Northumberland & surrounding areas
House Extensions in Northumberland
Alpine Extensions designs and builds bespoke home extensions throughout Northumberland — from the first ideas and your 4D design, through planning and Building Regulations, to a finished extension built by our own managed team.
Designed around your home
The space you need, in the home you already have.
Very few families move because they dislike where they live. They move because the kitchen is too small, there is nowhere for everyone to sit, or the house simply does not work the way it used to. An extension solves that problem where you are.
Northumberland covers an unusually wide range of housing — traditional and stone-built properties, period cottages and townhouses, post-war semis and modern estate homes. A design that suits one of those rarely suits another, which is why we do not work from a standard template. Roof form, proportions, materials and where the glazing sits are all decided in relation to the house itself.
Alongside the property, we look at the space genuinely available around it and at what you want the new room to do: a wider kitchen and dining space, a family room that connects to the garden, or a bright orangery you can use in winter. You can see how that thinking plays out across our completed projects, or read more about Alpine Extensions.
What we build
Extensions we build in Northumberland
Four ways to add space and light, each designed specifically for the property it joins.
One team, one contract
A complete design and build service
Extending a house can mean appointing an architect, a planning consultant, a structural engineer and a string of separate trades. We remove that entirely — the project is managed by us from the earliest design stage through to construction.
Design & approvals
- Initial home consultation
- 4D virtual design
- Architectural drawings
- Planning applications where required
- Building Regulations
- SAP calculations where required
- Structural calculations
Structure & envelope
- Groundworks and foundations
- Brickwork
- Roofing
- Windows and doors
- Insulation
Services & finish
- Electrics
- Plumbing
- Heating
- Plastering
- Project management
Your extension is completed plastered and ready to decorate, with the heating, electrics and plumbing already finished. The main things left for you are painting or decorating the walls and laying the flooring you have chosen.
How it works
Five clear stages
- 01
Free home consultation
We visit the property, understand what you want to achieve and assess the space you have available.
- 02
4D virtual design
You can visualise and experience the proposed extension in detail before construction begins.
- 03
Planning & approvals
We manage the drawings, planning requirements, Building Regulations and relevant calculations.
- 04
Construction
Your extension is professionally built and managed through every stage of the programme.
- 05
Your new space
The completed room is plastered and ready for you to decorate and lay your chosen flooring.
Recent work
Extension Projects Across Northumberland
Genuine Alpine Extensions projects, photographed on completion.
Where we work
House Extensions Across Northumberland
We provide our full design and build service throughout Northumberland and the surrounding areas, from the commuter towns and villages of the south east of the county out towards the Tyne Valley and the north.
- Morpeth
- Ponteland
- Darras Hall
- Hexham
- Corbridge
- Cramlington
- Prudhoe
- Alnwick
- Bedlington
- Ashington
Not in Northumberland? We also build across Newcastle and Durham and County Durham.
Why Alpine
Why choose Alpine Extensions?
Complete design and build service
From the first sketch to handover, the whole project sits with one accountable team.
4D virtual extension designs
Explore the finished room in detail and refine it while changes still cost nothing.
Planning & Building Regulations managed
Drawings, applications and calculations prepared and submitted on your behalf.
10-year guarantee
Ten years of written cover on the structure and workmanship we deliver.
North East extension specialists
A family-run team working across Northumberland and the wider North East.
Finance options available
Practical ways to spread the cost, set out clearly alongside your fixed quotation.
Award recognition
- G23 Awards — Finalist
- Installer Awards 2024 — Winner
- Business Awards 2023 — Winner
- G25 Awards — Finalist
Client words
Hundreds of five-star reviews
The 4D design was the moment it clicked. We changed the roof lantern twice on screen — and never once on site.
Questions
Northumberland house extension FAQs
How much does a house extension cost in Northumberland?+
Cost depends on the individual project: the size and design of the extension, the specification you choose, the foundations required, how much glazing is involved and the particular characteristics of your property. We prepare a detailed quotation for your proposed project once we have visited the house and developed the design with you.
Do I need planning permission for an extension in Northumberland?+
It varies from property to property. Some extensions fall within Permitted Development rights, while others require a planning application — and the answer can change depending on the design, the size of the plot and any restrictions that apply to your home. We assess the requirements for your project and manage the planning process where one is needed.
Do you handle Building Regulations?+
Yes. The Building Regulations process, together with the structural and SAP calculations required for your project, is managed by us as part of our complete extension service.
Can you extend traditional properties in Northumberland?+
Northumberland has a broad mix of housing, from older traditional and stone-built homes to recent developments. Good extension design considers the appearance, proportions and character of the existing property rather than applying a standard template, so every project we design is worked out around the individual home and what the owner wants from the new space.
Which areas of Northumberland do you cover?+
We work throughout Northumberland, including Morpeth, Ponteland, Darras Hall, Hexham, Corbridge, Cramlington, Prudhoe, Alnwick, Bedlington, Ashington and the surrounding areas.
How is the extension finished?+
We take care of the main building work along with the electrics, plumbing, heating, insulation and plastering. The extension is left plastered and ready to decorate, so the main things left to you are painting the walls and laying your chosen flooring.
Start your project
Thinking About Extending Your Northumberland Home?
Book a free consultation and we'll walk through your ideas at the property, tell you honestly what the space can take and follow it with a personalised, fixed quotation.
- Design consultation at your home or online
- Photoreal 4D walkthrough of your new space
- Fixed-price quotation within 7 days