GRANDHOME
CONSTRUCTION
Certified home extensions London — single-storey, double-storey, and side-return builds, delivered by our own qualified trades from first survey to final sign-off.
Home extensions London projects only work when the new build ties seamlessly into the existing structure — in materials, in layout, and in how the light and flow of the house come together.
We start with a full assessment of your existing footprint, boundaries, and planning requirements. From there our team proposes the right extension type — single-storey, double-storey, or side-return — along with structural design, foundations, and finishing, with structural calculations and building control sign-off handled throughout.
Every job is quoted in full before work begins — materials, labour, and structural work all itemised, with no surprise additions once the job is underway.
Whether it's a side-return extension or a full double-storey build, every project gets the same process.
Structural builds sized to the space and budget your project needs.
Builders, electricians, and plumbers all coordinated by our own project team.
Structural calculations, building control sign-off, and planning where required.
One itemised price agreed before work starts — no hidden extras.
Materials and detailing matched to the existing property for a natural join.
Workmanship covered well beyond handover, if anything needs attention.
We assess your existing footprint, boundaries, and planning requirements.
Extension design, structural planning, and one fixed, itemised quote agreed before anything is ordered.
Groundwork, foundations, and structural build carried out to the agreed design.
Insulation, plastering, electrics, and plumbing installed and tested.
Building control sign-off completed, and your new space ready to use.
Single-Storey ExtensionDouble-Storey ExtensionExtension Fit-OutThe cost of home extensions London projects depends on the size and type of extension, the existing structure, and whether planning permission is needed — a single-storey side-return runs very differently to a full double-storey rear extension. Rather than quote a generic figure that won't hold up once we see your property, we carry out a free, no-obligation site survey for every enquiry and follow it with one fixed, itemised quote covering materials, labour, and structural work.
As a London-based extension contractor, we work across a wide range of property types — Victorian terraces, semi-detached houses, and new-build flats — each of which brings its own foundation, boundary, and party wall considerations that a fair quote needs to account for.
Most home extensions London projects we complete run from around six weeks for a single-storey extension up to twelve weeks or more for a full double-storey build with structural alterations. Timelines depend on the scope agreed at quote stage, planning and building control approvals, and access to the property. We confirm a realistic schedule with you before work begins, not after.
When comparing companies offering home extensions London, it's worth checking whether structural calculations and building control sign-off are included, whether the quote is fixed or subject to change, and whether workmanship is covered by a guarantee after handover. Grand Home Construction LTD carries out every job with our own in-house trades, provides one fixed quote before work starts, and backs every home extensions London job with a 10-year workmanship guarantee.
We carry out home extensions London and the surrounding boroughs, from Victorian terraces to semi-detached houses. If you're planning a kitchen renovation or full property renovation alongside your extension, our team can scope both together so the trades and timeline line up from the start.
It depends on the size and type of extension, the existing structure, and whether planning permission is needed. We provide a free site survey and one fixed, itemised quote for every home extensions London job rather than a generic starting price, since costs vary significantly between a single-storey and a double-storey build.
Many extensions fall under permitted development, though this depends on the size, position, and any previous extensions to the property. Our team can advise on your specific situation as part of the initial consultation.
If your property is attached or semi-detached, a party wall agreement is often required for structural work near a shared boundary. We can guide you through this process as part of the project.
Most home extension work can be done while you remain in the property, though there will be periods of noise, dust, and restricted access to parts of the house. We'll agree a realistic timeline with you at quote stage so you know what to expect.
Every home extension job is covered by a 10-year workmanship guarantee. If something needs attention after handover, we come back and fix it.
Grand Home Construction built our rear extension on time and it blends in perfectly with the original house. The structural work, building control, and finishing were all handled by one team. Highly recommend.Grand HomesProperty Developer
Get a free, no-obligation quote and site visit — most projects start within 4 weeks.