The London Borough of Richmond upon Thames is locked in an escalating hydrogeological crisis. Bordered and intersected by the River Thames, Beverley Brook, and the River Crane, the borough faces intense fluvial and tidal flood risks. Compounding this, the rampant paving of front gardens and the mass construction of deep rear extensions over the last two decades has obliterated the natural, soil-based absorption capacity of the borough. Richmond planners now leverage the planning application process to forcibly weaponize private development against surface-water flooding via Sustainable Drainage Systems (SuDS).
If you submit a planning application for an extension, a basement, or significant hard-standing in Richmond without a highly-engineered SuDS strategy aggressively embedded into your architectural drawings, the application will be instantaneously invalidated by the council’s flood review officers.
The Disconnection Mandate
Historically, rainwater falling on roofs or patios was funnelled directly into the combined public sewer network. This practice is now fundamentally prohibited for new developments in Richmond. The council operates a strict "Discharge Hierarchy." Your architect must prove that it is mathematically impossible to discharge water directly into the ground before they will permit a throttled connection to the straining Thames Water sewer network.
If an application proposes replacing a planted front or rear garden with vast swathes of impermeable concrete, tarmac, or sealed porcelain tiling without an integrated attenuation system, it will receive an immediate veto. Planners consider the rapid shedding of surface water from private property onto the public highway or into overloaded sewers to be an unacceptable civic threat, triggering immediate refusal on flood-risk grounds.
Engineering SuDS into High-End Architecture
SuDS is not a singular product; it is a holistic architectural methodology. Elite architectural practices deploying high-end extensions in Richmond utilize several invisible, highly technical strategies to satisfy water volume calculations:
- Cellular Soakaways: Digging massive, crate-based attenuation tanks deep beneath the remaining rear garden. These tanks capture thousands of litres of torrential rainfall from the new extension roof and trap it underground, allowing it to slowly percolate into the Richmond clay over several days.
- Blue and Green Roofs: Standard flat roofs on rear extensions are highly discouraged. Planners aggressively prize "Green Roofs" (sedum planting that acts as a natural sponge) or "Blue Roofs" (engineered voids on the roof deck that deliberately hold back storm water, releasing it via a micro-calibrated flow restrictor).
- Permeable Sub-Bases: All newly designed driveways or vast patios must utilize permeable jointing and sit atop deep, engineered gravel sub-bases designed specifically to hoard water before it strikes the public drainage infrastructure.
Official Richmond upon Thames Council Resources
Before committing to any major architectural project, we strongly advise cross-referencing your ambition directly with the local authority. The following links provide direct access to Richmond upon Thames Council's live planning portals and heritage registries:
- Richmond upon Thames Planning & Building Control Portal
- Search Live Richmond upon Thames Planning Applications
- Richmond upon Thames Heritage, Conservation Areas & Article 4 Directions
How We Can Help
If you are considering a major refurbishment, extension or basement in Richmond upon Thames, our in-house architectural and construction teams are highly experienced with the specific constraints and policies of this council. Do not leave your planning application to chance—our Planning & Permissions and Architecture services are explicitly designed to handle strict London authorities from initial conceptual design through to final, legal consent.
Once permission is secured, our Refurbishment & Interiors division carefully manages the execution, guaranteeing the design integrity is maintained throughout the build phase.
Official Richmond upon Thames Council Resource
Verify the latest planning policies, application fees, and validation requirements directly via the official council portal.
Visit Richmond upon Thames Planning Portal →*Published in the Hampstead Renovations Planning Guide Collection — delivering expert design and build strategies for London's most heavily guarded conservation boroughs.*