Garden-building foundations across BH23
Ground screws, concrete and raised timber-frame bases for garden rooms, offices, cabins and substantial garden buildings—with clear prices and a full 10-year guarantee.
Illustrative garden-room example
Build the extra space on the right base
A garden office near the historic centre, a cabin towards Burton and a coastal room around Highcliffe can face different ground, exposure and access. JustBases considers those practical differences alongside the building's floor support.
You do not need to decide between concrete, ground screws and raised timber before enquiring. The building type, approximate footprint and BH23 postcode give Craig enough to begin.
What are you planning?
Three easy steps
The foundation can be carefully specified without making first contact feel demanding.
Contact Craig with the intended use, approximate size and Christchurch postcode.
We compare systems and arrange a site visit only where seeing levels or access will help.
The footprint is set out and the base completed ready for the agreed building or frame.
Choose the foundation, not the complication
You do not need to choose one now. We compare the building, garden and access, then explain the simplest suitable option.
A continuous slab for substantial rooms and cabins designed around firm full-area support.
From £695 for 8' × 6' 48 ft² / 4.46 m²
Steel supports for compatible frames, concentrating disturbance at planned support positions.
Installed screws from £1,180 for 8' × 6'; frame quoted separately 48 ft² / 4.46 m²
A treated structural platform for suitable garden buildings above uneven or gently falling ground.
From £840 for 8' × 6' 48 ft² / 4.46 m²
Useful guide prices
These are current guide prices for standard installations. The written quotation confirms access, levels, preparation, ground conditions, support layout and any optional DPM or service conduit.
Get your exact written price| Base size | Concrete | Raised timber | Installed ground screws |
|---|---|---|---|
| 10' x 8' 3m x 2.4m 80 ft² / 7.43 m² | £965 | £1,195 | £1,280 |
| 12' x 8' 3.6m x 2.4m 96 ft² / 8.92 m² | £1,075 | £1,375 | £1,340 |
| 12' x 10' 3.6m x 3m 120 ft² / 11.15 m² | £1,195 | £1,585 | £1,400 |
| 14' x 10' 4.2m x 3m 140 ft² / 13.01 m² | £1,295 | £1,820 | £1,460 |
| 16' x 10' 4.8m x 3m 160 ft² / 14.86 m² | £1,445 | £1,995 | £1,500 |
| 20' x 10' 6m x 3m 200 ft² / 18.58 m² | £1,695 | £2,415 | £1,600 |
Ground-screw prices are for the installed screws only. A suitable timber or galvanised-steel support frame can be added to the written quotation. Raised-timber prices use suitable concrete or composite posts. Your quotation confirms exactly what is included.
Easy to start, free to ask
Tell us what you plan to build, its approximate dimensions and the Christchurch postcode. Craig will help choose the sensible foundation and send a written quotation.
Talk to Craig about your garden room base
Not sure which base you need? Craig will listen to what you are planning and explain the easiest next step.
Online quote requests are normally answered within 24 hours, excluding weekends.
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
Garden room base installation in Christchurch
Clear reassurance
The JustBases guarantee covers our installation workmanship and the foundation materials we supply, subject to the written quotation. It is separate from the garden-building supplier's warranty.
Realistic timing
Ground screws are normally installed in one day. Concrete bases are normally installed within two working days, with the next-stage timing confirmed for the project.
Frames available
We can supply a treated timber or galvanised-steel support frame where it forms part of the agreed ground-screw solution.
Genuine feedback on related building-base work
"Arrived on time, 2 guys very friendly and competent. Excellent job, impressive tidying up."
— Verified Customer
Checkatrade · BH11 · 2019-05-30
Work listed by the source: Concrete base for summer house
"Very professional, friendly and good communication. A job well done, thank you."
— Verified Customer
Checkatrade · BH21 · 2018-11-05
Work listed by the source: Concrete base
"Craig and Luke were polite, professional and extremely hard working. An excellent service all round. We would highly recommend."
— Verified Customer
Checkatrade · BH14 · 2017-12-11
Work listed by the source: Installation of base for cabin
"Work completed as agreed. Workers were friendly, polite and cleaned up on completion. Overall very pleased."
