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AREA REPORT · GWYNEDD LL51

LL51.

Gwynedd

LL51 is an outcode in Gwynedd, covering the neighbourhoods of Porthmadog, Pen-y-groes, Tal-y-sarn & Dyffryn Nantlle and Cricieth & Llanaelhaearn. Over the last 12 months 4 properties changed hands — a median of £0 for flats (£0/sqm) and £200k for houses (£2,237/sqm). Housing stock peaks at EPC band E.

Sales · 12m
4
18 over 3y
Houses · £/sqm
£2,237
n=3
Flats · £/sqm
£0
n=0
EPC score
46
Potential 81
PRICE MATRIX
Sales by window, type, and floor area.
Houses · 6m
Avg £
£0
n=0
Median £
£0
n=0
Avg £/sqm
£0
n=0
Median £/sqm
£0
n=0
Houses · 12m
Avg £
£186k
n=4
Median £
£200k
n=4
Avg £/sqm
£2,109
n=3
Median £/sqm
£2,237
n=3
Houses · 3y
Avg £
£276k
n=18
Median £
£233k
n=18
Avg £/sqm
£2,845
n=16
Median £/sqm
£2,691
n=16
Flats · 6m
Avg £
£0
n=0
Median £
£0
n=0
Avg £/sqm
£0
n=0
Median £/sqm
£0
n=0
Flats · 12m
Avg £
£0
n=0
Median £
£0
n=0
Avg £/sqm
£0
n=0
Median £/sqm
£0
n=0
Flats · 3y
Avg £
£0
n=0
Median £
£0
n=0
Avg £/sqm
£0
n=0
Median £/sqm
£0
n=0
£/sqm derives from EPC-matched floor area. Thin-coverage rows appear muted.
PRICE + VOLUME · 25Y
Medians and monthly sales, 2001–present.
£0k£160k£319k2025Median house · 12m smoothedMedian flat · 12m smoothedSales volume (monthly)
EPC · 25Y
Certificates issued, by band.
017342010201520202025
A
B
C
D
E
F
G
Total issued
COUNCIL TAX
Band distribution.
Council tax data coming in Phase 2.
SECTORS
Drill down to sector.
LL51 9
Sales18
House£233k
Flat£0
COVERAGE
Neighbourhoods and wards.
Neighbourhoods (MSOA)
3 · click column to sort
Porthmadog
284
190
Pen-y-groes, Tal-y-sarn & Dyffryn Nantlle
45
21
Cricieth & Llanaelhaearn
1
0
Wards
4 · click column to sort
Dolbenmaen
277
183
Clynnog
45
21
Glaslyn
7
7
Llanystumdwy
1
0
LAND REGISTRY · EPC · ONS UPRN · GEOLYTIX · REFRESHED 25 APR 2026