Sold End of terrace

21 CASTLE STREET

SWANSEA, MUMBLES, SWANSEA SA3 4BH

2 beds 1 baths 1,012 sq ft Listed 11 Feb 2026 (-126d)

£450,000

Save

19-P1153766.jpg Lounge/Dining Room Rear Sitting Room Lounge/Dining Room Lounge/Dining Room Lounge/Dining Room Kitchen Kitchen Cloakroom Sitting Room Landing Bedroom One Bedroom One Bedroom Two Bedroom Two Attic Room Attic Room Bathroom Bathroom Front Rear Rear Outbuilding Outbuilding Outbuilding Aerial Aspect

/ 27

Property details

Tenure

FREEHOLD

Floor area

94 m²

Council tax band

D

EPC rating

E

Year built

England and Wales: 1900-1929

Last sold

£274,000 Mar 2021

Price per m²

£4,787/m²

Local average

£274,533 (+63.9%)

Street crime

61 incidents within 1 mile (Apr 2026)

Key features

  • TWO BEDROOM (WITH ATTIC ROOM) END TERRACE
  • LOCATED IN THE HEART OF THE EVER POPULAR VILLAGE OF MUMBLES
  • VIEWS OF OYSTERMOUTH CASTLE TO THE REAR
  • PRIVATE PARKING
  • SOLD WITH NO CHAIN
  • WELL PRESENTED THROUGHOUT
  • PLOT SIZE OF 0.05 ACRES
  • FLOOR AREA OF 1003 FT2
  • MUST BE SEEN
  • EER RATING - E

Additional details

Parking
Yes
Garden
Yes

Description

Located in the heart of the highly sought-after village of Mumbles, this beautifully renovated end-of-terrace property offers stylish and contemporary living across three floors. Finished to an exceptional standard throughout and being sold with no onward chain, this charming home blends character and modern convenience in equal measure.

The accommodation on the ground floor comprises a welcoming cloakroom, a spacious lounge and dining area perfect for entertaining, a modern kitchen, and a bright and airy sitting room. The first floor features a luxurious bathroom suite and two well-appointed bedrooms, with the second currently arranged as a dressing room. A further staircase leads to a versatile attic room on the top floor, presently used as a home office, ideal for remote working or as a creative space.

The rear of the property enjoys beautiful views of the historic Oystermouth Castle and boasts a low-maintenance garden designed for year-round enjoyment. A resin seating area provides ample space for outdoor dining, complemented by AstroTurf-style flooring for ease of upkeep. Beyond the garden, private electric gates lead to off-road parking and a detached outbuilding. This additional space, equipped with Sky and broadband, is currently used as a peaceful relaxation room but offers a range of potential uses.

Occupying a plot of approximately 0.05 acres and with a floor area of 1003 sq ft, this exceptional home offers privacy, comfort, and a prime location just moments from the seafront, boutiques, and vibrant cafes of Mumbles village.

Entrance - Via a composite door into the open plan lounge/dining room.

Lounge/Dining Room - 6.973 x 4.191 (22'10" x 13'8" ) - With stairs to the first floor. Double glazed bay window to the front with a set of double glazed PVC doors leading out to the front. Set of frosted double glazed windows to the side. Two feature gas fires set in fireplace. Opening to the kitchen. Two radiators. Spotlights.

Lounge/Dining Room -

Lounge/Dining Room -

Lounge/Dining Room -

Kitchen - 2.113 x 3.133 (6'11" x 10'3" ) - A beautifully appointed kitchen fitted with a range of base and wall units. Running marble work surface incorporating a five ring gas hob with oven and grill under. Extractor hood over. Integral Neff microwave. Integral wine cooler. Integral dishwasher. Integral fridge. Integral freezer. Spotlights. Stainless steel sink and drainer unit with contemporary mixer tap over. Food waste disposal. Opening to the sitting room. Door to the cloakroom.

