More space and a warmer house, from one structural programme.

This structural renovation in Watford focused on expanding internal living space while improving how the house performs. The client wanted a full reconfiguration of the layout, which meant removing a load-bearing wall, installing new structural steelwork and adding a loft build to create genuinely usable rooms at the top of the house.

Alongside the structural work, the project included a thermal envelope upgrade covering insulation, airtightness and long-term energy efficiency. Running both together is the decision that defines this project.

The house worked against the way the family used it. The ground floor was divided by a wall that could not simply be knocked through, and the roof space was dead storage rather than living accommodation. The client wanted open-plan living below and real rooms above.

They also wanted the house to be cheaper and more comfortable to run. That is a separate ambition from a layout change, and it is normally treated as a separate job.

Removing a load-bearing wall is not a demolition task. It is a load transfer: everything the wall was carrying has to be picked up by new structure, and the house has to be supported throughout the changeover. That requires temporary works designed for the actual loads, not improvised propping.

Adding a loft build at the same time compounds it, because the loft imposes new loads on a structure that is being altered underneath it. The two cannot be designed in isolation from one another.

The thermal envelope upgrade then adds a third requirement running through both. Insulation and airtightness only work as a continuous layer. Every new steel, every new opening and every junction created by the loft build is a potential break in that layer, and each one has to be detailed rather than filled in afterwards.

We worked closely with structural engineers from the outset so the wall removal, the new steelwork and the loft build were designed as one structural scheme. That is what allows the steel sizes and connections to account for the loft loads rather than being sized for today and revisited later.

On site, the sequence was driven by that design. Temporary support was installed and verified before anything was taken out, the beams were set and connected before the temporary works came down, and each stage was checked against the engineer’s design and building control requirements before the next began.

The thermal upgrade was detailed alongside the structure rather than after it, so insulation continuity and airtightness were resolved at the junctions while those junctions were still open and reachable.

On a structural job the order of operations is the method. This is how the work was staged.

The completed project transformed the internal flow of the property, delivering the open-plan ground floor and the additional storey the client wanted, with a clean, modern finish throughout.

Because the thermal envelope was upgraded in the same programme, the house is not simply larger. It is more comfortable and more economical to run than it was before the extra space was added, which is the opposite of the usual outcome when a home is extended.