Designed shell · Coordinated services · Ready room
Wandsworth Loft Conversion
We build loft conversions in Wandsworth from the client’s architect and engineer information. Where the design includes a bathroom, we plan its structure, drainage, ventilation and waterproofing as part of the build rather than treating it as a late fitting choice.
- Check the structure, stair and intended service routes
- Build the approved roof and floor before first fix
- Complete bathroom and room finishes in the agreed order
Client drawings set the work
Wet services planned before boarding
Specialists test their installations
Final room and access route reviewed
Define the loft room and any bathroom together
A bathroom changes more than the fittings list. It can affect floor build-up, drainage route, water supply, extraction, heating and waterproofing. We review the intended room use and the architect’s plans with the client, then write the structural, roof, stair, specialist and finishing tasks into separate parts of the quotation. We work from the client’s design team; our company does not provide architectural plans or assume that every property can accept the same layout.
Service-aware construction order
| Point | Our site work | Specialist check |
|---|---|---|
| Survey | Compare roof and service routes | List hidden connections |
| Structure | Form floor and opening | Engineer resolves clashes |
| Roof | Complete weathered shell | Check external junctions |
| First fix | Make routes accessible | Trade installation and tests |
| Finish | Waterproof, board, fit and decorate | Review operation and records |
Trace the structure and existing services
We measure accessible roof height and the proposed stair route, look at visible supports, old roof work and moisture signs, and inspect the rooms below. Existing water, waste, heating and electrical routes are noted where visible. A viable bathroom connection is not established solely by seeing a nearby pipe; the specialist must review the route and design. We list concealed conditions for controlled opening-up and refer support capacity to the engineer.
Bathroom and room interfaces
| Element | Preparation | Completion check |
|---|---|---|
| Bathroom floor | Confirm structure and falls | Waterproofed finish |
| Extraction | Plan duct and outlet | Air path and operation |
| Roof lining | Install specified layers | Continuous insulated surface |
| Stair landing | Set guarding and edges | Safe connection |
| Room floor | Prepare new substrate | Stable covering transition |
Check the information each trade will need
The architect’s current plans, structural design and property-specific approvals are reviewed before construction. We look for the designed floor support, roof geometry, stair, insulation, fire and acoustic details, plus bathroom service and ventilation information where relevant. Missing routes or penetrations are resolved with the responsible designer and installer before framing or boarding. The project schedule records inspection points and who arranges them. We build the agreed design and do not submit architectural applications.
Protect the home and order work by dependency
We protect the access route, agree storage and waste collection, and identify supplies that may need safe isolation. The work plan places structural and roof operations before service first fix, and service checks before linings. Roof opening is coordinated with framing, coverings and temporary weather protection. If the home remains occupied, we discuss periods when the landing, bathroom or utilities are affected, then arrange the sequence around agreed access.
Create the new floor and weathered roof
We expose the engineer’s specified bearing locations, compare them with the building and install the designed supports and joists. The stair opening is formed within that system and left available for the required check. Any unexpected masonry or timber condition returns to the engineer. Approved roof alterations are built to the architect’s form, with framing, coverings, flashings and rainwater details completed before sensitive internal work.
The bathroom position is checked against the built floor before routes are fixed. Structural members are not cut for pipes or cables without an approved detail. This coordination avoids a finished floor that cannot accommodate the services shown on the room plan.
Connect the new level without an awkward threshold
We verify the approved stair opening against the existing landing, nearby doors and available headroom. The specified flight, handrail and guarding are fitted after critical built dimensions are checked. Surrounding plaster and flooring are made good in the quoted extent. A change to stair position can alter structural members and circulation, so it is referred to the client’s design team before any opening is shifted.
First fix the bathroom and room services
Qualified installers review water, waste, heating, electrical and ventilation routes in the open shell. We coordinate access to their first fix and any designed penetrations, then check that insulation and lining plans still work around the routes. The bathroom’s waterproofing system and extraction are prepared before tiling and final fitting. Installers test their own services and provide records; we keep those responsibilities clear in the project file.
Close the shell and complete the finishes
After the required structural, roof and specialist checks, we install the specified insulation and lining layers at slopes, eaves and window reveals. Boards and plaster are completed, then the room floor is prepared for its finish. In a bathroom, waterproofing precedes tile or panel fitting, and sanitary items follow the agreed sequence. Doors, storage, skirtings and decoration are measured to the built room.
Fresh paint and flooring are protected while the final electrical and plumbing fittings are installed. We check service access, door operation and cleaning around bathroom fixtures so the room is practical to use, not simply photograph-ready.
Who resolves the question
| Question | Our role | Appointed party |
|---|---|---|
| Roof approval | Build agreed external form | Architect checks consent |
| Floor load | Install designed supports | Engineer calculates |
| Drainage route | Coordinate openings and fitting | Plumber designs/tests connection |
| Electrical work | Schedule first and final fix | Electrician tests circuits |
| Inspections | Expose required stages | Assigned inspector reviews |
Test the interfaces and review the work
The closing check covers roof and window junctions, stair and guarding, floor transitions, joinery, plaster and paint. Where a bathroom is included, we review visible waterproofing edges, fittings, extraction operation and the specialist records. We also inspect affected rooms below and list making-good items. Building-control and installer documents are reconciled with the agreed responsibility schedule; we identify any outstanding record rather than imply it exists.
The Wandsworth property sets the service route
The client’s architect checks the actual address and proposed roof work for permissions and other consents. We survey the house for construction access and existing service connections. The price depends on engineered structure, roof alteration, stair, bathroom complexity, specialist visits and finish choice. We do not attach a universal Wandsworth cost or timeline to unlike properties.
Questions about loft construction in Wandsworth
Can a Wandsworth loft include an en-suite bathroom?
It can if the client’s design and the property’s service routes support it. We review drainage, water, extraction, floor build-up and waterproofing before including it in the construction scope.
When is the bathroom drainage planned?
Before structural and lining details are finalised. The qualified installer reviews the route with the engineer’s floor and the architect’s layout so it does not require unapproved cuts later.
Do you provide the architect or structural engineer?
No. The client supplies architectural and engineering information. We construct the agreed scheme and coordinate the relevant trade work on site.
What if a pipe route conflicts with a beam?
We stop that interface and obtain a design response from the engineer and specialist installer. We do not notch or move a load-bearing member by site guesswork.
How is the roof made ready for interior work?
The approved framing, coverings, flashings and rainwater junctions are completed and checked. Insulation and plaster finishes follow within a secure, dry shell.
When can bathroom tiling begin?
After the substrate, waterproofing system and relevant service first fixes are complete and checked. Tiling is a finishing operation, not a substitute for the layers behind it.
Who tests the new electrical and plumbing systems?
The appointed qualified trades test their respective installations and provide the appropriate records. We coordinate their timing and check that documentation responsibilities are clear.
What is included in the final review?
We inspect the loft, bathroom where included, stair and affected rooms below. Visible finishes, fittings, extraction, specialist records and outstanding adjustments are checked against the agreed scope.
Plan the Wandsworth service sequence
Bring the architect’s loft layout and any bathroom information. We will survey structure, drainage and access before pricing.