What type of property is 21 William Street, SA9 1AT?

21 William Street, SA9 1AT is a 3-bedroom mid-terrace house.

When did 21 William Street, SA9 1AT last change hands?

21 William Street, SA9 1AT last sold for £73,000 in July 2015, around 11 years ago. Source: HM Land Registry.

What is the EPC rating for 21 William Street, SA9 1AT?

The current EPC rating for 21 William Street, SA9 1AT is D with a score of 66 out of 100, lodged in October 2014. The assessor estimates the property could reach a B. Source: EPC Register.

What is the floor area of 21 William Street, SA9 1AT?

21 William Street, SA9 1AT has a recorded floor area of 73 m² (786 sq ft), around 24 m² per bedroom. That makes it about 14% smaller than the median EPC-recorded property in SA9 1AT. Source: EPC Register.

How is 21 William Street, SA9 1AT heated?

The latest EPC at 21 William Street, SA9 1AT records mains gas as the main heating fuel. Source: EPC Register.

What council tax band is 21 William Street, SA9 1AT?

21 William Street, SA9 1AT is in council tax band B. That sits at the lower end of the A-H ladder, typically reflecting smaller floor areas or lower 1991 valuations.

Where is 21 William Street, SA9 1AT located?

21 William Street, SA9 1AT sits in Ystradgynlais, Swansea, Swansea. It falls within the SA9 postcode district.

How safe is the area around 21 William Street, SA9 1AT?

Police records around 21 William Street, SA9 1AT show an average of 6 reported crimes per month over the last 9 months. Violent crime makes up roughly 72% of reports, the most common category. The overall trend is broadly stable. Source: Police UK.

What transport links are near 21 William Street, SA9 1AT?

The closest bus stop to 21 William Street, SA9 1AT is Glanrhyd Hospital, 80m away. In total there are 30 bus stops within the surrounding area.

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21 William Street, Ystradgynlais, Swansea, SA9 1AT

Property type

Mid terrace

Bedrooms

Bathrooms

Floor area

73 m²

786 sq ft

Energy rating

Score 66

Council tax

Band B

Tenure

Owner Occupied

Overview

About 21 William Street

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

21 William Street is a three-bedroom mid-terrace house in Ystradgynlais, Swansea, Swansea (SA9 1AT). It has a recorded floor area of 73 m² (around 786 sq ft), construction records dating it to 1900-1929 and council tax band B. The latest certificate (October 2014) shows a D (score 66), on the cusp of jumping into the C band. The recommended improvements would lift it to B (score 87), a 2-band jump. The latest certificate is from October 2014, so improvements made since then won't be reflected.

Today's modelled estimate of £166,000 sits 127.4% above the 2015 sale of £73,000. On the market in July 2015 and unlisted since — roughly 11 years.

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Valuation

against the asking price

Risks

planning & flood

Sold prices

similar homes nearby

Trends

the local market

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

Bedrooms3
Bathrooms2
Dining roomYes
Utility roomYes
EnsuiteYes

Outside

Private gardenrear

Building

Central heatingYes

Energy

Energy performance

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

Recommended upgrades on file would lift this property by multiple EPC bands.

EPC Expired

This certificate is over 10 years old and is no longer valid.Expired 16 Oct 2024

EPC Rating

D66

Main Heating

Gas

Main Fuel

Gas

Hot Water

Good

Windows

Good

CO2 Emissions

2.8 t/year

Occupancy

Owner Occupied

Planning

Planning history

Applications and permits filed against 21 William Street, Ystradgynlais, Swansea, SA9 1AT, sourced from the PlanIt planning register.

21 William Street has no planning applications on record.

Notable planning nearby

2applications of note in the surrounding area

Before you offer

We flagged 1 thing worth checking at 21 William 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.

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Price

Sales history & valuation

Recorded transactions, our model's current estimate, and a quick read on what neighbouring properties have sold for.

21 William Street valuation sits well clear of the typical sold price in this postcode.

Current estimate

£166,000

Modelled from EPC, postcode comparables.

See how we calculated this

Last sold (2015)

£73,000

Recorded with HM Land Registry.

Sales timeline

30 July 2015Most recent
£73,000

Median price across the last 5 sales in SA9 1AT: £127,000 (2025–2019).

Nearby sales in SA9 1AT

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Everything we know about 21 William 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

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On the street

Versus other William Street homes

Four headline reads against 13 similar houses on this street, drawn from the latest EPC and Land Registry data.

21 William Street outperforms the street on co₂ emissions by a wide margin.

Price per m²

£1,000

Street avg £1,107

On par

Floor Area

73 m²

Street avg 89 m²

Strongly below

Habitable Rooms

3 rooms

Street avg 5 rooms

Strongly below

CO₂ Emissions

2.8 t/year

Street avg 5.0 t/year

Strongly above

Comparables

Similar properties nearby

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

£188k

1 Caehopkin Cottage, Caehopkin Road, Abercrave

SA9 1TX

3 bed1 bath

£240k

1 2 Metz Cottages, Ystradgynlais

SA9 1SB

3 bed1 bath

£248k

1 Abercrave Villas, Heol Tawe, Abercrave

SA9 1TN

3 bed

£256k

1 Brynygroes Cottages, Ystradgynlais

SA9 1LE

3 bed

£272k

1 Brynawel Villas, Brecon Road, Ystradgynlais

SA9 1HQ

3 bed

£164k

1 Brooklands Terrace, Abercrave

SA9 1UF

2 bed

£154k

1 Brewers Cottage, Pelican Street, Ystradgynlais

SA9 1LG

2 bed

£194k

1 Coedlan, Lower Cwmtwrch

SA9 1ED

4 bed

Area

The neighbourhood at a glance

A condensed read of the local area. Each tile links through to the full breakdown on the Swansea district page.

Full Swansea report

Crime

6/mo

Steady year-on-year across the wider district.

Nearest stop

0.1 km

Glanrhyd Hospital — bus stop.

Go deeper on the local area

The full report breaks down crime, transport links, schools and air quality in depth.

Map

Everything within walking distance

Schools, transport stops and scenic spots near this property — 30 points of interest in total.

FAQ

Common questions

The questions buyers, sellers and homeowners most often ask about 21 William Street, Ystradgynlais, Swansea, SA9 1AT. Each answer is also embedded as structured data for search engines.