Over the past 26 years, there have been 21 property sales recorded in the AL7 3SY postcode area. The highest sale price reached £455,000, while the most recent sale was for a semi-detached house sold in July 2025 for £455,000.

The estimated average property value in AL7 3SY currently stands at £273,432, which is approximately 40.9% lower than the city average - making it a relatively affordable option for buyers.

In terms of size, the average price per square metre is approximately £4,351.

Property prices in AL7 3SY have risen by 3.1% over the past year , with a total increase of 8.9% over the past five years , and a long-term rise of 38.8% over the past decade .

The most common type of property sold in the area is flat, making up around 62% of transactions , followed by semi-detached and terraced.

Housing in AL7 3SY is mixed, with 45% of homes being rented, indicating a diverse residential makeup.

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Property Sales

1 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Semi-detached
🛏️ 4bed
📐 980 sq ft
Today
£471,812
streetscan.co.uk estimate
2 Dec 2020
£420,000
14 Aug 2017
£400,000
More details

11 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

Today
£217,643
streetscan.co.uk estimate
20 Apr 2009
£130,000

12 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Flat
🛏️ 2bed
📐 506 sq ft
Today
£212,075
streetscan.co.uk estimate
27 Jun 2025
£200,000
20 Aug 2018
£173,000
More details

16 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Flat
🛏️ 2bed
📐 517 sq ft
Today
£206,724
streetscan.co.uk estimate
13 Jan 2023
£214,000
24 Jul 2020
£203,000
View +1 more
More details

17 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Flat
🛏️ 2bed
📐 495 sq ft
Today
£180,489
streetscan.co.uk estimate
16 May 2019
£177,500
24 Jan 2000
£55,000
More details

18 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Flat
🛏️ 3bed
📐 517 sq ft
Today
£190,133
streetscan.co.uk estimate
23 Aug 2012
£124,000
12 Dec 2003
£105,000
More details

19 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Flat
🛏️ 2bed
📐 445 sq ft
Today
£205,795
streetscan.co.uk estimate
1 Apr 2016
£183,000
13 Nov 2009
£107,000
More details

23 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Terraced
🛏️ 5bed
📐 893 sq ft
Today
£376,043
streetscan.co.uk estimate
28 Sep 2004
£169,000
5 Jul 2002
£125,000
More details

27 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Terraced
🛏️ 5bed
📐 958 sq ft
Today
£430,172
streetscan.co.uk estimate
30 Jun 2021
£390,000
31 Mar 2014
£210,000
More details

31 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Semi-detached
🛏️ 5bed
📐 883 sq ft
Today
£412,752
streetscan.co.uk estimate
9 Sep 2011
£215,000
More details

33 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Semi-detached
🛏️ 4bed
📐 883 sq ft
Today
£480,693
streetscan.co.uk estimate
18 Jul 2025
£455,000
More details

6 By The Mount, Welwyn Garden City, Welwyn Hatfield, Hertfordshire, AL7 3SY

🏠 Flat
🛏️ 3bed
📐 592 sq ft
Today
£205,420
streetscan.co.uk estimate
29 Jun 2020
£195,000
More details

Area Insights

Data Sources

Properties at AL7 3SY appear twenty-one times in the Land Registry records, with the latest transaction recorded on 18 Jul 2025. It also has eleven Energy Performance Certificates (EPC) entries, the earliest dating back to 26 Nov 2014. We use this data, to estimate the property's characteristics and current market value.

This website uses public sector information from:

These datasets are licensed under the Open Government Licence v3.0.
This website is not affiliated with or endorsed by HM Land Registry or DLUHC.

Disclaimer: StreetScan.co.uk makes all reasonable efforts to ensure the information provided on this website is current and accurate; however, no warranties or representations are made as to its completeness or accuracy. StreetScan.co.uk expressly disclaims any and all liability for any loss, damage, or expense arising directly or indirectly from the use of, or reliance upon, such information.