Kitchen -

Cloakroom - 2.364 x 1.141 (7'9" x 3'8" ) - Beautifully appointed with a Velux roof window to the side. Radiator. Doors to built-in storage. WC. Wash hand basin. Heated towel rail. Spotlights.

Sitting Room - 2.696 x 3.279 (8'10" x 10'9" ) - With a set of bifold doors to the rear garden. Feature gas fire set on the wall. Spotlights.

Sitting Room -

First Floor -

Landing - Door to the bathroom. Doors to bedrooms. Door with stairs leading up to the attic room.

Bathroom - 3.173 x 2.278 (10'4" x 7'5" ) - Well appointed bathroom suite with a double glazed window to the rear offering a pleasant outlook of Oystermouth Castle. Suite comprising a bathtub with shower over. Corner steam shower cubicle. WC. Wash hand basin. Spotlights. Extractor fan. Heated towel rail.

Bathroom -

Bedroom One - 3.331 x 3.153 (10'11" x 10'4" ) - With a set of double glazed PVC doors to the front Juliet balcony. Radiator. Spotlights. Doors to built-in wardrobes.

Bedroom One -

Bedroom Two - 3.465 x 1.909 (11'4" x 6'3" ) - Currently being used as a dressing room. With a set of double glazed doors to the rear. Wall mounted radiator. Doors to built-in wardrobes.

Bedroom Two -

Second Floor -

Attic Room - 3.667 x 3.876 (12'0" x 12'8" ) - Velux roof window to the rear.

Attic Room -

External -

Front - You have a courtyard garden with resin flooring.

Aerial Aspect -

Rear - Low maintenance which comprises of a resin seating area with ample room for tables and chairs which in turn has a AstroTurf style flooring. You also have private electric gates providing access to the parking. Detached outbuilding (with Sky & broadband) currently being used as a relaxation room.

Rear -

Rear -

Outbuilding - 3.477x 1.727 (11'4"x 5'7" ) -

Outbuilding -

Outbuilding -

Services - Mains electric. Mains sewerage. Mains water. Mains gas. Broadband type - full fibre. Mobile phone coverage available with EE, O2 Three & Vodafone.

Council Tax Band - Council Tax Band - D

Tenure - Freehold.

Listed by

Mumbles

Astley Residential Limited

Reference: 172077806

EPC Rating & Upgrade Cost

Current rating: E

Potential rating: B

Inspection date: 24/02/2025

Expiry date: 23/02/2035

Est. upgrade cost to C: £27,775

Recommendations

  • Flat roof or sloping ceiling insulation (£850 - £1,500)
  • Room-in-roof insulation (£1,500 - £2,700)
  • Cavity wall insulation (£500 - £1,500)
  • 50 mm internal or external wall insulation (£4,000 - £14,000)
  • Floor insulation (solid floor) (£4,000 - £6,000)
  • Solar water heating (£4,000 - £6,000)
  • Solar photovoltaic panels, 2.5 kWp (£3,500 - £5,500)

View full EPC on gov.uk

Flood risk

Zone: 1

Risk: Low

Job (default Low)

Floorplans

Floorplan.jpg

Floorplan.jpg

EPC Graphs

EE Rating

EE Rating

FENSA Certificates

This property has 1 FENSA certificate(s) on record, indicating window/door installations by FENSA-approved installers.

FENSA Certificate #1038013

Property Details

Street: 21 Castle Street

Town: Mumbles

Postcode: SA3 4BH

Installation Details

Items: 7 windows and 1 door

Certificate Issued: 03/10/2003

Work Completed: 08/09/2003

This certificate data was retrieved from FENSA's database

What is FENSA? FENSA (Fenestration Self-Assessment Scheme) is a government-authorised scheme that monitors building regulation compliance for replacement windows and doors. Certificates indicate that work was completed by FENSA-approved installers.

