6 St Mary Street, Monmouth, NP25 3DB
About 6 St Mary Street
6 St Mary Street is a three-bedroom mid-terrace house in Monmouth (NP25 3DB). It has a recorded floor area of 105 m² (around 1130 sq ft), construction records dating it to before 1900 and council tax band E. It is a listed building, which means external alterations are tightly controlled but it may qualify for heritage tax reliefs. Our model identifies extension potential, subject to local planning policy. The latest certificate (June 2023) shows a D (score 59), a step below the typical UK home. The recommended improvements would lift it to B (score 86), a 2-band jump.
At 105 m² the property is well over the postcode median (76 m² across 28 EPCs), placing it in the larger end of the local stock. One planning record on file: new windows approved in 2025. Past consents include new windows, meaningful when judging how the property has evolved. Across 2001–2024, sale prices on this property compounded at 2.7% per year. Today's modelled estimate of £299,000 is 22% above the 2024 sale price. On a £-per-square-foot basis, the last sale (£217/sq ft) was about 18.5% above the typical sold price in the postcode. Last sale on file: £245,000 in May 2024.
Know exactly what you're buying at 6 St Mary Street
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
- Bathrooms1
Outside
- Private gardenYes
Building
- Listed buildingYes
- Extension potentialPossible
Energy performance
Recommended upgrades on file would lift this property by multiple EPC bands.
EPC Rating
Planning history
- Sept 2025RenovationHeritageIn report
Repair windows, chimney, replace front & back doors, re-render and paint facade, fit wood pellet heating
New Windows- Documents
- 20 docs on file
- Reference
- DM/2025/00720
We flagged 1 thing worth checking at 6 St Mary Street
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
6 St Mary Street valuation sits well clear of the typical sold price in this postcode.
£299,000
Modelled from EPC, postcode comparables and a sale-price growth of 2.7% per year over 23 years.
£245,000
Growth on file: 2.7% per year over 23 years.
Sales timeline
9 May 2024Most recent
£245,000
+81.5%over 22 years16 August 2001
£135,000
Median price across the last 5 sales in NP25 3DB: £480,000 (2023–2022).
Nearby sales in NP25 3DB
2 Angel Court, St Mary Street, Monmouth, NP25 3DB
Sold Jul 2023
£480,000St John Hall, St Mary Street, Monmouth, NP25 3DB
Sold Mar 2023
£504,52521 St Mary Street, Monmouth, NP25 3DB
Sold Nov 2022
£825,0008 St Mary Street, Monmouth, NP25 3DB
Sold Aug 2022
£182,5004 St Mary Street, Monmouth, NP25 3DB
Sold Jun 2022
£295,000
Everything we know about 6 St Mary Street, 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 St Mary Street homes
On years held, 6 St Mary Street runs well behind the street norm.
Price per m²
£2,333
Street avg £2,895
Floor Area
105 m²
Street avg 125 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
5.4 t/year
Street avg 5.8 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
Agincourt Square — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.