12 Constance Place, Knebworth, SG3 6EE is a leasehold flat built between 2012-2021. The property offers approximately 861 square feet of living space and is situated on the 2nd floor of a 1-storey building. In this location, apartments of similar size usually have three bedrooms.

The estimated current market value of the property is £397,767 , which equates to approximately £462 per square foot. It was last sold on 23 Feb 2021 for £385,000. Since then, the value has increased by £12,767, representing a 3.3% increase, or approximately 0.6% per year.

The current estimated value of £397,767 is:

  • 8.8% higher than the average property price on Constance Place
  • 2.3% higher than the average in the SG3 6EE postcode area
  • and 27.2% lower than the average price for Knebworth as a whole

At the most recent EPC inspection on 19 May 2026, the property was recorded as owner-occupied.

View sold house prices in SG3 6EE

Building approximate location

About Property

Type
Flat
Built
2012-2021
Interior Size
861 sq ft
Tenure
Leasehold
Floor level
2nd floor of 1
Price (estimate)
£397,767
Price Per sq ft (estimate)
£462
Bedroom Count (estimate)
3 bedrooms

EPC Summary

12 Constance Place, Knebworth, North Hertfordshire, Hertfordshire, SG3 6EE has an Energy Performance Certificate (EPC) rating of B, based on the latest assessment carried out on 19 May 2026.

This property uses electric underfloor heating as its main heating source. Hot water is provided from off-peak electric immersion heater. The windows are fully double glazed.

The previous EPC assessment was conducted on 6 May 2016. The rating of B is unchanged, though the energy efficiency score decreased by 1.1%.

Since the previous assessment, several changes were observed:

  • The heating system changed from air source heat pump, underfloor, electric to electric underfloor heating, with no change in energy efficiency (average).
  • The hot water energy efficiency improving from poor to average, while the system remained as electric immersion, off-peak.
  • The roof construction or insulation changed from (other premises above) to (another dwelling above), with no change in energy efficiency (n/a).
  • The wall construction or insulation changed from average thermal transmittance 0.18 w/m-¦k to cavity wall, as built, insulated (assumed), changing energy efficiency from very good to good.
  • The windows were upgraded from high performance glazing to fully double glazed.
  • The lighting was updated from low energy lighting in all fixed outlets to good lighting efficiency, with efficiency changing from very good to good.
Heating Type
Electric underfloor heating
Average
Hot Water
Electric immersion, off-peak
Average
Walls
Cavity wall, as built, insulated (assumed)
Good
Windows
Fully double glazed
Average
Lighting
Good lighting efficiency
Good

Compared to SG3 6EE

9 th / 26
Price Rank
2% higher than average
5 th / 26
Size Rank
22% bigger than average
23 rd / 26
Price Per Sq FT Rank
16% lower than average

Sale History

Today
£397,767
streetscan.co.uk estimate
+3 %
23 Feb 2021
£385,000
Leasehold
-6.1 %
21 Jun 2016
£409,950
Leasehold

Flood Risk for this Property

Flood risk from rivers and the sea
Very low flood risk
Flood risk from surface water
High flood risk
Surface water flood hazard
High

* Results are based on Environment Agency flood risk mapping for the property UPRN where available. They are indicative and should not be treated as a site-specific flood survey.

Flood risk from rivers and the sea

This property has very low flood risk from rivers and the sea.

River and sea flooding includes flooding caused by overflowing rivers, estuaries, tidal waters and coastal surges.

Flood risk from surface water

This property has high surface water flood risk.

Surface water flooding can happen when heavy rainfall overwhelms drains, roads, gardens or other hard surfaces.

Flood depth indicators

Rivers and Sea
  • 0.2m depth No mapped risk
  • 0.3m depth No mapped risk
  • 0.6m depth No mapped risk
  • 0.9m depth No mapped risk
  • 1.2m depth No mapped risk
Surface Water
  • 0.2m depth Very low
  • 0.3m depth Very low
  • 0.6m depth Very low
  • 0.9m depth Very low
  • 1.2m depth Very low

Area Insights

Similar Properties Sold Nearby

10 Constance Place, Knebworth, SG3 6EE
rooms: 3
size: 786 sq ft
sale price: £315,000
sale date: 16 Jul 2025
15 Constance Place, Knebworth, SG3 6EE
rooms: 3
size: 818 sq ft
sale price: £399,950
sale date: 31 Aug 2016

Data Sources

The property at 12 Constance Place, Knebworth, SG3 6EE appears two times in HM Land Registry records, with the latest transaction recorded on 23 Feb 2021. It also has two Energy Performance Certificate (EPC) records, the earliest dating back to 19 May 2026. We use this information to estimate the property's characteristics, flood risk profile and current market value.

This website uses public sector information from:

These datasets are licensed under the Open Government Licence v3.0 .

StreetScan.co.uk is not affiliated with, endorsed by, or associated with HM Land Registry, DESNZ, MHCLG, Defra or the Environment Agency.


Disclaimer: StreetScan.co.uk makes all reasonable efforts to ensure that the information provided on this website is current and accurate. However, no warranties or representations are made regarding its completeness, accuracy, suitability or reliability. Property values, flood risk assessments and other derived information are estimates based on publicly available datasets and should not be relied upon as professional, legal, surveying, environmental, financial or insurance advice. StreetScan.co.uk expressly disclaims all liability for any loss, damage, cost or expense arising directly or indirectly from the use of, or reliance upon, information provided on this website.
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