Price history

454% since 1996

Event Date Price % change
Sold 26/03/2021 (5 years ago) £274,000 +46.1%
Sold 17/08/2012 (13 years ago) £187,500 +6.2%
Sold 24/06/2005 (20 years ago) £176,500 +256.6%
Sold 23/12/1996 (29 years ago) £49,500

Source: HM Land Registry Price Paid Data. Crown copyright.

Sold Comparables

Same street and nearby sales within 0.25 miles (last 5 years). Data from Land Registry Price Paid.

Address Price Date Type
12 CASTLE SQUARE, MUMBLES, SWANSEA, SA3 4BJ £208,000 21/11/2025 Terraced
Same street 16 CASTLE STREET, MUMBLES, SWANSEA, SA3 4BH £260,000 31/10/2025 Terraced
11 KINGS ROAD, MUMBLES, SWANSEA, SA3 4AJ £280,000 23/07/2025 Terraced
23 OAKLAND ROAD, MUMBLES, SWANSEA, SA3 4AQ £456,500 18/03/2025 Terraced
Same street 14 CASTLE STREET, MUMBLES, SWANSEA, SA3 4BH £387,500 12/02/2024 Terraced
6 CHAPEL STREET, MUMBLES, SWANSEA, SA3 4NH £340,000 09/10/2023 Terraced
Same street 11 CASTLE STREET, MUMBLES, SWANSEA, SA3 4BH £325,000 27/09/2023 Terraced
4 GOWER PLACE, MUMBLES, SWANSEA, SA3 4AB £271,000 20/09/2023 Terraced
8 QUEENS ROAD, MUMBLES, SWANSEA, SA3 4AN £280,000 16/08/2023 Terraced
4 VICTORIA AVENUE, MUMBLES, SWANSEA, SA3 4NQ £285,000 04/08/2023 Terraced
15 QUEENS ROAD, MUMBLES, SWANSEA, SA3 4AW £240,000 27/04/2023 Terraced
22 CHAPEL STREET, MUMBLES, SWANSEA, SA3 4NH £461,000 28/11/2022 Terraced
57 NEWTON ROAD, MUMBLES, SWANSEA, SA3 4BL £325,000 25/11/2022 Terraced
14 GOWER PLACE, MUMBLES, SWANSEA, SA3 4AB £392,500 14/11/2022 Terraced
3 CASTLE SQUARE, MUMBLES, SWANSEA, SA3 4BJ £290,000 28/10/2022 Terraced
3 OAKLAND ROAD, MUMBLES, SWANSEA, SA3 4AQ £396,000 06/10/2022 Terraced
8 DUNNS LANE, MUMBLES, SWANSEA, SA3 4AA £300,000 22/09/2022 Terraced
Same street 2 CASTLE STREET, MUMBLES, SWANSEA, SA3 4BH £341,000 13/09/2022 Terraced
7 OAKLAND ROAD, MUMBLES, SWANSEA, SA3 4AQ £447,756 16/08/2022 Terraced
20 WOODVILLE ROAD, MUMBLES, SWANSEA, SA3 4AD £345,000 12/08/2022 Terraced
114 CASTLE ROAD, MUMBLES, SWANSEA, SA3 5TA £480,000 10/08/2022 Terraced
35 LANGLAND ROAD, MUMBLES, SWANSEA, SA3 4LX £455,000 29/07/2022 Terraced
43 GLOUCESTER PLACE, MUMBLES, SWANSEA, SA3 4LF £95,000 23/06/2022 Terraced
22 VICTORIA AVENUE, MUMBLES, SWANSEA, SA3 4NG £330,000 07/06/2022 Terraced

Street average: £328,375 (4 sales)

Area average: £333,888 (20 sales)

Capital growth trend

Land Registry outcode average: last 12 months vs 5y and 10y ago (from sold prices).

5y growth -37%
10y growth 9.4%

House Price Index (HM Land Registry — official index, not sold-price averages): Swansea. Series: Terraced. As of March 2026.

