20 Hertford Road, Tewin, Welwyn, AL6 0JY
About 20 Hertford Road
20 Hertford Road is a five-bedroom detached house in Tewin, Welwyn, Welwyn (AL6 0JY). It has a recorded floor area of 164 m² (around 1765 sq ft), construction records dating it to 1967-1975 and council tax band G. The latest certificate (January 2016) shows a D (score 58), a step below the typical UK home. When first surveyed in December 2015 the rating was E, the property has climbed 1 band since. The recommended improvements would push it to C (score 78). The latest certificate is from January 2016, so improvements made since then won't be reflected.
2 planning records sit against the property, 1 approved, 1 refused. Past consents include an extension, meaningful when judging how the property has evolved. 10 years since the last transfer (May 2016). Across 2001–2016, sale prices on this property compounded at 7% per year. Today's modelled estimate of £888,000 is 18.4% above the 2016 sale price.
Know exactly what you're buying at 20 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
- Bedrooms5
- Bathrooms1
Energy performance
20 Hertford Road'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This certificate is over 10 years old and is no longer valid.Expired 25 Jan 2026
EPC Rating
Property Improvements
Changes detected from historical EPC data
Planning history
20 Hertford Road has 2 separate extension applications on the council record.
- Aug 2012ExtensionFullIn report
Extension: Single storey · Rear of property
Single storey rear extension
- Agent
- Hertford Planning Service
- Documents
- 9 docs on file
- Reference
- 3/12/1139/FP
- Aug 2012ExtensionFullIn report
Extension: Rear of property
Two storey rear extension and alterations to fenestration
- Agent
- Hertford Planning Service
- Documents
- 11 docs on file
- Reference
- 3/12/1145/FP
We flagged 1 thing worth checking at 20 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
Sale price has at least doubled since 2001.
£888,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.0% per year over 15 years.
£750,000
Growth on file: 7.0% per year over 15 years.
Sales timeline
26 May 2016Most recent
£750,000
+180.9%over 15 years15 January 2001
£267,000
Median price across the last 5 sales in AL6 0JY: £765,000 (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
£895,00022a, Hertford Road, Tewin, Welwyn, AL6 0JY
Sold Jun 2015
£755,0002a, Hertford Road, Tewin, Welwyn, AL6 0JY
Sold May 2015
£765,000
Everything we know about 20 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
Habitable Rooms for 20 Hertford Road runs comfortably ahead of the street norm.
Price per m²
£4,573
Street avg £5,033
Floor Area
164 m²
Street avg 155 m²
Habitable Rooms
8 rooms
Street avg 6 rooms
CO₂ Emissions
8.0 t/year
Street avg 5.6 t/year
Similar properties nearby
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1 Cob Lane Close, Digswell
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1 Chestnut Walk
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1 Churchfield Road, Tewin
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1 Barneswood
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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.