21, Constance Place, Knebworth has an Energy Performance Rating (EPC) of B. This is based on the most recent assessment, dated 13 Jun 2016.

The property is not connected to mains gas and has high performance glazing. It is heated using air source heat pump (underfloor, electric).

21, Constance Place, Knebworth last changed hands on 22nd July 2024, selling for £485,000. The transaction was logged as a leasehold flat by HM Land Registry.

In total it has sold twice since 1995.

The market for similar properties has dropped by 13.2% since July 2024.

• Sold Jul 2024£485,000
• Sold Jul 2016£450,567

Land Registry records and our Estate Agent network show 39 sales of comparable properties within 920 metres of 21, Constance Place, Knebworth since 2016.

Most recently, 9, Lowe House, Knebworth, SG3 6EU, a leasehold flat, sold at £333,000 on the 17th December 2025.

Read more about house prices in SG3.

• Sold Dec 2025£333,000 | 3 Bed Flat9, Lowe House, Knebworth, SG3 6EU9, Lowe House, Knebworth, SG3 6EU
• Sold Mar 2025£480,500 | 3 Bed Flat12, Lowe House, Knebworth, SG3 6EU12, Lowe House, Knebworth, SG3 6EU
• Sold Dec 2024£380,000 | 3 Bed Flat40, Lowe House, Knebworth, SG3 6EU40, Lowe House, Knebworth, SG3 6EU
• Sold Aug 2024£448,500 | 3 Bed Flat47, Lowe House, Knebworth, SG3 6EU47, Lowe House, Knebworth, SG3 6EU
• Sold Jun 2024£460,500 | 3 Bed Flat38, Lowe House, Knebworth, SG3 6EU38, Lowe House, Knebworth, SG3 6EU
• Sold Jun 2024£450,000 | 3 Bed Flat5, Constance Place, Knebworth, SG3 6EE5, Constance Place, Knebworth, SG3 6EE
• Sold Apr 2024£380,000 | 3 Bed Flat19, Lowe House, Knebworth, SG3 6EU19, Lowe House, Knebworth, SG3 6EU
• Sold Apr 2024£420,000 | 3 Bed Flat3, Lowe House, Knebworth, SG3 6EU3, Lowe House, Knebworth, SG3 6EU
• Sold Nov 2023£427,900 | 3 Bed Flat22, Lowe House, Knebworth, SG3 6EU22, Lowe House, Knebworth, SG3 6EU
• Sold Oct 2023£450,000 | 3 Bed Flat45, Lowe House, Knebworth, SG3 6EU45, Lowe House, Knebworth, SG3 6EU
• Sold Nov 2022£497,000 | 3 Bed Flat29, Lowe House, Knebworth, SG3 6EU29, Lowe House, Knebworth, SG3 6EU
• Sold Nov 2022£465,000 | 3 Bed Flat20, Constance Place, Knebworth, SG3 6EE20, Constance Place, Knebworth, SG3 6EE
• Sold Dec 2021£480,000 | 3 Bed Flat46, Lowe House, Knebworth, SG3 6EU46, Lowe House, Knebworth, SG3 6EU
• Sold Apr 2021£365,000 | 3 Bed Flat6, Lowe House, Knebworth, SG3 6EU6, Lowe House, Knebworth, SG3 6EU
• Sold Feb 2021£385,000 | 3 Bed Flat12, Constance Place, Knebworth, SG3 6EE12, Constance Place, Knebworth, SG3 6EE
• Sold Aug 2020£407,500 | 3 Bed Flat3, Constance Place, Knebworth, SG3 6EE3, Constance Place, Knebworth, SG3 6EE
• Sold Sep 2017£390,000 | 3 Bed Flat11, Constance Place, Knebworth, SG3 6EE11, Constance Place, Knebworth, SG3 6EE
• Sold Aug 2016£399,950 | 3 Bed Flat6, Constance Place, Knebworth, SG3 6EE6, Constance Place, Knebworth, SG3 6EE
• Sold Aug 2016£435,950 | 3 Bed Flat26, Constance Place, Knebworth, SG3 6EE26, Constance Place, Knebworth, SG3 6EE
• Sold Jun 2016£429,950 | 3 Bed Flat4, Constance Place, Knebworth, SG3 6EE4, Constance Place, Knebworth, SG3 6EE

Our analysis of the public data ranks 21, Constance Place, Knebworth as the 3rd largest and the 3rd most expensive of the 26 addresses on Constance Place, Knebworth, SG3.

Against the SG3 postcode district average, it is £124k less expensive than the typical property.

• Knebworth Primary and Nursery School

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

  1.5 km away
• St Michael's Woolmer Green CofE VA Primary School

  1.5 km away

• Barnwell School

  2.9 km away
• Marriotts School

  4.4 km away
• Monk's Walk School

  5.3 km away

• Knebworth

  |

  500 m away
• Watton-at-Stone

  |

  4.4 km away
• Stevenage

  |

  4.5 km away

Environment Agency data suggests this area has a Very Low risk of flooding.