What kind of home is 15 William Street, SA9 1AT?

15 William Street, SA9 1AT is a 3-bedroom end-of-terrace house.

What did 15 William Street, SA9 1AT sell for?

15 William Street, SA9 1AT last sold for £127,000 in March 2021, around 5 years ago. Land Registry has 3 sales on record going back to £115,000 in September 2007. Source: HM Land Registry.

What is the price history for 15 William Street, SA9 1AT?

Across 3 sales between September 2007 and March 2021, 15 William Street, SA9 1AT rose from £115,000 to £127,000, a change of £12,000. That works out to roughly +0.7% per year compounded over 14 years. Source: HM Land Registry.

What energy rating does 15 William Street, SA9 1AT have?

The current EPC rating for 15 William Street, SA9 1AT is D with a score of 56 out of 100, lodged in September 2011. Source: EPC Register.

How big is 15 William Street, SA9 1AT?

15 William Street, SA9 1AT has a recorded floor area of 81 m² (876 sq ft), around 27 m² per bedroom. Source: EPC Register.

What heating system does 15 William Street, SA9 1AT use?

The latest EPC at 15 William Street, SA9 1AT records mains gas as the main heating fuel. Source: EPC Register.

What is the council tax band for 15 William Street, SA9 1AT?

15 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.

Which area is 15 William Street, SA9 1AT in?

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

How safe is the area around 15 William Street, SA9 1AT?

Police records around 15 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.

How well connected is 15 William Street, SA9 1AT?

The closest bus stop to 15 William Street, SA9 1AT is Glanrhyd Hospital, 80m away. In total there are 30 bus stops within the surrounding area.

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15 William Street, Ystradgynlais, Swansea, SA9 1AT

3 sales on record

Property type

End terrace

Bedrooms

Bathroom

Floor area

81 m²

876 sq ft

Energy rating

Score 56

Council tax

Band B

Tenure

Owner Occupied

Overview

About 15 William Street

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

15 William Street is a three-bedroom end-of-terrace house in Ystradgynlais, Swansea, Swansea (SA9 1AT). It has a recorded floor area of 81 m² (around 876 sq ft), construction records dating it to 1900-1929 and council tax band B. The latest certificate (September 2011) shows a D (score 56), a step below the typical UK home. The latest certificate is from September 2011, so improvements made since then won't be reflected.

Across 2007–2021, sale prices on this property compounded at 0.7% per year. Today's modelled estimate of £164,000 is 29.1% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£145/sq ft) was about 62.5% above the typical sold price in the postcode. Most recent transfer: March 2021 at £127,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.

Before you offer

Know exactly what you're buying at 15 William Street

Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.

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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
Bathrooms1
StudyYes

Building

Heating systemgas

Energy

Energy performance

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

15 William Street's EPC is over a decade old — improvements since won't be reflected.

EPC Expired

This certificate is over 10 years old and is no longer valid.Expired 27 Sept 2021

EPC Rating

D56

Main Heating

Gas

Main Fuel

Gas

Hot Water

Good

Windows

Poor

CO2 Emissions

4.6 t/year

Occupancy

Owner Occupied

Planning

Planning history

Applications and permits filed against 15 William Street, Ystradgynlais, Swansea, SA9 1AT, sourced from the PlanIt planning register.

15 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 15 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.

15 William Street changed hands twice within eighteen months — unusual for the area.

Current estimate

£164,000

Modelled from EPC, postcode comparables and a sale-price growth of 0.7% per year over 14 years.

See how we calculated this

Last sold (2021)

£127,000

Growth on file: 0.7% per year over 14 years.

Sales timeline

26 March 2021Most recent
£127,000
+4.5%over 1 year
14 February 2020
£121,500
+5.7%over 12 years
6 September 2007
£115,000

Median price across the last 5 sales in SA9 1AT: £190,000 (2025–2018).

Nearby sales in SA9 1AT

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Everything we know about 15 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.

15 William Street outperforms the street on price per m² by a wide margin.

Price per m²

£1,561

Street avg £1,060

Strongly above

Floor Area

81 m²

Street avg 88 m²

Below

Habitable Rooms

4 rooms

Street avg 5 rooms

Below

CO₂ Emissions

4.6 t/year

Street avg 4.9 t/year

On par

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 15 William Street, Ystradgynlais, Swansea, SA9 1AT. Each answer is also embedded as structured data for search engines.