Structural Steel (RSJs) vs. Concrete Frames

1. The Goal: Maximizing Lateral Space

The core objective of a Full Refurbishment in the London Borough of Hammersmith & Fulham (LBHF) is almost always to obliterate the maze of tiny, dark Victorian ground floor rooms and replace them with massive, unbroken open-plan "super-rooms." This requires removing highly load-bearing masonry walls.

2. The Standard Solution: The Steel RSJ

The standard architectural approach involves "Rolled Steel Joists" (RSJs or I-beams). The builder installs "Acrow props" (temporary steel columns) to hold up the first floor, smashes out the ground floor brick wall, and cranes in a massive steel beam horizontally over the ceiling aperture to carry the immense weight above. The beam itself rests on heavy steel vertical columns or brick piers embedded in the party walls.

3. The Crane and Logistics Nightmare

The primary barrier to heavy steel in LBHF is Highways logistics. You cannot manually lift a 3-ton, 6-meter-long steel I-beam. You require a heavy-duty crane. If the property sits on a narrow, heavily parked street in Fulham, deploying a crane requires suspending massive parking bays, triggering severe Construction Traffic Management Plan (CTMP) headaches with the Planning Directorate.

4. The In-Situ Concrete Alternative

If steel craning is impossible, Hampstead Renovations occasionally utilizes "In-Situ Reinforced Concrete" frames. Instead of hauling pre-set heavy beams, the builders construct intricate timber molds (shuttering) within the house. They build a dense cage of lightweight steel rebar inside the mold, and then pump liquid concrete through a long hose directly from a lorry on the main road.

Once dried, the structural frame is virtually indestructible. This method is incredibly common in deep basements but is increasingly used above ground when access makes steel unviable.

5. Building Control and Steel Fire Protection

Steel, if exposed to the heat of a severe house fire, will rapidly lose its structural integrity, warp, and cause the building to instantly collapse. Therefore, Building Control mandates that every single piece of structural steel must be either coated in expensive "Intumescent Paint" (which foams up under heat to protect the metal) or heavily boxed in with a minimum of two layers of pink, fire-resistant plasterboard (Fireline).

How We Can Help

If you are considering a major refurbishment, extension or basement in Hammersmith & Fulham, our in-house architectural and construction teams are highly experienced with the specific constraints and policies of LBHF. Do not leave your planning application to chance—our Planning & Permissions and Architecture services are explicitly designed to handle strict London authorities from initial conceptual design through to final, legal consent.

Once permission is secured, our Refurbishment & Interiors division carefully manages the execution, guaranteeing the design integrity is maintained throughout the build phase.

*Published in the Hampstead Renovations Planning Guide Collection — delivering expert design and build strategies for London's most heavily guarded conservation boroughs.*