12b, St Johns Road, Watford, WD17 1PT
About 12b
12b is a one-bedroom mid-terrace house in Watford (WD17 1PT). It has a recorded floor area of 44 m² (around 474 sq ft), construction records dating it to 1930-1949 and council tax band B. The latest certificate (July 2020) shows a D (score 67), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since September 2010. Between certificates, window efficiency went from Poor to Average and lighting went from Very Poor to Very Good; while hot-water efficiency dropped from Very Good to Good and main heating dropped from Very Good to Good. The recommended improvements would push it to C (score 76). At 44 m² this is the 11th smallest of 23 units on EPC record in the building, where floor areas span 16–171 m². The building's EPC ratings span F to C across 23 units on file.
Across 1998–2020, sale prices on this property compounded at 7% per year. On a £-per-square-foot basis, the last sale (£504/sq ft) was about 59.8% above the typical sold price in the postcode. Most recent transfer: December 2020 at £238,716.
What this property has
Inside
- Bedrooms1
- Bathrooms1
- Dining roomYes
- Utility roomYes
Outside
- ParkingAllocated
Everything you need to know about 12b
The true value, the hidden risks and the full sale history, in one report.
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The data behind every report
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water efficiency decreased
Windows upgraded, improving insulation
More low energy lighting installed
Planning history
12b has no planning applications on record.
Notable planning nearby
7applications of note in the surrounding area
We flagged 2 things worth checking at 12b
Independent checks surfaced things a buyer would want to understand before offering. The report explains each one in full, with the underlying data and what to ask.
- Signs of HMO activity in the area
- Larger development activity nearby
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Sales history & valuation
Price for 12b has grown more than fourfold since the 1998 starting point.
£255,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.0% per year over 22 years.
£238,716
Growth on file: 7.0% per year over 22 years.
Sales timeline
21 December 2020Most recent
£238,716
+70.5%over 7 years2 May 2013
£140,000
+164.2%over 14 years3 September 1998
£53,000
Median price across the last 5 sales in WD17 1PT: £580,000 (2025–2022).
Nearby sales in WD17 1PT
Versus other St Johns Road homes
12b outperforms the street on habitable rooms by a wide margin.
Price per m²
£5,425
Street avg £8,047
Floor Area
44 m²
Street avg 43 m²
Habitable Rooms
3 rooms
Street avg 2 rooms
CO₂ Emissions
2.1 t/year
Street avg 2.2 t/year
Everything you need to know about 12b
The true value, the hidden risks and the full sale history, in one report.
30-day money-back guarantee
The data behind every report
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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
10/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
St John's Road — bus stop.
Closest school
0.4 km
Watford St John's Church of England Primary School. 35 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
54.1dB
Night-time· 23:00 – 07:00
44.7dB