-plan layoutYes
- EnsuiteYes
Outside
- Private gardenSouth-facing
Building
- RefurbishedYes
Energy performance
12 Hertford Road's EPC is over a decade old — improvements since won't be reflected.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 05 Aug 2024
EPC Rating
Property Improvements
Changes detected from historical EPC data
Window efficiency improved
Roof insulation improved
Floor insulation added or improved
More low energy lighting installed
Planning history
12 Hertford Road has been extended on multiple sides of the property across separate planning applications.
- May 2013ExtensionFullIn report
Extension: Two storey · Front of property
Two storey front extension, conservation style rooflights and front dormers.
- Agent
- STS Structural Engineering Ltd
- Documents
- 8 docs on file
- Reference
- 3/13/0421/FP
- Oct 2012Garage ConversionFullIn report
Extension: Rear of property
Two storey rear extension and conversion of the garage to a habitable room.
- Agent
- STS Structural Engineering Ltd
Extension- Documents
- 17 docs on file
- Reference
- 3/12/1430/FP
We flagged 1 thing worth checking at 12 Hertford Road
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
£738,000
Modelled from EPC, postcode comparables.
£435,000
Recorded with HM Land Registry.
Sales timeline
14 August 2012Most recent
£435,000
Median price across the last 5 sales in AL6 0JY: £755,000 (2021–2015).
Nearby sales in AL6 0JY
4 Hertford Road, Tewin, Welwyn, AL6 0JY
Sold Jun 2021
£516,00012a, Hertford Road, Tewin, Welwyn, AL6 0JY
Sold Mar 2019
£875,00012b, Hertford Road, Tewin, Welwyn, AL6 0JY
Sold Feb 2019
£895,00020 Hertford Road, Tewin, Welwyn, AL6 0JY
Sold May 2016
£750,00022a, Hertford Road, Tewin, Welwyn, AL6 0JY
Sold Jun 2015
£755,000
Everything we know about 12 Hertford Road, 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 Hertford Road homes
12 Hertford Road is notably below the street on price per m².
Price per m²
£2,101
Street avg £5,258
Floor Area
207 m²
Street avg 153 m²
Habitable Rooms
7 rooms
Street avg 6 rooms
CO₂ Emissions
3.9 t/year
Street avg 5.9 t/year
Similar properties nearby
The neighbourhood at a glance
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Rose and Crown PH — bus stop.
Closest school
0.1 km
Tewin Cowper Church of England Voluntary Aided Primary School. 8 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.