21 Blackdown Close, Stevenage, SG1 6AY
About 21 Blackdown Close
21 Blackdown Close is a four-bedroom semi-detached house in Stevenage (SG1 6AY). It has a recorded floor area of 99 m² (around 1060 sq ft), construction records dating it to 2003-2006 and council tax band E. The latest certificate (June 2009) shows a C (score 72). The latest certificate is from June 2009, so improvements made since then won't be reflected. Other recorded features include a basement. Records show the property has been extended at some point in its history.
Last sale on file: £435,000 in June 2021. Across the public record there are 4 sales, relatively high churn for a single property. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend. At 99 m² it's 23.1% larger than the typical home in the postcode (80 m² median across 9 EPCs). Across 2000–2021, sale prices on this property compounded at 5.1% per year. On a £-per-square-foot basis, the last sale (£410/sq ft) was about 80.4% above the typical sold price in the postcode. One historical planning record sits against the property in 2013.
Know exactly what you're buying at 21 Blackdown Close
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
What this property has
Inside
- Bedrooms4
- Bathrooms2
- EnsuiteYes
- BasementYes
Outside
- Private gardenRear
- GarageYes
Building
- Previously extendedYes
- RefurbishedYes
Energy performance
21 Blackdown Close's EPC is over a decade old — improvements since won't be reflected.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 23 Jun 2019
EPC Rating
Planning history
- Oct 2013ExtensionFullIn report
Extension: Single storey · Side of property
Single storey side extension
- Agent
- James Rush Associates
- Documents
- 1 doc on file
- Reference
- 13/02164/1HH
What's in 21 Blackdown Close, Stevenage, SG1 6AY's planning history?
Refusals, disputes and full decisions on this property and nearby, in the report.
Sales history & valuation
21 Blackdown Close has more than doubled in price since the earliest registered sale in 2000.
£476,000
Modelled from EPC, postcode comparables and a sale-price growth of 5.1% per year over 21 years.
£435,000
Growth on file: 5.1% per year over 21 years.
Sales timeline
30 June 2021Most recent
£435,000
+81.3%over 11 years19 October 2009
£240,000
-2.8%over 5 years29 June 2004
£247,000
+59.9%over 3 years12 July 2000
£154,500
Median price across the last 5 sales in SG1 6AY: £368,000 (2021–2018).
Nearby sales in SG1 6AY
Everything we know about 21 Blackdown Close, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
- Am I paying too much?
- Is something wrong with it?
- Is the agent's story true?
- Will it hold its value?

Versus other Blackdown Close homes
21 Blackdown Close is notably below the street on years held.
Price per m²
£4,416
Street avg £3,418
Floor Area
99 m²
Street avg 86 m²
Habitable Rooms
6 rooms
Street avg 5 rooms
CO₂ Emissions
3.3 t/year
Street avg 3.0 t/year
Similar properties nearby
The neighbourhood at a glance
Reported crime in the wider district is trending notably upward year-on-year.
Crime
20/mo
Rising year-on-year across the wider district.
Nearest stop
0.3 km
Fairfield Way — bus stop.
Closest school
0.3 km
Round Diamond Primary School. 16 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode

Daytime· 07:00 – 23:00
46.4dB

Night-time· 23:00 – 07:00
36.7dB