LL23 area guide
House prices, recent sales, crime and schools for the LL23 postcode district in Gwynedd. Free to read, from official open data. For one address in detail, run a full property report.
Gwynedd · 2026-05 (UK HPI)
Median £230,000
Street-level crime at the district centre
Ofsted rated, within one mile
What the data says about LL23
The average home across Gwynedd is worth about £203,619 (UK House Price Index, 2026-05), and the median of the 3 most recent Land Registry sales recorded inside LL23 is £230,000, and prices have risen 2.5% over the last year.
Of 155 energy certificates sampled across 12 postcodes in LL23, band D is the most common, and 64.5% of homes sit below band C — the point at which most lenders' green mortgage deals and future rental rules bite.
Police recorded 97 crimes around the centre of LL23 in the six months to 2026-06, most often violence and sexual offences (37).
There are 0 schools rated Good or Outstanding by Ofsted within a mile of LL23 in Gwynedd.
The district covers the Llandderfel, Llanuwchllyn, Y Bala ward areas.
Sample of 155 energy certificates from 12 postcodes in LL23, taken from the government energy performance register, most recent lodged 2026. Indicative of the district rather than a full census.
Prices changed +2.5% over the last year in Gwynedd.
Street-level crime from data.police.uk, six months to 2026-06.
Llandderfel · Llanuwchllyn · Y Bala
Common questions about LL23
What is the average house price in LL23?
The UK House Price Index puts the average home in Gwynedd at £203,619 as of 2026-05. Recent Land Registry sales recorded inside the LL23 district have a median price of £230,000.
How much does each property type cost in LL23?
Detached £315,747, semi-detached £209,692, terraced £160,432, flats £114,979, based on the UK House Price Index for Gwynedd.
Is LL23 a safe area?
Police recorded 97 crimes near the centre of LL23 in the six months to 2026-06. The most common category was violence and sexual offences with 37 reports. Crime is recorded at street level, so figures vary street to street within the same district.
What EPC rating do homes in LL23 usually have?
Band D is the most common rating in our sample of 155 certificates from LL23, with 64.5% of homes rated below band C. A full property report shows the exact certificate, running costs and recommended improvements for one address.
What are the schools like near LL23?
0 schools within a mile of the LL23 district centre are rated Good or Outstanding by Ofsted. Catchment areas are set by the local authority and can change year to year.
Where does this LL23 data come from?
HM Land Registry Price Paid Data and the UK House Price Index for prices, the government's energy performance register for EPC bands, data.police.uk for crime, Get Information About Schools and Ofsted for schools, and ONS postcode geography. All are published under the Open Government Licence v3.0.
A full report covers the energy certificate, sale history and valuation, council tax band and bill, flood and crime risk, schools, transport and neighbourhood data for a single property.
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Sources: HM Land Registry Price Paid Data and UK House Price Index, ONS postcode geography, data.police.uk, Get Information About Schools and Ofsted. Contains public sector information licensed under the Open Government Licence v3.0.