Existing foundations unknown

Older buildings may have no record of foundation depth or type. Before extending or altering, the structural engineer may need investigation (trial pits, opening up) to assess adequacy. New work may then be designed to match or improve on the existing.

Most teams review existing foundations unknown when live project risk needs turning into a clear technical decision with practical next steps.

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When you might need this

Teams usually investigate existing foundations unknown when early warning signs start affecting reliability, compliance, or project timelines. This is often the point where decision makers move from observation into scoped technical action.

Signs and common situations

The symptoms below are the most common triggers we see before diagnosis and repair planning.

• No as-built records
• Extension or alteration planned
• Structural survey flags unknown foundations
• Need to avoid undermining existing
• Design requires assumption or investigation

What to expect from the work

Trial pits or opening up can expose foundation depth. The structural engineer then designs the new work. We deliver to the design.

How this gets resolved

We carry out investigation if specified, then build new foundations to the structural engineer's design. We do not undermine existing foundations.

Cost and complexity factors

Cost and complexity usually depend on access constraints, total scope, existing condition, and whether related works need to be coordinated in the same programme window.

What the process looks like

We keep delivery structured so scope, sequencing, and sign-off remain clear.

1. Step 1: Initial assessment

   What this step delivers: Root cause and scope are confirmed.

2. Step 2: Method planning

   What this step delivers: Practical repair strategy is agreed.

3. Step 3: Delivery and verification

   What this step delivers: Work is completed and validated.