21 St Mary Street, Monmouth, NP25 3DB
About 21 St Mary Street
21 St Mary Street is a mid-terrace house in Monmouth (NP25 3DB). It has a recorded floor area of 208 m² (around 2239 sq ft) and construction records dating it to 1900-1929. The latest certificate (May 2022) shows a D (score 65), on the cusp of jumping into the C band. The recommended improvements would lift it to B (score 81), a 2-band jump.
At 208 m² the property is well over the postcode median (76 m² across 28 EPCs), placing it in the larger end of the local stock. 4 planning records sit against the property, 4 approved, 0 refused. Past consents include an extension, new windows and HMO conversion, meaningful when judging how the property has evolved. Across 2019–2022, sale prices on this property compounded at 50.8% per year. On a £-per-square-foot basis, the last sale (£368/sq ft) was about 101.4% above the typical sold price in the postcode. Most recent transfer: November 2022 at £825,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Know exactly what you're buying at 21 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
Energy performance
21 St Mary Street's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Planning history
21 St Mary Street has been through 4 approved planning applications — a well-evolved property.
- May 2021ConditionsIn report
Discharge of conditions 4, 7, 9 and 10 relating to DM/2019/02042.
- Documents
- 8 docs on file
- Reference
- DM/2021/00268
- Apr 2020ExtensionConditionsIn report
Extension: Single storey · Rear of property
To retain the existing single storey extension to the rear of the property and enlarge the existing adjacent door opening.
- Documents
- 10 docs on file
- Reference
- DM/2019/02042
We flagged 1 thing worth checking at 21 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
Latest sale on 21 St Mary Street was the highest on Land Registry record across the postcode.
£757,000
Modelled from EPC, postcode comparables and a sale-price growth of 50.8% per year over 3 years.
£825,000
Growth on file: 50.8% per year over 3 years.
Sales timeline
14 November 2022Most recent
£825,000
+266.7%over 3 years16 September 2019
£225,000
Median price across the last 5 sales in NP25 3DB: £295,000 (2024–2022).
Nearby sales in NP25 3DB
6 St Mary Street, Monmouth, NP25 3DB
Sold May 2024
£245,0002 Angel Court, St Mary Street, Monmouth, NP25 3DB
Sold Jul 2023
£480,000St John Hall, St Mary Street, Monmouth, NP25 3DB
Sold Mar 2023
£504,5258 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 21 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 habitable rooms, 21 St Mary Street stands well clear of the street.
Price per m²
£3,966
Street avg £2,747
Floor Area
208 m²
Street avg 118 m²
Habitable Rooms
8 rooms
Street avg 5 rooms
CO₂ Emissions
8.2 t/year
Street avg 5.6 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.