What type of property is 21 Duncan Close, CF3 1NP?

21 Duncan Close, CF3 1NP is a 2-bedroom semi-detached house.

What did 21 Duncan Close, CF3 1NP sell for?

21 Duncan Close, CF3 1NP last sold for £166,000 in April 2021, around 5 years ago. Land Registry has 6 sales on record going back to £64,950 in July 2002. Source: HM Land Registry.

What is the price history for 21 Duncan Close, CF3 1NP?

Across 6 sales between July 2002 and April 2021, 21 Duncan Close, CF3 1NP rose from £64,950 to £166,000, a change of £101,050. That works out to roughly +5.1% per year compounded over 19 years. Source: HM Land Registry.

How energy efficient is 21 Duncan Close, CF3 1NP?

The current EPC rating for 21 Duncan Close, CF3 1NP is C with a score of 74 out of 100, lodged in December 2020. The assessor estimates the property could reach a B. Source: EPC Register.

What is the floor area of 21 Duncan Close, CF3 1NP?

21 Duncan Close, CF3 1NP has a recorded floor area of 56 m² (603 sq ft), around 28 m² per bedroom. That makes it about 18% smaller than the median EPC-recorded property in CF3 1NP. Source: EPC Register.

How is 21 Duncan Close, CF3 1NP heated?

The latest EPC at 21 Duncan Close, CF3 1NP records mains gas as the main heating fuel. Source: EPC Register.

What council tax band is 21 Duncan Close, CF3 1NP?

21 Duncan Close, CF3 1NP is in council tax band C.

Where is 21 Duncan Close, CF3 1NP located?

21 Duncan Close, CF3 1NP sits in St. Mellons, Cardiff, Cardiff. It falls within the CF3 postcode district.

How safe is the area around 21 Duncan Close, CF3 1NP?

Police records around 21 Duncan Close, CF3 1NP show an average of 242 reported crimes per month over the last 18 months. Violent crime makes up roughly 36% of reports, the most common category. The overall trend is falling (22% versus the prior period). Source: Police UK.

What transport links are near 21 Duncan Close, CF3 1NP?

The closest bus stop to 21 Duncan Close, CF3 1NP is Ty Coch Court, 88m away. In total there are 30 bus stops within the surrounding area.

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21 Duncan Close, St Mellons, Cardiff, CF3 1NP

6 sales on record

Estimated value

£213,000

Since the 2021 sale (£166,000)+28%
Against CF3 1NP's recent median (£245,000)-13%

Newest record on this page: October 2025. Land Registry and EPC registers update monthly, so this page can trail them by 2–3 months.

Learn about this valuation

Property type

Semi-detached

Bedrooms

Bathroom

Floor area

56 m²

603 sq ft

Energy rating

Score 74

Council tax

Band C

Tenure

Owner Occupied

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Valuation

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

£213,000

Against its 2021 sale (£166,000)+28%
Against CF3 1NP's recent median (£245,000)-13%

Your note and figure are shown publicly on this page.

How the estimate is made

The estimate for 21 Duncan Close is modelled from its 56 m² EPC floor area, its 6 recorded sales and recent sales of comparable homes in CF3 1NP. 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
56 m² from the EPC lodged in December 2020
Sales of this home
6 sales recorded, the latest in 2021
Recent sales in CF3 1NP
5 sales, median £245,000 (2025–2024)

This page or the full report?

Data	This page	Full report
Sales	Latest sale shown: October 2025	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

Price

Sales history & valuation

Every recorded sale of this home, how its price has moved, and what neighbouring properties have sold for.

21 Duncan Close has more than doubled in price since the earliest registered sale in 2002.

Sales timeline

7 April 2021Most recent
£166,000
+22.1%over 5 years
9 July 2015
£136,000
+8.8%over 1 year
22 January 2014
£124,950
21 June 2007
£124,950
+36.6%over 2 years
22 February 2005
£91,500
+40.9%over 2 years
11 July 2002
£64,950

Median price across the last 5 sales in CF3 1NP: £245,000 (2025–2024).

Nearby sales in CF3 1NP

Risks

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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Overview

About 21 Duncan Close

A plain-English summary derived from public records, EPC certificates, sold prices and local data.

