1 Dewars Close, Welwyn, AL6 9RR
About 1 Dewars Close
1 Dewars Close is a three-bedroom detached house in Welwyn (AL6 9RR). It has a recorded floor area of 301 m² (around 3240 sq ft), construction records dating it to 1967-1975 and council tax band F. The latest certificate (November 2025) shows a C (score 77), near the top of the C band. When first surveyed in February 2010 the rating was E, the property has climbed 2 bands since. Between certificates, wall efficiency went from Good to Very Good, roof efficiency went from Average to Good and window efficiency went from Average to Good. The recommended improvements would push it to B (score 81).
Today's modelled estimate of £1,404,000 sits 84.7% above the 2023 sale of £760,000. On a £-per-square-foot basis, the last sale (£235/sq ft) was about 42.5% below the postcode norm. 2 planning records sit against the property, 1 approved, 1 refused. Past consents include an extension, meaningful when judging how the property has evolved. Most recent transfer: March 2023 at £760,000.
Know exactly what you're buying at 1 Dewars Close
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
What this property has
Inside
- Bedrooms3
- Bathrooms1
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water system changed
Windows upgraded, improving insulation
More low energy lighting installed
Heating system upgraded to a more efficient system
Heating controls upgraded for better temperature management
Hot water system upgraded
Wall insulation improved
Roof insulation improved
Floor insulation added or improved
More low energy lighting installed
Planning history
A recent planning application at 1 Dewars Close was refused — worth checking the council file.
- Sept 2023ExtensionFullIn report
Extension: Part single, part two storey · Side and rear of property
Erection of a single storey rear extension with first floor rear and side extensions, single storey front and side extensions and alterations to the existing fenestration
- Reference
- 6/2023/1393/HOUSE
- May 2023ExtensionFullIn report
Extension: Part single, part two storey · Side and rear of property
Erection of single storey rear extension, first floor side extension to both sides & front single storey extension
- Reference
- 6/2023/0734/HOUSE
What's in 1 Dewars Close, Welwyn, AL6 9RR's planning history?
Refusals, disputes and full decisions on this property and nearby, in the report.
Sales history & valuation
1 Dewars Close valuation sits well clear of the typical sold price in this postcode.
£1,404,000
Modelled from EPC, postcode comparables.
£760,000
Recorded with HM Land Registry.
Sales timeline
10 March 2023Most recent
£760,000
Median price across the last 5 sales in AL6 9RR: £595,000 (2023–2001).
Everything we know about 1 Dewars Close, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
- Am I paying too much?
- Is something wrong with it?
- Is the agent's story true?
- Will it hold its value?

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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
Carleton Rise — bus stop.
Closest school
0.9 km
Welwyn St Mary's Church of England Voluntary Aided Primary School. 9 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.