Our Data Sources
18, Mardley Hill, Welwyn has 3 entries in the Land Registry , most recently in October 2024 and a single entry in the EPC database dated March 2020.
We combine this information with that of neighbouring properties to estimate the property attributes and values.
The local information is scored as 3 out of 5 and is considered of medium accuracy.
Price Range & Condition
In very good condition, we estimate 18, Mardley Hill, Welwyn would be worth £1,083,230, with a potential rental value of £3,092 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £959,433, with a rental value of £2,739 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Plot Size
18, Mardley Hill, Welwyn occupies a 801 m2 plot as recorded by HM Land Registry.
All 5 other houses in this postcode have recorded plot sizes, and this one ranks as the 4th largest.
Energy Efficiency
18, Mardley Hill, Welwyn has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 12 Mar 2020.
The property is connected to mains gas and has fully double glazed windows. It is heated using Boiler and radiators, mains gas.
Sold Prices
18, Mardley Hill, Welwyn last changed hands on 1st October 2024, selling for £1,050,000. The transaction was logged as a freehold house by HM Land Registry.
In total it has sold 3 times since 1995.
The market for similar properties has risen by 8.9% since October 2024.
- Sold Oct 2024£1,050,000
- Sold Aug 2020£830,000
- Sold Sep 2010£525,000
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 103 sales of comparable properties within 1.4 kilometres of 18, Mardley Hill, Welwyn across the last 2 years.
Most recently, 1, Rosecroft Lane, Welwyn, AL6 0UB, a freehold house, sold at £775,000 on the 12th December 2025.
Read more about house prices in AL6.
•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 18, Mardley Hill, Welwyn as the 14th largest and the 9th most expensive of the 39 addresses on Mardley Hill, Welwyn, AL6.
Against the AL6 postcode district average, it is £231k more expensive than the typical property.
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Schools Nearby
- St Michael's Woolmer Green CofE VA Primary School500 m away
- Oaklands Primary School1.0 km away
- Knebworth Primary and Nursery School1.9 km away
- Monk's Walk School3.5 km away
- Barnwell School4.8 km away
- Ridgeway Academy5.1 km away
More reading links
Public Transport Nearby
- Knebworth|2.1 km away
- Welwyn North|2.7 km away
- Watton-at-Stone|4.7 km away
Risk of Flooding
Environment Agency data suggests this area has a Very Low risk of flooding.
