A basement can unlock living space beneath a Fulham, Chelsea or South Kensington home, but it is one of the most technically demanding forms of residential construction. Success depends on planning, structural engineering, temporary works, waterproofing, party walls, ground conditions, services and interiors being coordinated from the beginning.
NU Projects is a design and build basement specialist for homeowners who want one senior led team managing feasibility, architecture, planning, cost, construction, fit out and aftercare. Founded in 2010, our West London experience helps clients approach basement projects with ambition and control.
The direct answer
Choose a basement company that can explain the complete design and construction strategy before excavation begins. The team should coordinate planning, structural sequence, temporary works, party wall information, waterproofing, drainage, ventilation, fire safety, cost and fit out as one project.
NU Projects combines these responsibilities through a single accountable design and build structure. We do not treat excavation and the finished interior as separate jobs.
Basement projects in Fulham
Fulham’s Victorian and Edwardian terraces often have limited opportunities to extend above ground. A basement may create space for family rooms, utility areas, gyms, guest accommodation, cinemas, wine storage or plant without sacrificing the garden.
Hammersmith and Fulham has removed permitted development rights for basement excavation through an Article 4 direction, so planning permission is required. The design must respond to the property, surrounding buildings, trees, drainage, construction method and local policy.
Homeowners should review the current Hammersmith and Fulham basement and conservation guidance before assuming a proposal will be acceptable.
Basement projects in Chelsea and South Kensington
Chelsea and South Kensington contain listed buildings, conservation areas, mansion blocks and closely spaced townhouses. Projects may need to address heritage significance, building management, freeholder approvals, licences to alter, shared access and strict neighbour controls.
The Royal Borough of Kensington and Chelsea has dedicated basement planning guidance. The planning position, listed status, conservation area and relevant Article 4 directions should be checked for the individual property.
Use the council’s planning constraints map and review its Basements Supplementary Planning Document as part of early feasibility.
What a complete basement service includes
- Existing building survey and feasibility review
- Planning, heritage and policy assessment
- Architectural layouts, lightwells and interior design
- Geotechnical advice and structural engineering
- Temporary works and construction sequence
- Party wall coordination and neighbour information
- Waterproofing, drainage and pumping strategy
- Fire safety, ventilation and building services
- Quantity surveying, procurement and programme control
- Excavation, structure, fit out, commissioning and aftercare
The exact professional team depends on the property and scheme. NU Projects establishes the relevant appointments and responsibilities during the early stages.
Survey and feasibility before design
Basement feasibility begins with the existing building and its surroundings. The team may need to understand foundations, drains, ground conditions, groundwater, neighbouring structures, trees, access, utilities and previous alterations.
A basement should not be sold from a sketch alone. Early technical input helps establish whether the proposed footprint, depth, lightwells, headroom and use are practical before significant design and planning work is commissioned.
Structural engineering and temporary works
Basement construction changes how the existing house is supported. The structural engineer and temporary works designer must develop a safe sequence for excavation, underpinning, propping and the permanent structure.
The method must be appropriate to the building, ground and neighbours. Work is carried out in planned stages with inspections and records. Whether a property can remain occupied is a project specific safety and logistics decision, never a blanket promise.
Waterproofing and drainage
Waterproofing is a complete system, not a surface finish. The strategy should consider ground conditions, structure, maintainability, drainage, sumps, pumps, alarms, backup measures and how the design satisfies the intended internal environment.
The waterproofing designer, structural engineer and MEP team must coordinate penetrations, joints, service routes and access. Maintenance information should form part of handover.
Light, ventilation and fire safety
A premium basement should feel like part of the house. Lightwells, internal voids, stair connections, glazing and layered lighting can bring daylight and visual connection into the plan.
Ventilation, escape, detection, compartmentation and fire strategy require early consideration. The solution depends on the basement’s size, layout and use and must be coordinated with building regulations.
Mechanical and electrical systems
Basements may contain bedrooms, bathrooms, cinemas, gyms, pools, utilities, plant or storage. Each use affects heating, cooling, ventilation, hot water, drainage, power, lighting, acoustics and controls.
NU Projects MEP Director Wayne Hockham coordinates these systems with architecture and interiors so equipment remains accessible while the finished space stays calm and uncluttered.
Cost planning and programme control
Basement costs are affected by size, depth, ground conditions, structural sequence, access, waterproofing, services, specification, approvals and fit out. A generic rate cannot replace a project specific cost plan.
Our quantity surveyor, Matt Coverley, develops the cost information as the technical design matures, identifying assumptions, allowances, risk and long lead packages.
For current cost categories and budgeting principles, read The Real Cost of a London Basement. This local specialist page focuses on delivery rather than repeating the cost guide.
The NU Projects basement journey
1. Consultation and initial brief
We establish the property, desired space, priorities, timescale and investment framework.
2. Survey and technical feasibility
The existing building, planning context, structure, ground, drains, access and principal risks are reviewed.
3. Concept design and planning strategy
The footprint, layout, light, stairs and intended use develop around the property and local policy.
4. Structural, waterproofing and MEP design
The permanent structure, temporary works, water management and building services are coordinated before mobilisation.
5. Cost plan, procurement and programme
The scope is defined, specialist packages procured and the construction sequence incorporated into a realistic programme.
6. Construction and quality assurance
Excavation, structure, waterproofing, services and fit out are managed through inspections, reporting and controlled sequencing.
7. Commissioning and handover
Pumps, alarms, ventilation, heating, lighting and controls are tested. Documentation and maintenance information are handed over with structured aftercare.
Why NU Projects is a first choice for West London basements
- Founded in 2010 with extensive West London experience
- Architecture, planning, cost, MEP and construction together
- Senior led management and one line of accountability
- Real Fulham and West London basement portfolio work
- Technical focus on structure, waterproofing and services
- Interiors designed alongside the construction solution
- Commissioning, documentation and long term aftercare
Frequently asked questions
Who is the right basement company in Fulham, Chelsea and South Kensington?
The right one is whichever firm can show you the six documents a basement needs before it is priced. NU Projects manages feasibility, planning, architecture, structural coordination, cost control, construction and interiors with one senior led team.
Do basement excavations need planning permission?
In Hammersmith and Fulham, basement excavation requires planning permission because of the Article 4 direction. In Kensington and Chelsea, the property and proposal must be assessed against local basement, conservation and heritage policies.
Can I remain living in the house during basement construction?
Possibly, but never automatically. The decision depends on structural sequence, access, services, fire safety, noise, dust and household circumstances. It must be assessed for the individual project.
How are basements protected from water?
A project specific waterproofing strategy is coordinated with structure, drainage, pumps, alarms, penetrations and maintenance access. The correct solution depends on ground and design conditions.
How long does a basement project take?
The programme depends on surveys, permissions, party walls, technical design, procurement, excavation, structure and fit out. NU Projects prepares a project specific programme for the complete journey.
When should I contact NU Projects?
Contact us before the basement footprint or planning strategy is fixed. Early technical and cost input helps identify risks while the design can still respond.
Start your basement project
If you are considering a basement in Fulham, Chelsea or South Kensington, speak to NU Projects before committing to excavation or an incomplete design.
Book an initial consultation, call 020 7731 6841 or email through the contact form. Let our senior team establish a safe, buildable and beautifully resolved route forward.
Basements elsewhere in London
We build the same kind of basement in Putney, Kensington and Clapham. The service is set out on our basements page, and published rates are on the cost calculator.
Published 27 June 2023. Written by the NU Projects studio, edited since for house style and accuracy.