Our Data Sources
17, Mardley Avenue, Welwyn has 21 entries in the Land Registry , most recently in January 2025 and a single entry in the EPC database dated July 2023.
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 17, Mardley Avenue, Welwyn is in very good condition we estimate a sale value of £763,482 and a rental value of £2,976 per month.
However, if the property needs a lot of cosmetic work we estimate a sale value of £676,227 and a rental value of £2,636 per month.
Plot Size
According to data from HM Land Registry, 17, Mardley Avenue, Welwyn sits on a plot of 518 m2.
We have plot size data on 12 out of 14 other houses in the postcode and 17, Mardley Avenue, Welwyn sits on the 8th largest plot.
Energy Efficiency
17, Mardley Avenue, Welwyn has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 04 Jul 2023.
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, 17, Mardley Avenue, Welwyn was last sold on 31st January 2025 for £750,000 and was recorded as a freehold house.
The property has had 2 sales since 1995.
Since January 2025, the market for similar properties has risen by 6.5%.
- Sold Jan 2025£750,000
- Sold Dec 2006£395,000
Similar Properties Sold Nearby
According to the Land Registry and our network of Estate Agents, there have been 146 sales of properties similar to 17, Mardley Avenue, Welwyn within a radius of 1.3 kilometres over the last 2 years.
The most recent example is 50, Robbery Bottom Lane, Welwyn, AL6 0UN, a freehold house which sold for £658,000 on the 9th January 2026.
Read more about house prices in AL6.
- Sold Jan 2026£658,000 | 4 Bed House50, Robbery Bottom Lane, Welwyn, AL6 0UN50, Robbery Bottom Lane, Welwyn, AL6 0UN
- Sold Oct 2025£715,000 | 4 Bed House31, Hillside Way, Welwyn, AL6 0TY31, Hillside Way, Welwyn, AL6 0TY
- Sold May 2024£720,000 | 4 Bed House27, Marlborough Close, Welwyn, AL6 0UG27, Marlborough Close, Welwyn, AL6 0UG
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
Mardley Avenue, Welwyn, AL6 has a total of 30 addresses. According to our analysis of all the public data, 17, Mardley Avenue, Welwyn is the 12th largest and the 16th most expensive property on the street.
When compared to the postcode district it is £74k less expensive than the average property in AL6.
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Schools Nearby
- St Michael's Woolmer Green CofE VA Primary School600 m away
- Oaklands Primary School900 m away
- All Saints Church of England Voluntary Aided Primary School, Datchworth2.0 km away
- Monk's Walk School3.4 km away
- Ridgeway Academy4.9 km away
- Barnwell School5.0 km away
More reading links
Public Transport Nearby
- Knebworth|2.3 km away
- Welwyn North|2.5 km away
- Watton-at-Stone|4.7 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.
