The Dower House, Grove Mill Lane, Watford, WD17 3TU
About The Dower House
The Dower House is a six-bedroom detached house in Watford (WD17 3TU). It has a recorded floor area of 451 m² (around 4855 sq ft), construction records dating it to before 1900 and council tax band H. The latest certificate (March 2024) shows an E (score 47), well below the UK norm with real room to improve. When first surveyed in February 2009 the rating was F, the property has climbed 1 band since. Between certificates, roof efficiency went from Good to Very Good, window efficiency went from Very Poor to Poor and lighting went from Very Poor to Very Good. The recommended improvements would push it to D (score 67). Other recorded features include a self-contained annexe and attached land beyond the plot.
At 451 m² the property is well over the postcode median (54 m² across 10 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. 6 bedrooms is on the larger side for this postcode, where 4 is the typical count. 9 planning records sit against the property, 6 approved, 0 refused. Past consents include tree works and an annexe, meaningful when judging how the property has evolved. The record references listed-building consent and conservation-area consent, which constrain future alterations. Across 1998–2014, sale prices on this property compounded at 9.1% per year. On a £-per-square-foot basis, the last sale (£795/sq ft) was about 83.1% above the typical sold price in the postcode. 12 years since the last transfer (July 2014).
What this property has
Inside
- Bedrooms6
- Dining roomYes
- EnsuiteYes
- StudyYes
Outside
- Private gardenYes
- Summer houseYes
- LandYes
Energy performance
The Dower House sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
EPC Rating
Certificate validity
Valid until 31 March 2034
Property Improvements
Changes detected from historical EPC data
Heating system changed
Changed to a more efficient fuel source
Heating controls changed
Hot water system changed
Single glazing replaced with double or better glazing
Wall insulation upgraded
Floor insulation added or improved
More low energy lighting installed
Wall insulation upgraded
Floor insulation added or improved
Upgraded to gas central heating
Connected to mains gas supply
Heating controls upgraded for better temperature management
Hot water system upgraded
Roof insulation improved
MVHR (mechanical ventilation with heat recovery) installed
Get a survey for this property
Level 3 Building Survey
Because the property was built before 1919, is a large detached home over 300m², and has been extended more than once, we believe a Level 3 building survey should be considered.
Planning history
The Dower House has multiple listed-building consents on file — alterations need formal heritage approval.
9 applications on record at The Dower House, Grove Mill Lane, Watford, WD17 3TU
- Nov 2007Tree WorksTreesOutcome in report
Works to trees in Conservation Area
Conservation Area- Documents
- 1 doc on file
- Reference
- 07/01547/TCA
- More recent applications — locked
- Tree WorksJun 2020Decision
- AnnexJan 2018Decision
+ 6 more applications in the report
Unlock The Dower House, Grove Mill Lane, Watford, WD17 3TU's full planning history
You're seeing the shape of it. The report has the substance.
- Every decision — granted, refused or withdrawn (9 on record)
- All 9 applications on this property in full, plus 1 notable nearby
- The 167 documents, officer reports & conditions
- What the pattern means for extending or converting here
One time fee only - money back guarantee
Sales history & valuation
Latest sale on The Dower House was the highest on Land Registry record across the postcode.
£3,529,000
Modelled from EPC, postcode comparables and a sale-price growth of 9.1% per year over 17 years.
£3,860,000
Growth on file: 9.1% per year over 17 years.
Sales timeline
27 July 2014Most recent
£3,860,000
-3.5%over 4 years9 August 2009
£4,000,000
+337.2%over 11 years9 January 1998
£915,000
Median price across the last 5 sales in WD17 3TU: £345,000 (2024–2020).
Nearby sales in WD17 3TU
7 The Grove Mill, Grove Mill Lane, Watford, WD17 3TU
Sold Jun 2024
£330,0001 The Grove Mill, Grove Mill Lane, Watford, WD17 3TU
Sold Nov 2023
£360,0009 The Grove Mill, Grove Mill Lane, Watford, WD17 3TU
Sold Nov 2022
£400,0003 The Grove Mill, Grove Mill Lane, Watford, WD17 3TU
Sold Jul 2022
£306,00011 The Grove Mill, Grove Mill Lane, Watford, WD17 3TU
Sold Aug 2018
£250,000
Similar properties nearby
The neighbourhood at a glance
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
266/mo
Falling year-on-year across the wider district.
Nearest stop
0.4 km
Grove Mill Lane — bus stop.
Closest school
0.7 km
Holy Rood Catholic Primary School. 26 schools nearby.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode

Daytime· 07:00 – 23:00
48.5dB

Night-time· 23:00 – 07:00
40.9dB







