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Get startedCastellfryn is a detached house in Menai Bridge (LL59 5BY). It has a recorded floor area of 239 m² (around 2573 sq ft), construction records dating it to 1991-1995 and council tax band G. The latest certificate (January 2019) shows an E (score 39), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since November 2008. Between certificates, window efficiency dropped from Good to Average and lighting dropped from Poor to Very Poor. The recommended improvements would push it to D (score 57). Main heating runs on lpg.
Sale prices here have outpaced England HPI: 12.9% per year against 0% for the wider region. Today's modelled estimate of £593,000 sits 74.4% above the 2019 sale of £340,000. On a £-per-square-foot basis, the last sale (£132/sq ft) was about 24.9% below the postcode norm. At 239 m² the property is well over the postcode median (151 m² across 22 EPCs), placing it in the larger end of the local stock. Last sale on file: £340,000 in September 2019.
Castellfryn's carbon output runs well above what efficient homes in the postcode produce.
Castellfryn has more than quadrupled in price since its earliest registered sale in 2000.
£593,000
Modelled from EPC, postcode comparables and a sale-price growth of 12.9% per year over 19 years.
£340,000
Growth on file: 12.9% per year over 19 years.
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Detailed AI analysis
On price per m², Castellfryn runs well behind the street norm.
Price per m²
£1,423
Street avg £2,501
Floor Area
239 m²
Street avg 160 m²
Habitable Rooms
8 rooms
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.4 km
Menai Bridge Art Gallery — bus stop.
2 September 2019Most recent
£340,000
+871.4%over 18 years1 December 2000
£35,000
Median price across the last 5 sales in LL59 5BY: £460,000 (2025–2021).
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Street avg 7 rooms
CO₂ Emissions
8.5 t/year
Street avg 7.1 t/year
LL59 5SE