Bespoke oak-frame extensions

Handcrafted oak, designed around the home you already love.

For nearly 30 years, Welsh Oak Frame has designed and handcrafted bespoke oak frame extensions for homes across the UK. Each frame is handcrafted in our workshop, then raised on site to become a room of real presence: vaulted, light-filled and made to last for generations.

From a sunlit oak orangery to a two-storey oak-framed extension, each design begins with your house, not a catalogue. Whether it’s a period cottage, farmhouse, or contemporary new build, we shape the proportions, roofline, and glazing so the new space feels as though it was always meant to be there.

Oak-frame extensions, shaped around your home

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Oak Garden Rooms

A quiet oak garden room for reading, working or simply looking out.
 Arboreta - Arnott orangery (7)

Orangeries

Classic oak orangeries with lantern roofs and generous light.
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Kitchen extensions

Oak-frame kitchen extensions built for long dinners and busy mornings alike.
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Conservatories

Oak conservatories with the warmth of timber and the openness of glass.
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Sunrooms

Faceted and gable-ended oak sunrooms that follow the sun through the day.
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Double-storey extensions

Two-storey oak extensions that add a principal suite above and living space below.

Bespoke extension design and planning, handled in-house

Our in-house design team works with the character of your existing building, so the oak extension complements it rather than competing with it. We take care of the detail that often slows projects down: the planning application, building regulations drawings and structural calculations.

You deal with one team from first sketch to final frame, with designers and craftsmen working side by side.

Explore our design and planning service

Why choose an oak-frame extension?

Oak brings something no other material quite matches: warmth you can see and texture you can feel. Exposed beams, curved braces and handmade joints give an oak-framed extension a sense of permanence, and the timber only deepens in character as the years pass.

Vaulted ceilings with oak trusses lift a room and draw in light. A fully glazed gable above the doors frames the garden beyond and connects your home with its setting in every season.

Oak is also a renewable material that locks away carbon for the life of the building. Thoughtfully designed, an oak frame extension pairs natural beauty with a lower-impact way to build.

Your journey with us

Building an oak extension should be as rewarding as living in one. From the first conversation to the day your frame is raised, we guide you through each stage with clear advice and a dedicated team.

Discover our extensions process

Inspiration for Your Oak Extension

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Galleries

Browse finished oak frame extensions, inside and out.
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Case studies

Read how our clients created the rooms they now live in.
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Extensions advice

Expert guidance on design, planning and budgeting.

Already Have Plans for an Oak Extension?

If you or your architect already have drawings, we can quote from them directly or adapt the design to bring oak into the scheme.

Send us your drawings

Create your own mood board

Gather your favourite images from our galleries in one place: rooflines, glazing, joinery details, finishes. Share your mood board with one of our designers and it becomes the brief for your oak frame extension.

start your mood board

Frequently asked questions

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How much does an oak frame extension cost?

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What is green oak? Why it’s used in oak frame construction?

 Kitchen Extension Interior In Oak Frame - Oak Frame Roof Truss

What do I need to know about building an oak extension?

Begin your oak frame extension with a conversation. Request our brochure or speak to one of our designers about your home.

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Request a brochure

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Talk to a designer