Complete design & build
SEM Group brings architectural design, technical planning and construction together in one complete service across London and Surrey.
How we can help
Choose the service that best matches your plans, or ask us to manage the complete journey. We can coordinate architectural drawings, planning, structural calculations, Party Wall matters, Building Control and construction through one experienced team.
A complete design-and-build service that takes your project from the first idea through approvals, technical coordination and construction.
Rear, side-return, wrap-around and double-storey extensions planned around your property and family life.
Dormer, hip-to-gable and rooflight conversions that create comfortable, compliant new living space.
Complete home and commercial renovations with one team coordinating the programme from strip-out to decoration.
Carefully managed new-build delivery with clear sequencing, quality control and coordination across every trade.
Practical, refined kitchens and interior spaces delivered with accurate installation and close attention to detail.
Complete bathroom and shower-room installation, from plumbing preparation and tanking to tiling and fittings.
Insulated garden offices, studios and outdoor rooms designed for productive, comfortable year-round use.
Refurbishments and fit-outs for commercial spaces, organised around programme, access and operational requirements.
Indicative construction only. Final floor layers, insulation thicknesses and heating design are subject to site conditions, heat-loss calculations, Building Control requirements and the approved technical specification.
Insulated floor upgrades
Wet underfloor heating distributes warmth evenly across the floor, helping larger rooms and open-plan extensions feel consistently comfortable without relying on wall-mounted radiators.
Because a correctly designed system can operate at a lower water-flow temperature than conventional radiators, it can improve heating efficiency when paired with suitable insulation, responsive controls and an efficient boiler or heat pump.
Potential energy savings vary with the property's insulation, heat source, controls, energy tariff and how the heating is used.
Discuss your floor upgrade →One accountable team
From surveys and drawings to structural design, Party Wall matters, approvals and the finished build, we keep every stage connected and clearly managed.
Book a consultation →Have a project in mind?
Tell us about your property and plans. We’ll arrange a complimentary, no-obligation consultation.
Start your project →Or email info@semgroup.uk