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Get started21 Firmin Avenue is a four-bedroom detached house in Boughton Monchelsea, Maidstone, Maidstone (ME17 4RD). It has a recorded floor area of 137 m² (around 1475 sq ft), construction records dating it to 1996-2002 and council tax band F. The latest certificate (September 2025) shows a C (score 74). The rating has held steady at C across 2 certificates since May 2011. Between certificates, roof efficiency went from Good to Very Good and lighting went from Average to Good; while window efficiency dropped from Average to Poor. Records show the property has been extended at some point in its history.
Sale prices here have outpaced Maidstone HPI: 4.2% per year against 0% for the wider region. Today's modelled estimate of £526,000 is 16.9% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£305/sq ft) was about 46% above the typical sold price in the postcode. Last sale on file: £450,000 in March 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.
21 Firmin Avenue has more than doubled in price since the earliest registered sale in 2000.
£526,000
Modelled from EPC, postcode comparables and a sale-price growth of 4.2% per year over 20 years.
£450,000
Growth on file: 4.2% per year over 20 years.
On co₂ emissions, 21 Firmin Avenue stands well clear of the street.
Price per m²
£3,285
Street avg £3,165
Floor Area
137 m²
Street avg 116 m²
Habitable Rooms
8 rooms
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.4 km

Daytime· 07:00 – 23:00
47.3dB

Changes detected from historical EPC data
Loft insulation upgraded to recommended levels
More low energy lighting installed
Are we missing something? Tell us about home improvements to help adjust your valuation.
16 March 2021Most recent
£450,000
+34.3%over 9 years9 December 2011
£335,000
+34.0%over 9 years2 August 2002
£250,000
+28.2%over 1 year21 September 2000
£195,000
Median price across the last 5 sales in ME17 4RD: £420,000 (2025–2016).
7 Firmin Avenue Boughton Monchelsea Maidstone
Sold Mar 2025
9 Firmin Avenue Boughton Monchelsea Maidstone
Sold Aug 2018
19 Firmin Avenue Boughton Monchelsea Maidstone
Sold Oct 2016
17 Firmin Avenue Boughton Monchelsea Maidstone
Sold Feb 2016
11 Firmin Avenue Boughton Monchelsea Maidstone
Sold Nov 2015
Street avg 7 rooms
CO₂ Emissions
3.0 t/year
Street avg 4.2 t/year
ME17 4UY
Wrangleden Road — bus stop.
Closest school
0.7 km
Leigh Academy Tree Tops. 16 schools nearby.
Night-time· 23:00 – 07:00
37.2dB
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