Model valuation£417,0008 Busby Close
Local market context
21 Duffryn Avenue, Cardiff, CF23 6LE
Estimated value
£616,000
- Since the 1997 sale (£105,000)+487%
- Against CF23 6LE's recent median (£440,000)+40%
Newest record on this page: June 2026. Land Registry and EPC registers update monthly, so this page can trail them by 2–3 months.
Property type
Semi-detached
Habitable rooms
8
From EPC
Floor area
150 m²
1615 sq ft
Energy rating
C
Score 75
Council tax
Band F
Tenure
Owner Occupied
About this valuation
How the figure is worked out and what it's based on. If you know this home, you can tell other visitors what you think it's worth.
Our estimate
£616,000
- Against its 1997 sale (£105,000)+487%
- Against CF23 6LE's recent median (£440,000)+40%
Your note and figure are shown publicly on this page.
How the estimate is made
The estimate for 21 Duffryn Avenue is modelled from its 150 m² EPC floor area, its 1 recorded sale and recent sales of comparable homes in CF23 6LE. It is an automated estimate, not a survey or mortgage valuation: condition, layout and improvements that aren't on record can move the real figure either way.
What it's based on
Floor area
150 m² from the EPC lodged in June 2026
Sales of this home
1 sale recorded, the latest in 1997
Recent sales in CF23 6LE
5 sales, median £440,000 (2023–2017)
This page or the full report?
| Data | This page | Full report |
|---|---|---|
| Sales | Latest sale shown: July 2023 | Latest available records, read when you order |
| Valuation | Estimate from the last refresh | Analysed against comparable sales |
| Planning | None on this home | Full history, plus nearby schemes |
| Flood risk | Not shown | Included |
Sales history & valuation
Every recorded sale of this home, how its price has moved, and what neighbouring properties have sold for.
21 Duffryn Avenue's modelled value sits at over four times its earliest registered sale price (1997).
Sales timeline
12 October 1997Most recent
£105,000
Median price across the last 5 sales in CF23 6LE: £440,000 (2023–2017).
Nearby sales in CF23 6LE
What this page doesn't show
Nothing is flagged from the data on this page, but these checks are only run in the report. The detail, evidence and what to ask about it are in the Risks Report.
- Flood risk from rivers, sea and surface waterIn report
- Subsidence and ground-stability signalsIn report
- Refusals, enforcement and big schemes nearbyIn report
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About 21 Duffryn Avenue
A plain-English summary derived from public records, EPC certificates, sold prices and local data.
21 Duffryn Avenue is a semi-detached house in Cardiff (CF23 6LE). It has a recorded floor area of 150 m² (around 1615 sq ft), construction records dating it to 1967-1975 and council tax band F. The latest certificate (June 2026) shows a C (score 75), near the top of the C band. This certificate was lodged in the last six months, so the rating reflects current condition.
Held since October 1997 — that's 29 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. At 150 m² the property is well over the postcode median (106 m² across 7 EPCs), placing it in the larger end of the local stock. Its energy rating outperforms most of the postcode (better than 86% of similar EPCs). Today's modelled estimate of £616,000 sits 486.7% above the 1997 sale of £105,000. On a £-per-square-foot basis, the last sale (£65/sq ft) was about 77.9% below the postcode norm.
Before you decide
Everything you need to know about 21 Duffryn Avenue
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The data behind every report
Energy performance
Every EPC certificate filed against this property — current rating, recorded improvements, and where there's headroom to reach a higher band.
The EPC has just been inspected, so the rating reflects current condition.
Current Certificate
Jun 2026EPC Rating
A
B
C
C75
D
E
F
G
Main Heating
Gas
Main Fuel
Gas
Hot Water
Good
Windows
Average
CO2 Emissions
3.5 t/year
Occupancy
Owner Occupied
Certificate validity
Valid until 1 June 2036
Planning history
Applications and permits filed against 21 Duffryn Avenue, Cardiff, CF23 6LE, sourced from the PlanIt planning register.
21 Duffryn Avenue has no planning applications on record.
1
But the area is active
1 notable application nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Versus other Duffryn Avenue homes
Four headline reads against 7 similar houses on this street, drawn from the latest EPC and Land Registry data.
On price per m², 21 Duffryn Avenue runs well behind the street norm.
Price per m²
£700
Street avg £3,341
Floor Area
150 m²
Street avg 139 m²
Habitable Rooms
8 rooms
Street avg 6 rooms
CO₂ Emissions
3.5 t/year
Street avg 5.9 t/year
The neighbourhood at a glance
A condensed read of the local area. Each tile links through to the full breakdown on the Cardiff district page.
Rail-style transport is unusually close for this postcode.
Crime
169/mo
Falling year-on-year across the wider district.
Nearest stop
0.1 km
Duffryn Avenue — bus stop.
Nearest stops
- Duffryn AvenueBus stop136m
- Nant Fawr CrescentBus stop157m
- Celyn AvenueBus stop187m
- Llandennis AveBus stop228m
Most reported crime locally
- Violence & Sexual Offences995 reports33%
- Anti-social Behaviour345 reports11%
- Public Order344 reports11%
- Shoplifting340 reports11%
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.
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Late 20th centurySemi-Detached HouseEPC C
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Similar properties nearby
A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
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Explore sale histories, valuations, energy ratings and local areas. Ask the assistant to connect the details and take your research further.
Start your researchHow to read this page
Where every figure above comes from, how current it is and what it can't tell you.
- How the estimate is made
- The estimate for 21 Duffryn Avenue is modelled from its 150 m² EPC floor area, its 1 recorded sale and recent sales of comparable homes in CF23 6LE. It is an automated estimate, not a survey or mortgage valuation: condition, layout and improvements that aren't on record can move the real figure either way.
- Where sold prices come from
- Sold prices are HM Land Registry Price Paid Data, which covers residential sales in England and Wales since 1995. 1 sale is recorded for 21 Duffryn Avenue. Sales normally appear two to three months after completion, so the most recent ones take time to show up anywhere.
- Reading the EPC
- Energy Performance Certificates rate homes from A (most efficient) to G and last 10 years. The latest one for 21 Duffryn Avenue was lodged in June 2026 at band C and is valid until June 2036. Floor area, heating and insulation details on this page come from it.
- Planning records
- Planning applications are collected from local authority registers through PlanIt. None is matched to 21 Duffryn Avenue. Councils sometimes file applications under a different address format, and applications on neighbouring land aren't listed here; the report covers both.
- Area figures
- Crime is police-recorded street-level data over the last 18 months, which places each incident at an approximate point. Schools and stops are measured in a straight line from CF23 6LE.
- Council tax band
- 21 Duffryn Avenue is in council tax band F. Bands are set by the Valuation Office Agency from historic values (1 April 1991 in England, 1 April 2003 in Wales), not today's price; the amount you pay depends on the council's rate for the band.
Common questions
The questions buyers, sellers and homeowners most often ask about 21 Duffryn Avenue, Cardiff, CF23 6LE. Each answer is also embedded as structured data for search engines.
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Keep exploring
- Every home in CF23 6LESold prices, values and energy ratings for the postcode
- CF 23 property marketPrices, postcodes, schools and transport across the district
- 21 Duffryn Avenue, Cardiff valuationHow the estimate is built and what moves it
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