Garden-building foundations across Southampton
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
Create valuable space behind the house
A room behind a terrace, a larger suburban office and a cabin near the Test or Itchen can each present different access, service and ground questions. JustBases selects the foundation around the building and route rather than offering one city-wide answer.
Call, WhatsApp or send the form with the building type, approximate dimensions and Southampton postcode. Craig will compare concrete, ground screws and raised timber without demanding full plans first.
What are you planning?
Three easy steps
We keep the enquiry brief and put the important detail into the written price.
Share its intended use, approximate footprint and SO postcode.
Craig assesses the practical methods and arranges a visit if the urban route or levels need seeing.
The chosen foundation is completed ready for the approved room or support 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 rigid slab for substantial rooms designed to bear across the full floor.
From £695 for 8' × 6' 48 ft² / 4.46 m²
Driven steel supports beneath a compatible frame, reducing full-area excavation and curing delay.
Installed screws from £1,180 for 8' × 6'; frame quoted separately 48 ft² / 4.46 m²
A treated structural platform for suitable timber rooms on uneven urban or suburban gardens.
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 Craig what you plan to build, its approximate footprint and Southampton postcode. We will compare the suitable foundation routes and provide a written quote.
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 Southampton
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
"Craig and his team have been fantastic. Had the team over twice now to help with our garden project and both times I've been super impressed with the work. The team are extremely hard working but most important to me is the quality of their workmanship. The fencing looks amazing and the cabin was spot on in terms of dimensions and perfectly level. I would highly recommend."
— Verified Customer
Checkatrade · SO53 · 2024-01-28
Work listed by the source: Garden fencing and cabin base
"Craig and Luke are great. They turn up on time, do a quality job and leave the area clean and tidy. They are professional and pleasant to deal with. Wouldn't hesitate to recommend."
— Verified Customer
Checkatrade · SO18 · 2018-08-22
Work listed by the source: Clearance of garden sheds and concrete bases
"From estimate to completion of work, the whole experience was a pleasure. Highly professional team and superb standard of work."
— Verified Customer
Checkatrade · SO30 · 2018-03-19
Work listed by the source: 12 x 8 concrete base for summer house
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.
A daily-use room needs accurate support beneath insulation, doors and glazing and a level suited to the garden path or patio.
Suitable base options
Concrete slab
Firm continuous bearing for rooms designed for a full-area foundation.
Ground screws and frame
Useful for compatible rooms where excavation, access or programme favours point supports.
Raised timber
Can level selected timber rooms above a modest urban garden fall.
Through-house or alley access may influence the easiest installation method, while plots near the rivers can make finished height and water history more relevant.
Ask about this base →
A large timber building needs dependable support under perimeter rails and internal bearers.
Suitable base options
Concrete
Suitable where the supplier specifies a rigid full slab.
Screw-supported frame
Can align an approved frame with the cabin bearer layout.
Raised timber platform
Useful for compatible buildings on uneven ground.
A supplier support plan is helpful before installation, while dimensions and model are enough to start the quote.
Ask about this base →
Equipment weight, vibration and service routes can alter floor and foundation requirements.
Suitable base options
Concrete base
Often the straightforward choice beneath heavy equipment.
Engineered screw frame
Can work where support and floor account for expected loads.
Raised timber base
Possible for lighter uses with suitable spans and load positions.
Tell Craig what will be installed inside. We will ask only for information that changes the foundation scope.
Ask about this base →
A pod needs support at its chassis or bearer positions and an installation plan suited to the route through the property.
Suitable base options
Ground screws and frame
Often suited to defined supports and limited excavation.
Concrete foundation
Appropriate when the pod is designed for a full slab.
Raised timber platform
Can suit compatible lightweight units on a structural grid.
Sleeping or letting use may require different planning and building checks; the foundation can be discussed alongside them.
Ask about this base →Local ground context
BGS sheet 315 records Hampshire Basin clays and sands, Test and Itchen river terraces and alluvium with peat and clay near the watercourses. Urban made ground and buried structures add another realistic layer in Southampton gardens.
A city postcode cannot distinguish a redeveloped plot from an established suburban lawn. We use the building, footprint and known site history to compare foundation options.
No investigation is required before first contact. Mention drains, old buildings or known water if you can; Craig will explain whether any follow-up is relevant.
Access handled with you
Southampton projects can involve through-house access, narrow alleys, permit parking and busy streets. Suburban plots may offer wider routes but contain established boundaries, trees or buried services.
Share an optional route photo and Craig can plan the efficient method. A site visit is available where unloading, levels or access need confirmation.
Helpful if you have them—not required before you call:
Useful local guidance
The complete room's use, height, position, footprint and the property's permitted development rights decide whether permission is needed. The foundation type does not.
The city lists 20 conservation areas and maps areas of archaeological potential, trees and planning constraints. Use those resources for the exact address while continuing the base quotation.
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 nearby companies offer rooms, cabins and timber buildings. Ask the chosen supplier for its outside footprint and base-support requirements.
Southampton-based timber garden buildings.
Eastleigh showroom with garden rooms and offices.
Garden rooms and cabins supplied across Hampshire.
Independent research links only. No endorsement, partnership or prior joint work is implied; confirm delivery and base details directly.
Service area
Our city service covers SO14–SO19 and surrounding Southampton neighbourhoods.
Straight answers
A building type, approximate size and postcode are enough to start.