Garden-building foundations across Winchester
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
A level foundation in a city of slopes
A central walled garden, a steep chalk-side plot and a suburban room near the Itchen can each need different access, preparation and finished levels. The chosen building's structure still determines where support is required.
JustBases compares concrete, ground screws and raised timber in plain language. Share the building type, approximate size and SO22 or SO23 postcode and Craig will provide the next clear step.
What are you planning?
Three easy steps
You do not need archaeological, ground or structural answers before calling.
Call, message or use the form with the room type, rough footprint and location.
Craig considers slope, access and the building and visits if the site needs seeing.
The footprint is set out and installed ready for the garden building.
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 rigid continuous foundation for substantial rooms designed around slab support.
From £695 for 8' × 6' 48 ft² / 4.46 m²
Driven steel support points for a compatible frame, with focused excavation and no curing delay.
Installed screws from £1,180 for 8' × 6'; frame quoted separately 48 ft² / 4.46 m²
A treated structural base for suitable rooms on uneven or sloping Winchester 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 us what you want to build, the approximate footprint and Winchester postcode. Craig will compare the sensible base routes 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 Winchester
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 came to give a quote and completed work within time scale. Very friendly company, very helpful and the job was tidy and looks perfect. Would highly recommend."
— Verified Customer
Checkatrade · KT11 · 2018-06-22
Work listed by the source: Base for log cabin
"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
"A high standard of work and very pleasant lads to deal with. I would not hesitate to recommend them."
— Verified Customer
Checkatrade · BH24 · 2018-01-10
Work listed by the source: Concrete base for workshop
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 an accurately sized base beneath insulation, doors and glazing, with thresholds coordinated to the garden.
Suitable base options
Concrete
Continuous rigid support for rooms specified for a slab.
Ground screws and frame
Can suit compatible rooms where slope, excavation or programme favours point support.
Raised timber
Useful for selected timber rooms across a manageable city garden fall.
Central access, chalk slopes, archaeology and protected trees are all address-specific; Craig keeps the first conversation focused on the room and site you actually have.
Ask about this base →
A substantial timber building needs dependable bearing under wall rails and internal floor supports.
Suitable base options
Concrete slab
Suitable where the cabin supplier requires complete continuous support.
Screw-supported frame
Can align support points with an approved bearer layout.
Raised timber platform
Practical for compatible cabins on sloping gardens.
The final base plan is useful before set-out, but approximate dimensions are enough for initial advice.
Ask about this base →
Heavy equipment, acoustics and services can make floor strength and stiffness important to the base.
Suitable base options
Concrete foundation
Often simplest beneath heavy equipment and point loads.
Engineered screw frame
Can work where floor and support grid account for the intended use.
Raised timber base
Possible for lighter rooms with suitable spans and support positions.
Describe the equipment and Craig will identify only the information needed for a reliable quote.
Ask about this base →
Pods need correctly placed support beneath their chassis or bearers and a practical route to the garden.
Suitable base options
Ground screws plus frame
Often suited to defined supports and reduced excavation.
Concrete foundation
Appropriate where the unit requires a complete slab.
Raised timber platform
Can support suitable lightweight pods on an agreed grid.
Sleeping or letting use and the historic setting can alter permissions; foundation advice can run alongside those checks.
Ask about this base →Local ground context
BGS sheet 299 places Winchester predominantly on Chalk, with river-terrace sands and gravels and alluvium along the Itchen. Dry valleys, steep slopes and made ground in the historic city add local variation.
Chalk is not a complete foundation specification: weathering, fill, buried remains and the building all matter at the actual footprint. We compare methods from the real project rather than the city geology alone.
No ground or archaeological report is required to start a conversation. We explain any property-specific need only if it becomes relevant.
Access handled with you
Winchester can involve walled gardens, narrow passages, protected trees, steep levels and controlled parking. Suburban and village-edge properties may offer wider routes but still contain chalk obstructions or old structures.
An optional photograph helps us understand the route. Craig will visit when access, slope or garden position needs to be seen before pricing.
Helpful if you have them—not required before you call:
Useful local guidance
Winchester City Council is the planning authority. Permitted development depends on the complete building's use, height, position and footprint and the rights applying to the property.
The council lists 37 conservation areas and provides address mapping and protected-tree guidance. Archaeology and historic boundaries may be relevant in parts of the city, but they should not be generalised across every garden.
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 and regional businesses can help with selecting the room. Ask for precise external dimensions and any support layout.
Winchester-area garden rooms, cabins and timber buildings.
Tailored garden studios in the Winchester area.
Hampshire garden rooms and offices with an Eastleigh showroom.
Independent research links only. No endorsement, partnership or previous joint project is implied; confirm service and base details directly.
Service area
Our service covers SO22, SO23 and surrounding Winchester neighbourhoods and nearby villages.
Straight answers
A building type, approximate size and postcode are enough to start.