Model valuation£417,0008 Busby Close
Local market context
12 Gelli Street, Port Tennant, Swansea, SA1 8NJ
Property type
Mid terrace
Floor Ground
Habitable rooms
2
From EPC
Floor area
43 m²
463 sq ft
Energy rating
D
Score 62
Council tax
Band A
Tenure
Private Rental
About 12 Gelli Street
A plain-English summary derived from public records, EPC certificates, sold prices and local data.
12 Gelli Street is a mid-terrace house in Port Tennant, Swansea, Swansea (SA1 8NJ). It has a recorded floor area of 43 m² (around 463 sq ft), construction records dating it to 1900-1929 and council tax band A. At 43 m² this is the smallest unit on EPC record across the building (43–106 m²). The building's EPC ratings span E to C across 38 units on file. The latest certificate (August 2020) shows a D (score 62), on the cusp of jumping into the C band. The rating has held steady at D across 4 certificates since June 2010. Between certificates, window efficiency went from Very Poor to Average. The recommended improvements would push it to C (score 74).
At 43 m² it sits well below the postcode median (81 m² across 37 EPCs), making it one of the more compact homes locally.
Before you decide
Everything you need to know about 12 Gelli Street
The true value, the hidden risks and the full sale history, in one report.
Signs of HMO activity in the areaLarger development activity nearby
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The data behind every report
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 4)
Aug 2020
EPC Rating
A
B
C
D
D62
E
F
G
Main Heating
Gas
Main Fuel
Gas
Hot Water
Good
Windows
Average
CO2 Emissions
2.3 t/year
Occupancy
Rented
Certificate validity
Valid until 10 August 2030
Property Improvements
Changes detected from historical EPC data
Jan 2011from Jun 2010
EPC improved fromD63toF34
Heating System
Gas BoilerStorage Heaters
Heating system changed
Main Fuel
GasElectric
Changed to a more efficient fuel source
Hot Water
Main SystemImmersion (Off-Peak)
Hot water system changed
Windows
SingleFull Double
Single glazing replaced with double or better glazing
Low Energy Lighting
100%17%
Low energy lighting percentage decreased
Aug 2017from Jan 2011
EPC improved fromF34toD57
Heating System
Storage HeatersGas Boiler
Replaced storage heaters with gas boiler
Main Fuel
ElectricGas
Connected to mains gas supply
Hot Water
Immersion (Off-Peak)Main System
Hot water system upgraded
Low Energy Lighting
17%40%
More low energy lighting installed
Aug 2020from Aug 2017
Hot Water
Very GoodGood
Hot water efficiency decreased
Low Energy Lighting
40%100%
More low energy lighting installed
Get a survey for this property
Level 3 Building Survey
Victorian-eraGround Floor FlatEPC DPre-1919 buildExtended multiple times (2+ extensions)
Because the property was built before 1919 and has been extended more than once, we believe a Level 3 building survey should be considered.
From £820 · Includes VAT
Planning history
Applications and permits filed against 12 Gelli Street, Port Tennant, Swansea, SA1 8NJ, sourced from the PlanIt planning register.
12 Gelli Street has no planning applications on record.
47
But the area is active
47 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
Recorded transactions, our model's current estimate, and a quick read on what neighbouring properties have sold for.
12 Gelli Street has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
Current estimate
See how we calculated this£112,000
Modelled from EPC, postcode comparables.
No sales recorded with HM Land Registry
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
Median price across the last 5 sales in SA1 8NJ: £127,000 (2026–2024).
Nearby sales in SA1 8NJ
13 Gelli Street, Port Tennant, Swansea, SA1 8NJ
Sold May 2026
£92,5007 Gelli Street, Port Tennant, Swansea, SA1 8NJ
Sold Mar 2026
£129,50035 Gelli Street, Port Tennant, Swansea, SA1 8NJ
Sold Jan 2025
£127,0003 Gelli Street, Port Tennant, Swansea, SA1 8NJ
Sold Sept 2024
£137,95040 Gelli Street, Port Tennant, Swansea, SA1 8NJ
Sold Aug 2024
£104,950
Versus other Gelli Street homes
Four headline reads against 6 similar flats on this street, drawn from the latest EPC and Land Registry data.
12 Gelli Street outperforms the street on co₂ emissions by a wide margin.
EPC Rating
62 (D)
Street avg 63 (D)
Floor Area
43 m²
Street avg 51 m²
CO₂ Emissions
2.3 t/year
Street avg 2.6 t/year
Habitable Rooms
2 rooms
Street avg 2 rooms
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Start your researchSimilar properties nearby
A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
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1 Canaan Row, St Thomas
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£133k
1 Grenfell Park Road, St Thomas
SA1 8EY
£136k
1 Bay Street, Port Tennant
SA1 8LB
£147k
1 Balaclava Street, St Thomas
SA1 8BS
4 bed1 bath
£152k
1 Bay View, St Thomas
SA1 8BB
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.
Crime
580/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
St Stephens Church — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.
Common questions
The questions buyers, sellers and homeowners most often ask about 12 Gelli Street, Port Tennant, Swansea, SA1 8NJ. Each answer is also embedded as structured data for search engines.