Piled foundations are commonly used where ground conditions, structural loads or nearby buildings make conventional shallow foundations unsuitable.
They can be an effective engineering solution, but projects involving piles close to neighbouring properties deserve careful Party Wall consideration.
What are piled foundations?
Instead of spreading loads through relatively shallow foundations, piles transfer loads deeper into the ground.
There are many different piling systems and installation techniques.
Your structural and geotechnical engineers will determine the appropriate solution.
Does using piles automatically require a Party Wall Notice?
No.
The Party Wall Act does not simply say that every piled foundation requires notice.
The proposed excavation, position of the new structure and relationship with neighbouring buildings all need to be assessed.
Our Party Wall Excavation Explainer provides further guidance on the three-metre and six-metre excavation provisions.
Vibration may concern neighbours
Some piling methods can produce noise or vibration.
This can understandably concern adjoining owners, particularly where buildings are older or already contain visible defects.
The selected piling method and construction methodology may therefore become relevant to the Party Wall surveyors.
Engineers may need to provide additional information
The appointed surveyor may reasonably require technical information concerning:
- pile type;
- pile locations;
- depth;
- installation method;
- vibration controls;
- temporary works; and
- sequencing.
Our guide to Party Wall Notice drawings explains why pile positions and depths should be clearly shown for relevant excavation notices.
Special foundations
The Party Wall Act contains specific provisions concerning certain forms of special foundations.
This is a technical area and should be considered carefully where reinforced foundations extend beneath or interact with adjoining land.
Simple Survey has a dedicated guide explaining Special Foundations under the Party Wall Act.
Simple Survey can assist
If your development involves piles or specialist foundations close to neighbouring buildings, Simple Survey can review the scheme alongside the structural information.
Visit our Party Wall Surveyor page for specialist advice.