Our Data Sources
9, Mardley Hill, Welwyn has 31 entries in the Land Registry , most recently in March 2026 and a single entry in the EPC database dated September 2025.
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
Decorative condition can have a big effect on a property's value and this effect varies depending on the type, size and location of the property.
If 9, Mardley Hill, Welwyn is in very good condition we estimate a sale value of £638,763 and a rental value of £2,752 per month.
However, if the property needs a lot of cosmetic work we estimate a sale value of £565,761 and a rental value of £2,438 per month.
Plot Size
According to data from HM Land Registry, 9, Mardley Hill, Welwyn sits on a plot of 745 m2.
We have plot size data on 9 out of 9 other houses in the postcode and 9, Mardley Hill, Welwyn sits on the 8th largest plot.
Energy Efficiency
9, Mardley Hill, Welwyn has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 11 Sep 2025.
The property is connected to mains gas and has fully double glazed windows. It is heated using Boiler and radiators, mains gas.
Sold Prices
According to HM Land Registry, 9, Mardley Hill, Welwyn was last sold on 23rd March 2026 for £600,000 and was recorded as a freehold house.
The property has had 3 sales since 1995.
Since March 2026, the market for similar properties has dropped by 0.1%.
- Sold Mar 2026£600,000
- Sold May 2011£425,000
- Sold Jan 1997£134,000
Similar Properties Sold Nearby
According to the Land Registry and our network of Estate Agents, there have been 146 sales of properties similar to 9, Mardley Hill, Welwyn within a radius of 1.3 kilometres over the last 2 years.
The most recent example is 3, Scarff Close, Welwyn, AL6 0SZ, a freehold house which sold for £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 May 2024£630,000 | 3 Bed House48, Robbery Bottom Lane, Welwyn, AL6 0UN48, Robbery Bottom Lane, Welwyn, AL6 0UN
- Sold Jun 2016£475,000 | 4 Bed House4, Mardley Avenue, Welwyn, AL6 0UD4, Mardley Avenue, Welwyn, AL6 0UD
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
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Location Comparison
Mardley Hill, Welwyn, AL6 has a total of 39 addresses. According to our analysis of all the public data, 9, Mardley Hill, Welwyn is the 27th largest and the 33rd most expensive property on the street.
When compared to the postcode district it is £193k less expensive than the average property in AL6.
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Schools Nearby
- Oaklands Primary School700 m away
- St Michael's Woolmer Green CofE VA Primary School800 m away
- Knebworth Primary and Nursery School2.2 km away
- Monk's Walk School3.2 km away
- Ridgeway Academy4.8 km away
- Barnwell School5.1 km away
More reading links
Public Transport Nearby
- Welwyn North|2.4 km away
- Knebworth|2.4 km away
- Watton-at-Stone|4.9 km away
Available Internet Speeds
According to recent data from Ofcom, Superfast Broadband is available in this area.
According to recent data from Ofcom, Superfast Broadband is available in the area.
Risk of Flooding
According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.
