21 CASTLE STREET
SWANSEA, MUMBLES, SWANSEA SA3 4BH
£450,000
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
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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
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)
Flood risk
Zone: 1
Risk: Low
Job (default Low)
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).
House Price Index (HM Land Registry — official index, not sold-price averages): Swansea. Series: Terraced. As of March 2026.
Rental Range
Estimated market rent for Swansea. Low = conservative, Realistic = average, Optimistic = best case.
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 — 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).