Our Data Sources
12, Mardley Avenue, Welwyn has a single entry in the Land Registry from May 2009 and a single entry in the EPC database dated February 2009.
We combine this information with that of neighbouring properties to estimate the property attributes and values.
The local information is scored as 1 out of 5 and is considered of low accuracy.
Price Range & Condition
In very good condition, we estimate 12, Mardley Avenue, Welwyn would be worth £637,793, with a potential rental value of £2,697 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £564,902, with a rental value of £2,389 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Plot Size
12, Mardley Avenue, Welwyn occupies a 870 m2 plot as recorded by HM Land Registry.
Of the 13 other houses in this postcode, 12 have recorded plot sizes, and this one ranks as the 5th largest.
Energy Efficiency
12, Mardley Avenue, Welwyn has an Energy Performance Rating (EPC) of F. This is based on the most recent assessment, dated 23 Feb 2009.
The property is connected to mains gas and has partial double glazing. It is heated using Boiler and radiators, mains gas.
Sold Prices
12, Mardley Avenue, Welwyn last changed hands on 5th May 2009, selling for £242,000. The transaction was logged as a freehold house by HM Land Registry.
That is its only recorded sale since 1995.
The market for similar properties has risen by 99.8% since May 2009.
- Sold May 2009£242,000
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 159 sales of comparable properties within 1.3 kilometres of 12, Mardley Avenue, Welwyn across the last 2 years.
Most recently, 3, Scarff Close, Welwyn, AL6 0SZ, a freehold house, sold at £595,000 on the 2nd April 2026.
Read more about house prices in AL6.
- Sold Apr 2026£595,000 | 3 Bed House3, Scarff Close, Welwyn, AL6 0SZ3, Scarff Close, Welwyn, AL6 0SZ
- Sold Mar 2026£600,000 | 3 Bed House9, Mardley Hill, Welwyn, AL6 0UE9, Mardley Hill, Welwyn, AL6 0UE
- Sold Feb 2025£575,000 | 3 Bed House45, Mardley Hill, Welwyn, AL6 0TT45, Mardley Hill, Welwyn, AL6 0TT
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
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Location Comparison
Our analysis of the public data ranks 12, Mardley Avenue, Welwyn as the 30th largest and the 29th most expensive of the 30 addresses on Mardley Avenue, Welwyn, AL6.
Against the AL6 postcode district average, it is £194k less expensive than the typical property.
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Schools Nearby
- St Michael's Woolmer Green CofE VA Primary School700 m away
- Oaklands Primary School800 m away
- All Saints Church of England Voluntary Aided Primary School, Datchworth2.1 km away
- Monk's Walk School3.3 km away
- Ridgeway Academy4.9 km away
- Barnwell School5.0 km away
More reading links
Public Transport Nearby
- Knebworth|2.4 km away
- Welwyn North|2.5 km away
- Watton-at-Stone|4.8 km away
Available Internet Speeds
Ofcom's latest figures show superfast broadband available in this area.
According to recent data from Ofcom, Superfast Broadband is available in the area.
Risk of Flooding
Environment Agency data suggests this area has a Very Low risk of flooding.
