Many London Boroughs including Camden, Westminster, Kensington and Chelsea and Islington, now require Basement Impact Assessments in support of planning applications for subterranean developments.
BIA Planning is a service offered by Ground and Project Consultants in association with Hannah Fraser Consulting Ltd.
With our expertise in geotechnical engineering, hydrogeology and environmental consulting we provide a highly effective one-stop shop for structural engineers, architects, planners, developers and property consultants to support basement applications.
Specialist knowledge and skills required for Basement Impact Assessments
We have an in-depth understanding of the geology, hydrogeology and environmental issues for each authority and the particular emphasis which different London Boroughs place on planning applications for Basement developments.
Our approach is to offer a service focussed on customer needs and Planning Authority expectations.
Key features of our service include:
- A Fixed Fee offering
- High quality reporting
- A tailored and proportionate approach for each project
- Proactive customer service
We have a proven track record in gaining planning permission and excellent skills in liaising with planners and other regulators.

Jon Smithson
We offer a full range of earth and environmental consultancy services for basements:
- Hydrogeology/Groundwater
- Geotechnical/Geological
- Hydrology/Flood Risk
- Tree Impact Assessments
- Noise, Dust and Vibration
- Contaminated Land

Hannah Fraser of HFraser Consulting
BIA Planning is run by Jon and Hannah who are both Chartered Geologists, a key requirement of many authorities.
We have nearly 50 years’ professional experience between us and are fully conversant with the delivering requirements of each London Borough.
Hannah and Jon are one of the key lynch pins in the production of Croft’s BIA planning reports. Their expert advice is crucial in dealing with the complicated planning process.
We have not had one report fail planning when Hannah and Jon are involved.
Chris Tomlin
Director, Croft Structural Engineering, SE London