Flood & Water
Foul Drainage Assessment (FDA1)
Waste-water drainage assessment, including the FDA1 form.
At a glance
- Accepted by planning authorities UK-wide
- Fixed fee, quoted up front
- Fast, reliable turnaround
- One accountable point of contact
What it is
A foul drainage assessment establishes how waste water from your development will be dealt with — mains connection or a private system — and confirms its suitability.
When you need it
Often required for rural, off-mains or septic-served sites, using the Environment Agency FDA1 form.
What you get
What's included
Foul drainage options appraisal
FDA1 form completion where applicable
Package treatment plant / septic suitability review
Supporting statement for planning
Not sure whether you need a Foul Drainage Assessment?
Send us your site postcode and a brief description of your proposed development, and we'll tell you whether a Foul Drainage Assessment is likely to be required and what level of assessment your site may need — usually within a day, at no cost.
How it works
From quote to consent
Share your site
Send the postcode, plans and any council correspondence — we confirm scope and fee up front.
We assess & value-engineer
Our specialists prepare your Foul Drainage Assessment, finding the most cost-effective route that still satisfies the regulator.
Consent-ready report
A clear report the authority will accept, with us on hand for any queries or conditions.
FAQs
Frequently asked
What is an FDA1?
A standard foul drainage assessment form used where a development isn't connecting to the main sewer.
Do I need one?
Typically if your site is not on mains drainage, or the council has raised foul drainage as an issue.
Related services
More in Flood & Water
Flood Risk Assessment (FRA)
Site-specific flood risk assessments, with proportionate mitigation and no unnecessary cost.
View service →SuDS Design & Drainage Strategy
Sustainable drainage designed to meet LLFA requirements — proportionate, practical and cost-conscious.
View service →Surface Water Drainage Report
Runoff calculations and drainage design for planning.
View service →Tell us about your site
Send us your location and plans for a fast, fixed-fee quote — and honest advice on exactly which reports you do and don't need.