21 Duncan Close is a two-bedroom semi-detached house in St. Mellons, Cardiff, Cardiff (CF3 1NP). It has a recorded floor area of 56 m² (around 603 sq ft), construction records dating it to 1983-1990 and council tax band C. The latest certificate (December 2020) shows a C (score 74). The rating has held steady at C across 2 certificates since August 2010. Between certificates, lighting went from Poor to Very Good. The recommended improvements would push it to B (score 90).

Most recent transfer: April 2021 at £166,000. Across the public record there are 6 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. Across 2002–2021, sale prices on this property compounded at 5.1% per year. Today's modelled estimate of £213,000 is 28.3% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£275/sq ft) was about 42.5% above the typical sold price in the postcode. At 56 m² it's 17.6% smaller than the typical home in the postcode (68 m² median across 17 EPCs).

Specifications

What this property has

Pulled from EPC certificates, claim submissions and our property model. Empty categories are hidden — we only show what's known.

Inside

Bedrooms2
Bathrooms1

Outside

ParkingAllocated

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Energy

Energy performance

Every EPC certificate filed against this property — current rating, recorded improvements, and where there's headroom to reach a higher band.

Current Certificate(1 of 2)

Dec 2020

EPC Rating

C74

Main Heating

Gas

Main Fuel

Gas

Hot Water

Good

Windows

Good

CO2 Emissions

1.8 t/year

Occupancy

Owner Occupied

Certificate validity

Valid until 10 December 2030

4 years remaining

Property Improvements

Changes detected from historical EPC data

Dec 2020from Aug 2010

Heating Controls

Prog + StatFull

Heating controls upgraded for better temperature management

Low Energy Lighting

17%100%

More low energy lighting installed

Planning

Planning history

Applications and permits filed against 21 Duncan Close, St Mellons, Cardiff, CF3 1NP, sourced from the PlanIt planning register.

21 Duncan Close has no planning applications on record.

A planning report still maps activity across the surrounding area and reads this property's extension & conversion potential.

On the street

Versus other Duncan Close homes

Four headline reads against 17 similar houses on this street, drawn from the latest EPC and Land Registry data.

Floor Area for 21 Duncan Close lags the street by a wide margin.

Price per m²

£2,964

Street avg £2,816

Above

Floor Area

56 m²

Street avg 66 m²

Strongly below

Habitable Rooms

3 rooms

Street avg 4 rooms

Strongly below

CO₂ Emissions

1.8 t/year

Street avg 2.2 t/year

Above

Area

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.

Full Cardiff report

Crime

242/mo

Falling year-on-year across the wider district.

Nearest stop

0.1 km

Ty Coch Court — bus stop.

Nearest stops

Ty Coch CourtBus stop88m
The MountBus stop101m
Hendre RoadBus stop117m
Menai WayBus stop184m

Most reported crime locally

Violence & Sexual Offences1,550 reports36%
Anti-social Behaviour627 reports14%
Public Order468 reports11%
Criminal Damage & Arson424 reports10%

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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Comparables

Similar properties nearby

A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.

£205k

1 Canopus Close, St Mellons

CF3 1NR

2 bed1 bath

£213k

1 Abergele Road, Rumney

CF3 1RR

3 bed1 bath

£203k

1 Dovey Close, Rumney

CF3 1RJ

3 bed

£246k

1 Meadvale Court, Meadvale Road

CF3 1UG

3 bed2 bath

£256k

1 Duncan Close, St Mellons

CF3 1NP

3 bed1 bath

£215k

1 Llanina Grove, Rumney

CF3 1SW

4 bed

£213k

1 Heol Newydd

CF3 1DW

£214k

1 Meadvale Road

CF3 1UF

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Method

How to read this page

Where every figure above comes from, how current it is and what it can't tell you.

Valuation method in detail

How the estimate is made: The estimate for 21 Duncan Close is modelled from its 56 m² EPC floor area, its 6 recorded sales and recent sales of comparable homes in CF3 1NP. 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. 6 sales are recorded for 21 Duncan Close. 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 Duncan Close was lodged in December 2020 at band C and is valid until December 2030. 2 certificates are on record, which shows how the home has changed.
Planning records: Planning applications are collected from local authority registers through PlanIt. None is matched to 21 Duncan Close. 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 CF3 1NP.
Council tax band: 21 Duncan Close is in council tax band C. 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.

FAQ

Common questions

The questions buyers, sellers and homeowners most often ask about 21 Duncan Close, St Mellons, Cardiff, CF3 1NP. Each answer is also embedded as structured data for search engines.

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