— Alan, Christchurch
MyBuilder · BH23 · 2024-05-20
Work listed by the source: Concrete base
Match the base to the space
The building name is only the starting point. We also consider its footprint, support arrangement, intended use and the garden it needs to fit.
An insulated room performs best on a square, level foundation coordinated with the floor, glazing and intended threshold height.
Suitable base options
Concrete
A firm, continuous solution for buildings designed for full-area slab support.
Ground screws and frame
Well suited to compatible framed rooms where excavation, access or programme favours point supports.
Raised timber
Useful for selected rooms where a framed platform resolves modest garden level changes.
In lower-lying parts of Christchurch, known winter water and finished floor height can be useful discussion points; on coastal plots, exposure may matter more to the building specification.
Ask about this base →
The base beneath a larger cabin should carry its perimeter and internal bearers at the positions intended by the manufacturer.
Suitable base options
Concrete slab
A natural fit for buildings that require a continuous rigid base.
Screw-supported frame
Can align point supports with an approved timber or galvanised-steel grid.
Raised timber platform
Can suit lighter cabins and create a level foundation above uneven ground.
Send the chosen model or base plan when you have it; approximate size is sufficient before purchase.
Ask about this base →
A specialist room's equipment and use can influence floor strength, vibration, service entries and foundation choice.
Suitable base options
Concrete base
Often the most direct route for heavy equipment and concentrated point loads.
Designed screw frame
A solution when the floor and frame are sized for the equipment and building.
Raised timber base
Can suit lighter specialist rooms once spans and load positions are agreed.
Tell Craig what the room will contain. A practical description is enough for us to identify any detail that affects price.
Ask about this base →
Pods often use a chassis or defined bearer layout, so foundation support should be placed for that structure.
Suitable base options
Ground screws with frame
Often a good match for defined supports, limited excavation and a ventilated clearance.
Concrete foundation
Appropriate when the pod supplier specifies a complete slab or integrated floor services.
Raised timber platform
Can support suitable lightweight units on an agreed structural grid.
Sleeping, holiday-let or self-contained use may need additional permission checks, but that does not prevent an early base discussion.
Ask about this base →Local ground context
BGS mapping for the Bournemouth district records Poole Formation and Branksome Sand alongside extensive terraces and alluvial deposits connected with the Avon and Stour. Conditions near the rivers, harbour, plateau and coast should not be generalised.
Previous landscaping, drainage, old slabs and imported material further change the near surface. The intended building and actual footprint guide the foundation; a BH23 label alone does not.
Customers can enquire without arranging technical reports. Share any known water history in ordinary language and we will explain whether it affects the options.
Access handled with you
Christchurch access can mean tight older streets and rear gardens, established suburban side passages or wider plots around Burton and Highcliffe. Coastal exposure, tree cover and a change in level may also shape the installation plan.
A quick picture of the route is helpful rather than compulsory. Craig will decide whether a visit is worthwhile and include the practical method in the written price.
Helpful if you have them—not required before you call:
Useful local guidance
BCP Council is the local planning authority. Permitted development depends on the room's use, dimensions and position and on the rights applying to the property; the foundation system does not create an exemption.
Christchurch Central, Purewell, Burton and other local areas have conservation designations, while river and coastal flood information can matter at individual addresses. Keep those checks specific and continue the foundation quotation alongside them.
Planning information is a practical starting point, not legal or planning advice. Confirm the position for the exact property and building with the relevant authority.
Choosing the building
These local businesses are useful for researching the room itself. When comparing models, ask for the exact outside footprint and any base specification.
Christchurch-area display site offering garden rooms and timber buildings.
Bespoke insulated garden rooms across Christchurch and neighbouring Dorset.
Local timber-building range with south-coast display sites.
These are independent research links only, not endorsements or partner relationships. Confirm current delivery, building details and base requirements directly.
Service area
Our BH23 service includes Christchurch, Highcliffe, Burton, Purewell, Mudeford and nearby communities.
Straight answers
A building type, approximate size and postcode are enough to start.