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Tell Craig about the timber-frame building, approximate size and postcode. You do not need a finished specification to start.
Specialist foundation installation
Ground Screws for Timber Frame Extensions & Buildings
Keep your timber-frame project moving with ground-screw foundations: less digging, less mess and no concrete-curing wait. A practical option for year-round installation, with traditional concrete foundations available too. Call Craig to discuss your extension or new timber building.
50+ years
Family groundwork experience
Full 10-year
Written JustBases guarantee
Call Craig directly
Friendly practical advice
One clear price
Written foundation scope
Start with what you want to build
The right foundation for your timber-frame building
A timber-frame extension is more than a larger garden room. Its foundations need to carry the building’s loads and work with the floor, door thresholds and connection to the existing house. JustBases welcomes enquiries from homeowners, timber-building companies and main contractors for attached extensions and freestanding timber structures.
Support the actual building
Wall loads, roof spans, floor use and cladding influence the foundation design. Timber construction alone does not establish the required screw count or capacity.
Explore the details →Keep the programme moving year-round
With no concrete-curing stage, an accepted screw foundation can be handed over promptly for the frame. That reduces one source of weather-related delay without making the whole build weatherproof.
Explore the details →Less mess and garden disturbance
Localised supports can reduce digging, excavated spoil and concrete deliveries. We plan access and protection too, because machinery and associated groundwork still affect the site.
Explore the details →Connect old and new carefully
The designer needs to consider relative movement between the extension and existing house, including the floor junction and weatherproof connection.
Explore the details →Three easy steps
From first call to a finished foundation
Getting started is simple. We will guide you through the choices and explain any information needed before installation.
Talk through the options
We discuss the site and suitable foundations, identify any supplier information needed and provide a clear written quotation.
Install and hand over
Our team marks out and installs the agreed foundation, with the required checks before the next stage of your project.
Choose the foundation, not the complication
Foundation options for your timber-frame building
These are the methods worth assessing for this application. The structure, support plan and actual ground determine the right choice—not a one-size-fits-all specification.
Installed ground screws
Ground screws and an approved subframe
A designed screw-supported subframe can be suitable for lightweight timber-frame buildings and extensions. Product selection, support spacing and connections must be accepted for the loads and site. Heavier structures may need another engineered piling system rather than ordinary garden-building screws.
Worth considering for: Compatible timber-frame and lightweight extension designs
Ask about this option →
Concrete
Designed concrete foundations
Strip or trench-fill foundations, a designed raft, or individual concrete pads may be appropriate depending on the building and ground. We can quote the agreed concrete work, including access and spoil removal where specified. A generic garden slab is not a house-extension foundation design.
Worth considering for: Projects whose approved design calls for traditional foundations
Ask about this option →Clear prices, agreed scope
A price for your project
Specialist foundations need a quotation matched to the structure, ground and installation scope. A generic garden-building price would not reliably represent this project. Call Craig with your idea and postcode to get started.
No VAT is added to the guide prices shown.
Get your exact written priceView the full base price guideThe structure
Its loads, footprint and accepted support arrangement.
The site
Ground conditions, levels, buried services and practical access.
The foundation package
Specified materials, installation and any agreed testing or supporting frame.
The written quotation
Clear inclusions, responsibilities and timing before work is booked.
Easy to start, free to ask
Tell us about your timber-frame building
You do not need drawings or a finished specification before getting in touch. Send what you have and Craig will explain the useful next step.
Helpful details, if available
- Postcode and whether the building is attached or freestanding
- Approximate footprint and intended use
- Photographs of the garden and access
- Builder or timber-frame supplier, if selected
- Any drawings already available and your preferred timing
Talk to Craig
Craig will listen to what you are planning and help establish the foundation information that matters.
Online quote requests are normally answered within 24 hours, excluding weekends.
Request your free quote
Just give us your contact details and a short description of what you want to build. We will guide you through the rest.
Your enquiry
Timber Frame Extensions & Buildings installation
Planned around its use
What matters for your timber-frame building
For a compatible design, ground screws provide individual supports beneath an approved timber or steel subframe. This can keep excavation localised and make a tight rear-garden site easier to manage. The screw positions follow the building’s load paths rather than a standard shed-base grid; a wide opening or heavy wall may change the support requirements.
A screw-only foundation needs no poured concrete to cure, offering useful flexibility when planning autumn and winter work. Wet or cold weather does not automatically prevent installation, but safe access, frozen ground, flooding and the actual soil still matter. We assess the conditions rather than promise installation in every kind of weather.
Ground screws can also support a lower-impact construction approach by reducing concrete use, excavated spoil and associated transport. That is a practical advantage, not a claim that steel foundations are carbon-free. The environmental comparison depends on the complete design, material quantities, transport and eventual disposal or reuse.
