1 Duchess Close, Osbaston, Monmouth, NP25 3JL
About 1 Duchess Close
1 Duchess Close is a three-bedroom detached house in Osbaston, Monmouth, Monmouth (NP25 3JL). It has a recorded floor area of 87 m² (around 936 sq ft), construction records dating it to 1967-1975 and council tax band E. The latest certificate (October 2018) shows a D (score 68), on the cusp of jumping into the C band. When first surveyed in September 2017 the rating was E, the property has climbed 1 band since. Between certificates, window efficiency went from Very Poor to Average and lighting went from Very Poor to Very Good. The recommended improvements would lift it to B (score 84), a 2-band jump.
One planning record on file: an extension approved in 2018. Past consents include an extension, meaningful when judging how the property has evolved. Across 2017–2021, sale prices on this property compounded at 12.3% per year. Today's modelled estimate of £387,000 is 22.9% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£336/sq ft) was about 29% above the typical sold price in the postcode. Last sale on file: £315,000 in June 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Know exactly what you're buying at 1 Duchess Close
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
What this property has
Inside
- Bedrooms3
- Bathrooms2
- Dining roomYes
- EnsuiteYes
Outside
- Private gardenYes
- GarageYes
Building
- RefurbishedYes
Energy performance
Recommended upgrades on file would lift this property by multiple EPC bands.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Single glazing replaced with double or better glazing
More low energy lighting installed
Planning history
1 Duchess Close has an approved single-storey rear extension on the planning record.
- Apr 2018ExtensionFullIn report
Extension: Single storey · Rear of property
Single storey extension to rear of property. Construction of new patio, alterations to existing retaining walls and adjustment of levels within garden area.
- Documents
- 5 docs on file
- Reference
- DM/2018/00518
We flagged 1 thing worth checking at 1 Duchess Close
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.
- Larger development activity nearby
30-day money-back guarantee
Sales history & valuation
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£387,000
Modelled from EPC, postcode comparables and a sale-price growth of 12.3% per year over 4 years.
£315,000
Growth on file: 12.3% per year over 4 years.
Sales timeline
10 June 2021Most recent
£315,000
+50.0%over 3 years8 December 2017
£210,000
Median price across the last 5 sales in NP25 3JL: £305,000 (2025–2020).
Nearby sales in NP25 3JL
2 Duchess Close, Osbaston, Monmouth, NP25 3JL
Sold Mar 2025
£160,0008 Duchess Close, Osbaston, Monmouth, NP25 3JL
Sold Dec 2022
£305,0007 Duchess Close, Osbaston, Monmouth, NP25 3JL
Sold Mar 2022
£495,0004 Duchess Close, Osbaston, Monmouth, NP25 3JL
Sold Oct 2020
£405,0003 Duchess Close, Osbaston, Monmouth, NP25 3JL
Sold Jul 2017
£275,000
Everything we know about 1 Duchess Close, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
- Larger development activity nearby

Versus other Duchess Close homes
Price per m²
£3,621
Street avg £3,331
Floor Area
87 m²
Street avg 99 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
3.5 t/year
Street avg 3.8 t/year
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The neighbourhood at a glance
Crime
1/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Duchess Close — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.