Converting offices into homes: scaffolding the project

Empty office buildings have become a familiar sight in many cities, and converting them into flats is one way of turning vacant floor space into homes. From London and Dublin to Rotterdam, Frankfurt or Toronto, owners and developers are taking on such projects. Almost every conversion involves facade work, new windows, roof work and new services, which means a scaffold standing for many weeks or months. And unlike a simple repaint, the scaffold has to serve several very different trades, inside and out.

What a conversion typically involves

An office building is designed for deep floor plates, open-plan workspaces and mechanical ventilation. Homes need daylight in every room, opening windows, balconies, separate services and better sound insulation. The work that follows shapes the scaffold:

• Facade: replacing curtain walls or ribbon windows with residential windows, adding insulation, new cladding or render.
• Balconies and openings: cutting new openings in the facade and floor slabs, fitting balconies or loggias.
• Roof: renewing the roof, adding plant, often a rooftop extension with one or two new storeys.
• Cores: new stairs, lifts and service risers through existing slabs.
• Interior: strip-out, new partitions, ceilings, sprinklers, electrical and plumbing work at height.

Which scaffold for which part of the job

Facade scaffold

For new windows, insulation and cladding, a facade scaffold is the first choice. Office buildings from the 1960s to the 1990s often have straight, regular elevations, which suits frame systems well. When insulation is added, the finished surface moves outwards; plan the wall distance and inside brackets from the outset, together with ties long enough to pass through the new build-up. More in scaffolding for external wall insulation.

Ties are a particular issue on office buildings. Curtain walls and glazed facades cannot take tie forces; ties go into the concrete slab edges or columns behind. Where whole facade sections are removed, the tie pattern has to be planned around the openings in advance.

Modular scaffold

Many office buildings have podiums, set-back upper floors, projecting stair cores or rounded corners. A modular scaffold follows these shapes and can bridge entrances with lattice girders so that the ground floor stays usable.

Roof and rooftop extensions

If one or two storeys are added on the roof, the facade scaffold has to grow with the new structure. Plan the height grid for the final eaves or parapet level and make sure the existing building can take the additional ties. During roof work the top lift serves as a catch; see roofing scaffolding.

Shoring and back-propping

As soon as structural changes are made, temporary support becomes part of the scaffold package. Typical cases:

• cutting new openings in slabs for stairs, lifts or risers,
• removing or altering walls and columns,
• back-propping slabs below a rooftop extension during construction,
• supporting balcony connections until they are complete.

For moderate loads, floor props carry the slab; for higher loads and greater heights, shoring towers are used. Falsework and shoring follow EN 12812 and always need a structural engineer's design that shows the load path down to the foundations.

Interior work at height

Office floors often have clear heights of around 2.70 to 3.50 m, entrance halls and atria considerably more. For ceilings, sprinkler pipes, cable trays and ventilation ducts, aluminium mobile towers to EN 1004 are the standard tool. In atria and double-height spaces a birdcage scaffold gives a continuous working level across the whole ceiling.

Check three things before ordering interior equipment: the floor capacity (especially on raised access floors, which are often removed first), the size of doors and lifts through which parts must pass, and the routes for removing strip-out waste. Light parts in short lengths save hours of carrying.

City-centre logistics

Most conversions take place in dense urban areas, often with the building fronting directly onto the pavement:

• Permits: in Britain the local highway authority grants the licence for any scaffold on the public highway; in other countries the city or municipality sets the conditions. See scaffolding on the pavement or road.
• Pedestrian protection: protective fans, boarded lifts and covered walkways keep people safe below.
• Deliveries: loading bays and delivery slots are limited; order material in sorted, labelled loads.
• Neighbours: in tight streets the scaffold may need to stand on adjoining land; agree it in writing.
• Security: an empty building with a scaffold invites intruders; see protecting scaffolding against theft.

In the UK, conversions are construction projects under CDM 2015, with a principal contractor coordinating the trades on the scaffold. Elsewhere, national construction safety rules apply.

Long standing times: steel, aluminium and buying

A conversion scaffold often stands for several months. For the exterior, galvanised steel systems are robust and well suited to long standing times; used Layher, Hünnebeck and Altrad Plettac frame systems are common choices. Aluminium makes sense indoors and wherever parts must be carried by hand. The comparison is set out in aluminium or steel scaffolding.

Over such periods, buying used material is often cheaper than hiring. Indicative figures from October 2026: a complete used frame scaffold is roughly €30–40/m² and the new CETRAC SPEED around €33–40/m², each net, VAT added. Rebuy lowers the net cost too: whatever you bought from CETRAC, if it comes back technically perfect within five years, is repurchased for 85 % of its list price. Measure the elevations and let the scaffolding calculator do the rest, or mail us drawings for a quotation.