40a, St James Road, Watford, WD18 0DX
About 40a
40a is a mid-terrace house in Watford (WD18 0DX). It has a recorded floor area of 162 m² (around 1744 sq ft), construction records dating it to 1900-1929 and council tax band D. The latest certificate (October 2021) shows a D (score 56), a step below the typical UK home. When first surveyed in August 2011 the rating was E, the property has climbed 1 band since. Between certificates, window efficiency went from Average to Good and lighting went from Very Poor to Very Good; while roof efficiency dropped from Average to Very Poor and hot-water efficiency dropped from Good to Average. The recommended improvements would push it to C (score 79).
Held since June 1999 — that's 27 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. At 162 m² the property is well over the postcode median (73 m² across 40 EPCs), placing it in the larger end of the local stock. Today's modelled estimate of £538,000 sits 642.1% above the 1999 sale of £72,500. On a £-per-square-foot basis, the last sale (£42/sq ft) was about 83.1% below the postcode norm. One planning record on file: a basement excavation approved in 2011. Past consents include a basement excavation, meaningful when judging how the property has evolved.
Know exactly what you're buying at 40a
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Energy performance
40a's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls changed
Hot water system changed
Window efficiency improved
More low energy lighting installed
Planning history
- Jan 2011BasementAmendmentIn report
Certificate of Lawfulness for new layout of ground floor to include blocking off a door and two windows on the side elevation and installation of a patio door to the rear and to provide shower room and utility room within basement area
Retrospective- Documents
- 25 docs on file
- Reference
- 10/01177/LDC
We flagged 1 thing worth checking at 40a
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
30-day money-back guarantee
Sales history & valuation
40a's modelled value sits at over four times its earliest registered sale price (1999).
£538,000
Modelled from EPC, postcode comparables.
£72,500
Recorded with HM Land Registry.
Sales timeline
15 June 1999Most recent
£72,500
Median price across the last 5 sales in WD18 0DX: £395,000 (2025–2025).
Nearby sales in WD18 0DX
Everything we know about 40a, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
- Signs of HMO activity in the area
Versus other St James Road homes
40a is notably below the street on price per m².
Price per m²
£448
Street avg £3,977
Floor Area
162 m²
Street avg 89 m²
Habitable Rooms
9 rooms
Street avg 5 rooms
CO₂ Emissions
8.1 t/year
Street avg 4.7 t/year
Similar properties nearby
The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
8/mo
Steady year-on-year across the wider district.
Nearest stop
0.3 km
The Hornets — bus stop.
Closest school
0.3 km
Watford Grammar School for Girls. 37 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
54.0dB
Night-time· 23:00 – 07:00
44.6dB