Load path agreed · Roof weathered · Space completed
Streatham Loft Conversion
We build full loft conversions in Streatham to the plans supplied by the client’s architect and engineer. The structural floor is considered first, because every later operation depends on a sound and correctly located support system.
- Inspect the house and designed structural support points
- Construct floor, roof alteration and stair in sequence
- Coordinate services, linings, joinery and final checks
Engineer’s scheme governs structure
Unexpected bearings referred back
First fix planned before enclosure
Completed room reviewed downstairs too
Set out the load-bearing and room scope
A loft room requires more than a better finish to the existing attic. The engineer specifies how new loads reach the building below; the architect sets the room, roof and stair design. We review those documents at the house and set out the work we will construct, the specialist installations and the interior products. The written quotation states the extent of opening-up and making good. We do not supply architectural plans or claim every Streatham loft has the same structural solution.
Structural sequence and checks
| Stage | Operation | Decision or hold |
|---|---|---|
| Survey | Identify possible support lines | Engineer reviews unknowns |
| Open-up | Expose designed bearings | Compare masonry with plans |
| Floor | Install supports and joists | Inspect before covering |
| Roof | Frame approved alteration | Complete weather junctions |
| Finish | Line, fit and decorate | Collect trade documents |
Check visible supports and hidden limitations
We measure accessible loft dimensions and examine visible roof timbers, walls, ceiling construction, old openings and moisture signs. The proposed stair path is followed down to the landing. We identify where drawings expect beams or joists to bear, then record what cannot be seen without opening-up. That record goes to the engineer if a site condition differs. A ceiling used for storage is not assumed to be a compliant habitable floor.
Floor-to-roof interfaces
| Element | Preparation | Finished check |
|---|---|---|
| Bearing | Expose sound location | Member seated as designed |
| Stair opening | Coordinate joists and flight | Safe guard and landing |
| Roof slope | Install specified insulation | Continuous lining |
| Service route | Check against members | Tested installation |
| Floor covering | Prepare engineered deck | Stable threshold |
Resolve structural details before demolition
The engineer’s plan must show supports, connections and any temporary works needed for safe alteration. We cross-check it with the architect’s stair opening, roof geometry and service zones. The client’s designer establishes planning and Building Regulations requirements for the address. Our schedule identifies inspection points before structural work is covered. When a designed support clashes with a chimney or hidden masonry, the responsible professional revises the detail; the site team does not choose a substitute by appearance.
Prepare safe access and controlled opening-up
We protect the route through the home, agree material storage and waste removal, and identify services that could be affected. Opening-up is sequenced so the engineer can review concealed support conditions before permanent members are installed. Roof materials and weather cover are arranged for the external stage. The household is told when access to the landing or loft will change. Protection is adjusted as the work moves from structural members to boarding and finishes.
Install the new floor and roof shell
We expose specified bearings, prepare them and fit the designed beams and joists. The stair opening is formed within the engineered arrangement; alignment and connections are checked while visible. If the existing wall or timber differs, work pauses for an engineer’s instruction. Once the floor is established, the approved roof alteration is framed in sequence, with retained structure supported as specified. Coverings, flashings and rainwater junctions are completed so the new room can be enclosed in a dry shell.
The team checks levels and positions while both sides of a connection remain visible. We also compare the new deck with the designed stair and planned service routes before fixing layers that would hide the joists. These checks are recorded in the site sequence so later trades know where they can work and where a structural element must remain untouched.
Tie the structural opening to a usable stair
The built opening and landing are measured against the approved stair design before the flight is fitted. We install the specified stair, handrail and guarding, then finish the adjacent walls and floor junctions within scope. Headroom, nearby doors and arrival space are checked on both levels. Moving an opening after the floor is built requires design review, so we settle that geometry early rather than treat the stair as a late joinery choice.
Keep specialist routes clear of structure
Electrical, plumbing, heating and ventilation installers review their routes after the main members are located. We do not notch an engineered beam or joist to solve a service clash without approved detail. First fix is scheduled before insulation and plasterboard; qualified trades then test and record their work. An en-suite, where included, needs planned drainage, extraction and waterproofing, with floor build-up and roof space considered together.
Enclose and finish only after the checks
We install specified insulation and linings at roof slopes, dormer cheeks and eaves, respecting required inspection points. Boarding and plastering follow, then the new floor is prepared for its covering. Doors, skirtings and fitted joinery are measured against the completed shell. Decoration starts with filling, sanding and appropriate priming; final coats are checked in real room light. We protect finished surfaces while specialist fittings are completed.
Technical responsibility
| Issue | Our work | Specialist decision |
|---|---|---|
| Load path | Install approved members | Engineer designs support |
| Roof geometry | Build specified form | Architect confirms proposal |
| Stair dimensions | Fit designed flight | Designer sets compliant geometry |
| Electrical/plumbing | Coordinate access | Qualified trades test |
| Inspection status | Present visible work | Assigned inspector confirms |
Verify the structure-facing details and finish
The final review checks the visible roof and window junctions, stair and guarding, flooring, joinery, plaster and decoration. We revisit the lower landing and rooms used for access. Specialist test records and the building-control completion route are checked against the responsibility schedule. Any adjustment is listed and assigned. A complete looking room is not presented as proof that unreceived formal records exist.
The Streatham house determines the detail
The client’s architect checks the actual property’s planning position and any consent affecting the roof proposal. We do not infer permission, roof type or wall capacity from the area name. The quotation reflects the engineered floor, roof work, stair, services, access and finish. Unknown concealed conditions are identified as assumptions rather than priced as certain facts.
Questions about loft construction in Streatham
Is the existing attic floor strong enough for a room?
That cannot be decided by appearance. The appointed engineer assesses loads and specifies any new beams and joists; we construct that scheme after comparing it with the exposed site.
What if the specified support point is hidden?
We plan controlled opening-up, protect the area and compare the exposed fabric with the engineer’s detail. A discrepancy goes back for instruction before permanent structural work continues.
Do you provide structural calculations?
The client’s structural engineer provides the calculations and details. We install the approved support system and report conditions that differ from the design information.
How is the stair opening checked against the new floor supports?
We set out its edges from the engineer’s floor plan and compare the position with the architect’s stair and the existing landing. Joist ends, connections and guarding points are reviewed while visible, before the deck closes the structure.
Who checks permission for a Streatham dormer?
The client’s architect checks the actual address and proposal. We do not make an area-wide permitted-development claim; we build the roof alteration approved for that property.
Can wiring pass through the new joists?
The route must be coordinated with the engineer’s scheme and qualified installer. We do not drill or notch a designed structural member without an accepted detail.
What is inspected before plasterboard goes up?
Required structural, roof, insulation and specialist stages are kept visible for the assigned checks. We close the work after those decisions are recorded.
How are unexpected findings priced?
We record the condition, obtain any needed design response and agree the change to cost or programme before the affected work proceeds.
Check the designed load path on site
Share the engineer’s floor scheme and architect’s loft plans so we can compare the specified supports with the existing building.