1y (index) 1.9%
5y (index) 26.7%
10y (index) 58.9%

Rental Range

Estimated market rent for Swansea. Low = conservative, Realistic = average, Optimistic = best case.

Low £752/mo
Realistic £835/mo
Optimistic £919/mo

Based on Local Authority from postcode lookup → Swansea.

Location

Nearby

Nearest stations, universities and amenities (distance from property).

Type Name Distance
Shop ROCO Mumbles 0.0 miles
Shop Oyster Gallery 0.0 miles
Bus stop Oystermouth Primary School 0.0 miles
Bus stop Underhill Park 0.1 miles
Hospital Gower Physiotherapy Clinic 1.8 miles
University Swansea University 4.0 miles
Train station Swansea 4.4 miles
Train station Gowerton 5.2 miles

Street-level crime

Category Count
Violence and sexual offences 22
Anti-social behaviour 10
Public order 9
Criminal damage and arson 6
Other theft 5
Vehicle crime 3
Shoplifting 2
Bicycle theft 1
Burglary 1
Drugs 1
Other crime 1
Total incidents 61

Within 1 mile during Apr 2026. Source: data.police.uk (England & Wales).

Schools nearby

Nearest open schools with Ofsted ratings (England). Closed schools are not shown. Data from Get Information about Schools and Ofsted.

Name Type Distance Ofsted
Oystermouth Primary School Other 0.0 miles (No rating)
Newton Primary School Other 0.5 miles (No rating)
Grange Primary School Other 0.5 miles (No rating)
St David's Catholic Primary School Other 0.5 miles (No rating)
Y.G.G. Llwynderw Other 0.6 miles (No rating)

Rental Comparables

Residential lets from OpenRent and Rightmove for the area (same bedroom count). Use to validate rent estimates. Student lets are excluded.

Title Rent Beds Distance As seen on
2 Bed Terraced House, Castle Square, SA3 £1,200/mo 2 0.02 miles OpenRent
2 Bed Penthouse, Newton Road, SA3 £1,000/mo 2 0.06 miles OpenRent
2 Bed Flat, Oystermouth Court, SA3 £995/mo 2 0.18 miles OpenRent
2 Bed Flat, Parkside, SA3 £975/mo 2 0.22 miles OpenRent
2 Bed Terraced House, Park Street, SA3 £2,600/mo 2 0.27 miles OpenRent
2 Bed Maisonette, Mumbles Road, SA3 £1,200/mo 2 0.45 miles OpenRent
2 Bed Terraced House, Hatherleigh Drive, SA3 £995/mo 2 0.52 miles OpenRent
2 Bed Flat, Langland, SA3 £960/mo 2 0.55 miles OpenRent

Average rent: £1,241/mo (8 listings)

Rent-driven metrics

Based on OpenRent comparables.

Rent ratio 0.22%
Max investor price (0.8%) £124,750
Target investor price (1%) £99,800
Gross yield 2.7%
Cost-to-rent ratio 37.6×
Monthly cashflow £-899/mo 75% LTV, 3.95% APR (5yr fixed), 25yr term
Cash-on-cash ROI -8.3%
  • Rent ratio — Monthly rent ÷ purchase price (1% rule). 1%+ = strong, 0.8–1% = okay, <0.8% = weak for cashflow.
  • Max investor price — Rent ÷ 0.8%; the price at which rent would be 0.8% of price (Stoke-style target).
  • Target investor price — Rent ÷ 1%; the price at which rent would be 1% of price (strong cashflow band).
  • Gross yield — Annual rent as % of purchase price (no costs).
  • Cost-to-rent — Price ÷ annual rent (from OpenRent comparables). Under 14× = strong, 14–16× = acceptable, 17×+ = compressed.
  • Cashflow — Rent minus mortgage, 10% maintenance, £25/mo compliance. Assumes 75% LTV, 3.95% APR (5yr fixed), 25yr term.
  • ROI — Annual profit ÷ cash in (deposit + 4% purchase costs).