Smaller areas of excavation can help retain more of the established garden, vegetation and surrounding habitat. This can be useful near trees, but screws must not simply be driven through roots: protected trees, root protection areas and wildlife may need specialist advice and an agreed working method. Local preparation and service trenches can still produce spoil.
We also offer traditional concrete foundation work where specified. Our role is to install the agreed foundation package and coordinate with your builder; timber-frame manufacture, structural design and the completed extension are not automatically included. Start with a call, a location and an outline of what you want to build.
Discuss your project with Craig →Support the actual building
Wall loads, roof spans, floor use and cladding influence the foundation design. Timber construction alone does not establish the required screw count or capacity.
Keep the programme moving year-round
With no concrete-curing stage, an accepted screw foundation can be handed over promptly for the frame. That reduces one source of weather-related delay without making the whole build weatherproof.
Less mess and garden disturbance
Localised supports can reduce digging, excavated spoil and concrete deliveries. We plan access and protection too, because machinery and associated groundwork still affect the site.
Connect old and new carefully
The designer needs to consider relative movement between the extension and existing house, including the floor junction and weatherproof connection.
Coordinate floor levels
Allow for the complete insulated floor build-up, threshold detail, damp protection and any required ventilation before setting support heights.
Understand the ground
Services, old footings, trees and variable soils can affect the layout. Investigation, trial installation or load testing may be needed to support the design.
Plan an orderly handover
Agree the foundation drawings, connections and inspection requirements with the building team before installation, then hand over the accepted supports for the frame.
When the design and ground are suitable
Why consider ground screws?
Year-round flexibility
A screw-only foundation avoids pouring and curing concrete, reducing one source of weather-related delays. Unsafe access, flooding, frozen or unsuitable ground can still mean postponing installation.
Less digging and mess
Localised supports can reduce excavation and spoil compared with extensive concrete foundations. Clearance, pre-drilling, service trenches and machinery access may still disturb the site.
A lower-impact approach
Using less concrete and moving less spoil can reduce material use and transport. Retaining vegetation may benefit habitats, but trees and wildlife still need protection. Steel manufacture and the full project design matter to any carbon comparison.
Before installation
Dimensions, approvals and responsibilities
We can speak directly with your timber-frame supplier or builder to define the foundation package. Clarify who provides engineering, investigations and building-control submissions, and who supplies and installs the supporting frame. These responsibilities should appear in the project scope, not be left until the building arrives.
House extensions and habitable buildings need the appropriate planning and building-regulations checks. Some extensions qualify for permitted development subject to limits and conditions; others require planning permission. Ground screws do not remove those obligations. Your designer or local authority can confirm the route for your property.
Installation follows the accepted structural detail and safe working plan. Any unexpected obstruction or unsuitable ground needs review before changing support positions. Trees, shared boundaries and nearby drains may introduce additional permissions or design constraints.
JustBases quotes the agreed foundation and groundwork. Product installation, specialist connections, commissioning and third-party design remain outside our scope unless the written quotation expressly includes them.
Genuine customer feedback
A full 10-year JustBases guarantee
Our full written guarantee covers installation workmanship and the foundation materials we supply, subject to your quotation. Read what customers say about our foundation work below, with the original job types and sources shown.
"I couldn't recommend Craig highly enough! Communication prior to the job was outstanding even considering our ever changing goal posts. Craig and his team turned up exactly at the agreed time, were well presented, friendly and professional. The cleanliness, attention to detail and quality of the job was outstanding."
— Verified Customer
Checkatrade · BH16 · 2020-05-27
Work listed by the source: Log cabin foundation
"Good standard of workmanship. Friendly and efficient. Prompt response for estimate and fitted into our timescale. Will be using the firm in future and thoroughly recommend them."
— Verified Customer
Checkatrade · SP6 · 2019-09-16
Work listed by the source: Concrete base for new summerhouse
"Craig and his team were very professional throughout the job. They worked tirelessly and extremely hard. The job involved digging up a thick reinforced concrete base. Then creating a whole new base with precision engineering in preparation to accept a new building on top. The result was an excellent job all round."
— Verified Customer
Checkatrade · BH24 · 2021-11-30
Work listed by the source: Building foundations and landscaping
Our service area
Foundation installation across the South
For this application we cover Dorset, Hampshire, South Wiltshire. Tell Craig the postcode and we will confirm the suitable installation options and travel requirements.
Straight answers before you decide
Timber Frame Extensions & Buildings FAQs
Yes, where the structural design and ground conditions support that solution. The engineer must check the complete load path from the building through the frame and screw connections into the soil. It is not enough simply to choose a screw because the extension is timber framed.
Still unsure? Send Craig a short enquiry and we will help with the next step.
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Explore this application →Tell us what you want to build
An outline of the project and your postcode are enough to start.