Two-storey extensions in Tywyn
Need more room in Tywyn? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Tywyn at a glance
- Postcode districts
- LL35, LL36, LL37, LL38, LL39 and LL42
- Area
- Gwynedd and Anglesey, Wales
- Price region
- Wales
- Nearest towns
- Aberystwyth (11.8 miles), Penparcau (12.6 miles), Pwllheli (25 miles), Llanidloes (25.1 miles)
- Distance to Bangor (Gwynedd and Anglesey)
- about 44.4 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.
Around Tywyn we also work in Aberystwyth, Penparcau and Pwllheli, and across the rest of Gwynedd and Anglesey. Postcode districts in and near Tywyn: LL35, LL36, LL37, LL38, LL39 and LL42.
Extensions available in Tywyn

Two-storey rear extensions
Tywyn guide price from £51,500, Standard spec.
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Two-storey side extensions
From £79,000 in Tywyn. Free visit to firm it up.
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Two-storey wraparound extensions
Tywyn guide price from £111,000, Standard spec.
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Part single, part two-storey extensions
From £66,000 in Tywyn. Free visit to firm it up.
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Extensions over a garage
Design, approvals and build for Tywyn homes. Guide from £29,000.
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First-floor extensions
Design, approvals and build for Tywyn homes. Guide from £23,000.
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Two-storey extensions for semi-detached houses
For homes in Tywyn: typical guide from £51,500.
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Two-storey extensions for detached houses
From £79,000 in Tywyn. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Our Wales guide starts at £51,500 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
From £51,500 (plus en-suite) in Tywyn. Free visit to firm it up.
Learn moreWhich type suits your house?
If you're not sure which type fits, that's what the free visit is for. We'll sketch the realistic options for your house in Tywyn, with a rough idea of the approval route and cost for each.
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 Tywyn
Tywyn 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 Tywyn
Do you cover Tywyn?
Yes. We cover Tywyn (LL35, LL36, LL37, LL38, LL39 and LL42) and the surrounding area, including Aberystwyth and Penparcau. The first site visit is free.
What does a two-storey extension cost in Tywyn?
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 Tywyn do you cover?
Everywhere around it, including Aberystwyth (11.8 miles), Penparcau (12.6 miles) and Pwllheli (25 miles), and the rest of Gwynedd and Anglesey.