According to data from HM Land Registry, 21, Mardley Avenue, Welwyn sits on a plot of 418 m².

We have plot size data on 12 out of 14 other houses in the postcode and 21, Mardley Avenue, Welwyn sits on the 10th largest plot.

According to HM Land Registry, 21, Mardley Avenue, Welwyn was last sold on 22nd November 1996 for £142,250 and was recorded as a freehold house.

The property has had 2 sales since 1995.

• Sold Nov 1996£142,250
• Sold Feb 1995£136,000

According to the Land Registry and our network of Estate Agents, there have been 1009 property sales within 1.3 kilometres of 21, Mardley Avenue, Welwyn over the last 2 years.

The most recent example is 17, Mardley Avenue, Welwyn, AL6 0TU, a freehold house which sold for £750,000 on the 31st January 2025.

Read more about house prices in AL6.

• Sold Jan 2025£750,000 | 4 Bed House17, Mardley Avenue, Welwyn, AL6 0TU17, Mardley Avenue, Welwyn, AL6 0TU
• Sold May 2009£242,000 | 3 Bed House12, Mardley Avenue, Welwyn, AL6 0UD12, Mardley Avenue, Welwyn, AL6 0UD
• Sold Jan 2007£456,000 | 4 Bed House29, Mardley Avenue, Welwyn, AL6 0TU29, Mardley Avenue, Welwyn, AL6 0TU

•Nearby is defined as the radius comprising the nearest 2,000 addresses.

• St Michael's Woolmer Green CofE VA Primary School

  600 m away
• Oaklands Primary School

  900 m away
• All Saints Church of England Voluntary Aided Primary School, Datchworth

  2.0 km away

• Monk's Walk School

  3.4 km away
• Ridgeway Academy

  4.9 km away
• Barnwell School

  5.0 km away

• Knebworth

  |

  2.3 km away
• Welwyn North

  |

  2.5 km away
• Watton-at-Stone

  |

  4.7 km away

According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.