Ground conditions
Made ground, clay, roots, groundwater and previous structures can alter excavation and foundation requirements.
Extensions
Extension foundations
Foundations are hidden at completion, yet they set the accuracy, stability and early programme for the whole extension.
Photos, drawings or a short description can help explain the current condition.
Extensions · Extension foundations
Start below the finished surface
The correct approach depends on soil, trees, drains, neighbouring structures, loading and design. Ground assumptions should be tested before a convenient standard detail is treated as suitable for every site.
Part of wider extensions work?
Mention the full job when you contact Flyson so this element can be considered in the right context.
Ground, access and water
Existing drains
Routes and depths should be identified because they may require protection, diversion or formal build-over consideration.
Setting out
Dimensions, levels and diagonals established here carry through the masonry, openings, roof and final floor connection.
What to mention
What Flyson needs to understand about the ground
- Describe what is already known about ground conditions.
- Explain the priority or constraint around existing drains.
- Include enough context to discuss setting out without assuming a product or method before the property is understood.
Questions specific to extension foundations
Can foundation depth be fixed before digging?
A design may give an expected depth, but actual ground conditions and building-control inspection can affect what is required on site.
What happens to excavated material?
Storage, reuse and removal should be included in the site plan because access and disposal can materially affect the job.
Are groundworks priced separately?
They can be shown as a clear stage within an extension quotation, with assumptions and any provisional items identified rather than hidden.
Continue exploring extensions
Garage conversions
Converting an existing garage can create useful space with less new structure, provided moisture, insulation, levels, ventilation and access are properly resolved.
Explore garage conversionsKitchen-diner extensions
A kitchen-diner extension succeeds when the building work, room layout, services and everyday circulation are designed around each other.
Explore kitchen-diner extensionsDouble-storey extensions
Two-storey work can create significant space, with a correspondingly greater need for coordinated structure, roof design, circulation and programme control.
Explore double-storey extensionsRelated work
View roofingRoofing
Roof form, junctions and rainwater routes affect the shell and existing house.
Related work
View landscapingLandscaping
Thresholds, steps, paving and garden levels can be planned with the extension rather than repaired later.
Project enquiry
Ask about extension foundations.
Explain what the ground must support and any known access, level, drainage or excavation constraints.