Internal access guide
What Is a Stairwell Access Scaffold?
A stairwell access scaffold is built inside or around a stairwell void to create stable working platforms for walls, ceilings, soffits, landings and high-level internal finishes. The arrangement follows the real void geometry, floor bearing, working height, access route and platform loading.
Boarded platforms are positioned around the flights and landings so trades can work safely at the required level.
What it is
A working scaffold inside an existing stairwell
A stairwell scaffold provides a stable working platform inside or around the existing stairwell. It is different from a temporary staircase or stair tower, which is primarily used to move people between levels. The scaffold is shaped around the stairwell footprint, flights, half-landings, full landings and the workface.
Standards
Vertical tubes transfer load towards base plates, sole boards and the supporting floor or structure.
Ledgers and transoms
Horizontal members form the lifts and support boarded working areas around the void.
Platforms
Boarded areas are set to suit walls, ceilings, soffits, stringers, landings and returns.
Guardrails
Guardrails, midrails and toe boards protect platform and stairwell void edges.
Bracing
Bracing helps keep the arrangement stiff and stable inside the confined void.
Base support
Floor bearing, finished surfaces and load distribution must suit the scaffold support.
Where it is useful
High walls, ceilings, landings and internal services
Decoration and finishes
Stable access to high walls, returns and difficult areas above stair flights.
Over-stair ceilings
Working platforms for plastering, painting, lighting and ceiling repairs.
Landings and soffits
Access around half-landings, full landings, soffits and awkward returns.
M&E work
Controlled access for high-level electrical, mechanical and lighting tasks.
Window openings
Access to high-level stairwell windows where ladder work would be unsuitable.
Refurbishment
Longer-duration internal works where a repeatable platform is more practical than short-duration access equipment.
Planning the stairwell
Measure the actual void, not just the floor-to-ceiling height
The correct arrangement depends on void size, stair pitch, landing dimensions, finished surfaces, base support, platform level, material movement and whether the stairs need to remain partly usable during the works.
- Stairwell footprint, flights, landings and returns.
- Working height and the exact workface.
- Bay layout and available bearing positions.
- Floor bearing, base plates, sole boards and sensitive finishes.
- Platform loading for people, tools and materials.
- Open edges, guardrails, midrails, toe boards and access openings.
- Bracing, tying, buttressing or design input where required.
- Material route into and out of the stairwell.
Technical route
Which guidance may apply?
There is no single arrangement that covers every stairwell. The relevant route depends on whether the scaffold is tube-and-fitting, system scaffold, a small birdcage-style arrangement or a more unusual structure requiring design input.
TG20:21
Relevant where a tube-and-fitting arrangement falls within recognised compliance guidance.
BS EN 12811-1
Working scaffold performance, platform loading and access-scaffold principles.
TG21:20
Design input for arrangements outside the standard route because of height, geometry, loading or support.
TG30
Relevant where the access scaffold is formed using system scaffold.
TG4:25
Relevant where ties, anchors or anchorage form part of the stability arrangement.
SG25:20
Relevant where ladders, stair towers or scaffold access and egress need to be considered.
Choosing the method
When another access method may be better
A stairwell scaffold is useful where a proper working platform is needed, but short local tasks or different movement requirements may point to another method.
- A podium or small tower may suit short low-level tasks.
- A birdcage-style arrangement may suit a broad open stairwell void.
- A stair tower or temporary staircase is different when the main requirement is access between levels.
- Sensitive finishes can affect whether scaffold support is practical.
- Irregular flights, tight returns or high voids may need specific design input.
Common questions
Stairwell scaffold FAQs
Is a stairwell scaffold the same as a stair tower?
No. A stairwell scaffold is normally a working scaffold inside an existing stairwell. A stair tower or temporary staircase is usually used to provide access between levels.
Is the technical name stairwell access scaffold?
Yes. Stairwell access scaffold is the clearest technical description; the shorter site term is stairwell scaffold.
Can a stairwell scaffold be a birdcage scaffold?
Sometimes. If a broad internal platform or grid-style arrangement is needed, the layout may be closer to a small birdcage scaffold.
Does a stairwell scaffold always need a design?
No. A standard arrangement may be suitable in some cases, but unusual height, loading, geometry, support conditions or stability requirements can require specific design input.
Need a stairwell scaffold assessed?
Send the stairwell photographs, dimensions, working height and scope. BlackFox can review whether a stairwell access scaffold is the right method for the work.