Two-storey extensions in Blaenau Ffestiniog
Homeowners in Blaenau Ffestiniog can use us for the whole project or just the drawings and approvals. Start with a free visit.
Blaenau Ffestiniog at a glance
- Postcode districts
- LL41, LL47, LL48 and LL49
- Area
- Gwynedd and Anglesey, Wales
- Price region
- Wales
- Nearest towns
- Bethesda (13.9 miles), Caernarfon (17.1 miles), Bangor (Gwynedd and Anglesey) (18 miles), Menai Bridge (18.8 miles)
- Distance to Bangor (Gwynedd and Anglesey)
- about 18 miles
- Approvals
- Two-storey rear: ground floor up to 4 m, first floor up to 3 m and 10.5 m from the rear boundary. Some two-storey side extensions can be permitted development.
We cover postcode districts LL41, LL47, LL48 and LL49 in and around Blaenau Ffestiniog, along with neighbouring Bethesda, Caernarfon and Bangor (Gwynedd and Anglesey).
Extensions available in Blaenau Ffestiniog

Two-storey rear extensions
Blaenau Ffestiniog guide price from £51,500, Standard spec.
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Two-storey side extensions
Design, approvals and build for Blaenau Ffestiniog homes. Guide from £79,000.
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Two-storey wraparound extensions
For homes in Blaenau Ffestiniog: typical guide from £111,000.
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Part single, part two-storey extensions
From £66,000 in Blaenau Ffestiniog. Free visit to firm it up.
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Extensions over a garage
Blaenau Ffestiniog guide price from £29,000, Standard spec.
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First-floor extensions
Our Wales guide starts at £23,000 for this type.
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Two-storey extensions for semi-detached houses
For homes in Blaenau Ffestiniog: typical guide from £51,500.
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Two-storey extensions for detached houses
From £79,000 in Blaenau Ffestiniog. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Blaenau Ffestiniog guide price from £51,500 (before kitchen units), Standard spec.
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Extra bedroom and en-suite extensions
Our Wales guide starts at £51,500 (plus en-suite) for this type.
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Blaenau Ffestiniog we also design annexes, home offices and bedrooms over garages.
Also available in Gwynedd and Anglesey
- Two-storey front extensions
- Two-storey extensions for end-of-terrace houses
- Two-storey annexe extensions
- Garage conversions with a room above
- Two-storey extension plans and drawings
- Planning permission for two-storey extensions
- Structural engineering for two-storey extensions
- Building regulations for two-storey extensions
- Party wall notices for extensions
- Design and build two-storey extensions
Rules for Blaenau Ffestiniog
Blaenau Ffestiniog is in Wales. Two-storey rear: ground floor up to 4 m, first floor up to 3 m and 10.5 m from the rear boundary. Some two-storey side extensions can be permitted development. Householder planning application: £585. Councils normally decide householder applications within 8 weeks.
The full Wales rules explained
Questions about extensions in Blaenau Ffestiniog
Do you cover Blaenau Ffestiniog?
Yes. We cover Blaenau Ffestiniog (LL41, LL47, LL48 and LL49) and the surrounding area, including Bethesda and Caernarfon. The first site visit is free.
What does a two-storey extension cost in Blaenau Ffestiniog?
Using our Wales guide, a two-storey rear extension with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) is about £51,500–£69,500 including VAT. An extension over a garage is about £29,000–£42,000.
Which other places near Blaenau Ffestiniog do you cover?
Everywhere around it, including Bethesda (13.9 miles), Caernarfon (17.1 miles) and Bangor (Gwynedd and Anglesey) (18 miles), and the rest of Gwynedd and Anglesey.