The Pre-Build Survey Specialist in Forest Hill
Essential drainage diagnostics and mapping for Forest Hill extensions and new builds. Secure your Thames Water build-over agreement with Forest Hill’s technical experts.
- ◉ Building Control Compliant
- ◉ Precision Depth & Invert Level Data
- ◉ Fast-Track Reports for Forest Hill Developers
100% Approval
Our reports are designed to meet all Forest Hill local Council planning criteria.
3-Metre Rule
Expert identification of any public sewers within the critical Forest Hill build zone.
£5M Insurance
Fully insured for all pre-construction and site works within the Forest Hill area.
Technical Foundations for Forest Hill Construction.
In a town with as much development as Forest Hill, from modern urban expansions to sensitive suburban renovations, a Pre-Build Survey is the most critical step in your project’s lifecycle. Building over or near a sewer without professional documentation is a legal and structural risk. Our surveys provide the precise underground intelligence required to protect Forest Hill’s infrastructure and your investment. We identify the exact location, depth, and condition of pipes, ensuring your foundations are designed correctly and your Forest Hill planning application proceeds without a hitch.
Specialized Pre-purchase Drain Survey for Forest Hill Buyers
We offer a suite of specialized investigations that fulfill the rigorous technical requirements of Forest Hill structural engineers and water authorities.

Build-Over CCTV Inspection
The "Before" report required by Thames Water for Forest Hill properties, documenting the structural integrity of the sewer before any groundworks begin.
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Depth & Invert Level Verification
We provide the exact measurements Forest Hill architects need to calculate foundation depths and avoid crushing local drainage lines.
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Public Sewer Identification
Determining exactly which pipes are your responsibility and which are Forest Hill’s public assets—a critical distinction for legal build-over agreements.
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Load-Bearing Site Mapping
Mapping the drainage network to ensure Forest Hill new-build loads are distributed safely, preventing future pipe collapses or subsidence.
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Pre-Construction Structural Audit
A full condition assessment of Forest Hill pipes to identify existing cracks or leaks that must be resolved before construction equipment arrives on-site.
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The "No-Dig" Solution for Forest Hill Developers
Our solution focuses on deliveringthe hhighest-resolutiondata with zero site disruption. We ensure your Forest Hill construction project meets all Part H Building Regulations through non-invasive, high-speed diagnostics.
- ◉ Precision Sonde tracing to identify pipe direction on Forest Hill sites.
- ◉ Detailed WinCan reports accepted by Forest Hill's legal and water authorities.
- ◉ Technical advice on pipe protection and diversion for Forest Hill builds.
Non-Invasive Site Intelligence
Our Pre-Build Survey is entirely trenchless, using advanced camera technology to explore your Forest Hill site without disturbing the ground.
Forest Hill Site Prep
We identify all access points and map the build-zone relative to existing Forest Hill sewer assets.
Our engineer arrives at your Forest Hill address equipped with the latest CCTV technology.
HD CCTV Exploration
High-resolution cameras are inserted to document every joint, crack, and connection in the Forest Hill network.
Data Package Delivery
You receive a professional report containing HD video, site maps, and depth data for your Forest Hill build-over application.
What Our Customers Say
Daniel K., Forest Hill Architect
"Highly Efficient. We needed a Pre-Build Survey for a Forest Hill town-center project. They coordinated with the agent and delivered the Thames Water-ready report in 24 hours."
Megan R., Forest Hill Homeowner
"Peace of Mind. Our Forest Hill builder insisted on a survey before our extension. The team found a collapsed pipe we didn't know about, saving us thousands in potential damage."
Simon V., Forest Hill Project Manager
"Professional Data. Their mapping was millimeter-perfect. Essential for any developer working in the Forest Hill area who wants to avoid planning delays."
Why Choose Us?
We are Forest Hill’s leading pre-construction drainage authority. Our team provides the specialized technical data that Forest Hill’s professional building sector demands for every project.
Forest Hill Infrastructure Knowledge
Our engineers have years of experience working with Forest Hill’s unique drainage topography, ensuring we find assets that generic firms miss.
Advanced Diagnostic Equipment
We use the latest HD crawler cameras and sonar locators to ensure your Pre-Build Survey is the most accurate in the Forest Hill area.
Solicitor & Authority Approved
Our reports are specifically formatted to be accepted by Forest Hill local Council and Thames Water, streamlining your build-over agreement.
Fixed Forest Hill Pricing
We provide transparent, upfront quotes for all Forest Hill projects, ensuring you can budget for your survey without hidden "emergency" fees.
Rapid Site Turnaround
We know Forest Hill construction schedules are tight. We offer priority booking for pre-build projects to keep your development on track.
End-to-End Compliance
From initial tracing to final "post-build" verification, we handle the entire compliance process for Forest Hill developers and homeowners.
Secure Your Forest Hill Build-Over Approval.
Get the professional drainage data your Forest Hill project needs. Book your survey today.
Frequently Asked Questions
Why do I need a Pre-Build Survey for my Forest Hill extension?
A Build-Over Agreement is required if you are building within 3m of a public sewer in Forest Hill. It protects you and the water authority.
Will this survey satisfy Thames Water in Forest Hill?
Yes. We use WinCan reporting software, which is the industry standard accepted by Thames Water and Forest Hill building control.
What happens if you find damage during the Forest Hill survey?
We will provide a clear HD video of the damage and a fixed-price quote to repair it before your Forest Hill build commences.
Do I need a post-build survey as well in Forest Hill?
Often, yes. Water authorities in Forest Hill may require a “Post-Build” check to ensure your construction hasn’t damaged the sewer.
How long is a Pre-Build Survey valid for in Forest Hill?
Usually, these surveys are valid for 12 months, provided no significant groundworks have occurred on your Forest Hill site since the check.
Can you trace the depth of the pipe for my Forest Hill structural engineer?
Absolutely. Our Sonde and Trace technology provides the exact depth data Forest Hill engineers need for footing designs.
Do you work with Forest Hill-based architects?
Yes, we are the preferred drainage partner for many architectural firms across the Forest Hill area for all pre-construction works.
Is the survey messy or disruptive to my Forest Hill property?
Not at all. It is entirely non-invasive. We access the pipes through existing manholes on your Forest Hill site.
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We proudly serve
- • Lambeth
- • Abbey Wood
- • Blackheath
- • Brockley
- • Camberwell
- • Catford
- • Charlton
- • Deptford
- • Eltham
- • Greenwich
- • Kennington
- • Lee
- • Lewisham
- • Peckham
- • Rotherithe
- • Woolwich
- • Crystal Palace
- • Penge
- • Dulwich
- • Forest Hill
- • Sydenham
- • Thamesmead
and all surrounding Area.