Basement Impact Assessment Reports

We offer a range of structural survey quotes and reports to meet your project’s requirements. See below to find out more about the main services we can provide.


Basement Impact Assessment Reports

Many local authorities within Greater London and its suburbs require a basement impact assessment (BIA) report as part of the planning permission application. This is required to review the impacts on flooding, surrounding structures and the local geology to ensure any known risks are mitigated.

The geological strata typically found within London is of clay formation and is prone to seasonal shrink and swell leading to subsidence and heave. In exaggerated cases this can lead to movement of the foundations and ultimately the superstructure above. The specific ground conditions within the vicinity of the property should be taken into consideration to assess any potential issues during or after the construction of a new basement.

Another key area of the assessment report is to understand and record the proximity of the development to public footpaths and buildings. Any works undertaken must be fully hazard and risk assessed with  proper structural surveys.

One of the most undesirable factors in the construction of a new basement is the presence of groundwater. Understanding the surrounding soil and water table is key to a successful project. If a high water table is present but is known in advance of the commencement of the construction, suitable measures can be put in place to control this from affecting the project and the surrounding area.

Full BIA requirements can vary between each local authority and between each particular project but usually includes the following:-

  • Site inspection visit to review requirements specific to project,
  • Description of Existing Structure,
  • Ground conditions/geology,
  • Research into British Geological Survey maps & borehole data in surrounding area,
  • Potential ground movements to adjoining properties,
  • Assessment of Party Wall Matters,
  • Temporary construction works and methodology,
  • Indicative programme of works,
  • Control of noise, dust and vibration statement,
  • Flood risk assessment,
  • Drainage review,
  • Trees impact review.
  • Full structural surveys

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Structural Survey Quote

To obtain a quote we need the property address, project brief in writing and any other relevant information such as other survey reports and floor plans.

Contact us by phone, email or by filling up the quick enquiry form to obtain a quote.

Indication of fees*:

  • Full Structural Surveys & Structural Engineering Reports start from £750+VAT ~ £1000+VAT or above. If you are looking for a building survey please contact us to discuss costs.
  • Basement impact assessment reports from £1900+VAT or above.
  • Method statements start from £750+VAT or above.

*Structural Survey Quotes do vary from project to project so best thing is to contact us to obtain a quote specific for your needs.

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Case studies

View Project

Bromley BR2

Domestic refurbishment and internal alterations to a three-storey semi-detached house.


View Project

Waltham Forest 04 London E17

Domestic refurbishment and extension.

View Project

St. Margarets 01 Twickenham Richmond upon Thames TW1

Domestic refurbishment and extension.

Why choose us?

With over 3000 successfully completed projects to date, we have consistently proven ourselves to be a leader in the industry. From design cross check procedures to quality control measures, we will ensure your project is completed to your exact specifications.

100% Success in Building Regs

Fully Qualified SE

Transparent Fees

Practical & Efficient Designs

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Fast Turnaround



You can view from drop down menu below some of the most frequently asked questions. Feel free to contact us if you cannot find answers you need.

The cost of a report should range depending on what is required from the engineer to inspect and report on. Usually for a London domestic property of 3 bedrooms you should expect a range of between £750+VAT - £850+VAT. For larger domestic properties such as 5 bedrooms detached houses expect the cost to rise up to £1500+VAT or more depending on scale.
A structural engineer can help with specifying structural elements required for altering an existing building or creating a new one. This can be done by doing drawings & calculations to support the build and comply with building regulations (part A – Structure). A structural engineer can also prepare a structural report as a specialist on structural defect issues such as subsidence, movement and cracking etc. A surveyor role can be diverted to carry out general building surveys on the overall condition of the building, provide valuations or act as an expert witness to resolve a dispute. Party wall surveyors can also help with sorting out party wall disputes and ensuring compliance with party wall act.
If you have concerns about a structural defect within your property then you should hire a structural engineer to visit and inspect your property and advise you whether the defects are ongoing, historic and whether they are serious or minor. Also if you are preparing to embark on structural works within your property such as creating an extension or loft conversion or even knocking down walls or chimney breasts, it is always recommended to hire a structural engineer to make an inspection and prepare the necessary drawings & calculations to confirm which walls are structural and how to create support required to achieve your aspirations.
Yes, we have a list of reputable building contractors and could potentially make a recommendation for your specific project.
This will depend on many design factors and parameters and there is definitely no one set answer. For example a solution to reduce beam weight might be done by choosing two lighter beams instead of one beam or by changing architectural layout and inserting a column somewhere along the span of the beam or by changing the structural layout of the beams, etc. The options can be endless so best to discuss specific requirement with the project engineer with open mind that each project is different and solutions can vary from project to another.
Cracks in walls, ceilings and floors are caused by several different reasons. Depending on the size, exact location and frequency of the cracks, the risks associated can vary substantially. Subsidence or movement of foundations can often cause cracking and structural damage to the building above. There are often a variety of causes for these movements and the investigation and remediation can vary based on the cause and associated risk.
If construction work is proposed in a project, involving altering the existing structure, adding significant loads or building a new structure, then you will need a structural engineer. If you are unsure whether the alterations are structural (such as whether a wall is load bearing or if removing a chimney has structural implications) then you will also need advice from a structural engineer.