Formwork

Reinforced concrete specialists for London and the South East

O'Sullivan Civil Engineering brings over 30 years of formwork and concrete experience to above and below ground reinforced concrete (RC) structures across London and the South East. Our teams work on projects ranging from complex basement retaining walls and pile caps to exposed architectural concrete finishes for prime residential, commercial and heritage buildings.

We work directly with engineers, main contractors and developers who require a specialist concrete subcontractor they can rely on for quality, buildability and programme certainty.

Formwork and RC structure services

We deliver the full range of concrete substructure and superstructure works, including:

Below ground RC structures – retaining walls, pile caps, ground beams, basement slabs and raft foundations
Above ground RC structures – columns, cores, walls, suspended slabs and transfer structures
Formwork design and installation – traditional timber, system formwork and bespoke solutions for complex geometry
Reinforcement installation – bar, mesh, post‑installed and specialist reinforcement layouts to engineer’s specification
Fair‑faced and exposed concrete finishes – architectural face concrete to specified Class or bespoke visual requirements
Waterproof concrete construction – integral waterproofing and joint detailing in coordination with waterproofing designers

Experience in complex and architectural concrete

Achieving consistent, high‑quality concrete — especially in exposed or architecturally specified finishes — demands rigorous planning of formwork, mix design, pour sequence and curing. Our teams understand the relationship between all of these variables and work closely with engineers and architects to achieve the required visual and structural performance.

We have extensive experience delivering RC structures in sensitive environments, including heritage buildings, live urban sites and high‑end residential projects where finish quality and neighbour management are equally critical

Working with structural engineers and main contractors

Structural engineers and main contractors choose us as their concrete subcontractor because we engage early, understand the design intent and manage the quality process from pour to strike

Early review of concrete specification, mix design and pour sequence
Formwork design coordination and temporary works integration
Kicker construction, joint location and construction joint detailing
On‑site quality management – including pour records, test cubes and curing monitoring
Post‑pour inspection, remediation and handover documentation