Extensions and Conversions in London

Alfa Quality Construction provides extensions and conversions in London for homes and commercial properties. We build house extensions and commercial extensions, and convert existing spaces to suit their intended use.
Projects can include rear and side extensions, loft conversions, garage conversions and basement conversions. We review the building, access, proposed layout and any structural or approval requirements before agreeing the work. Before starting, check whether your project needs planning permission.
Call 07443 699 512 to discuss your extension or conversion and request a free quote. Share your postcode, photographs and any existing drawings.

Property Extensions
Our extension builders work on house extensions and commercial projects, including rear and side additions where suitable for the property. We review foundations, structure, drainage and connections to the existing building, with the materials and construction scope agreed around the design requirements and intended use.
Property Conversions
We convert lofts, garages, basements and other underused areas into spaces suited to their intended use. Layout, ceiling height, stair access, ventilation and any structural work are reviewed for the property. The conversion scope is agreed around the building’s condition, design requirements and proposed finish.


Planning and Costs
Extension and conversion costs depend on the property, access, structural work and level of finish. We discuss the proposed scope, materials, programme and any design or approval steps required. Your quote explains the agreed work, with any changes discussed before additional work proceeds.
Our Extension and Conversion Process
✓ First Call: Share your postcode, photographs and the type of extension or conversion you are considering.
✓ Site Review: We review the property, access and proposed work, including any structural, design or approval requirements.
✓ Quote and Plan: We agree the scope, materials, pricing and proposed programme, with any required design and approvals addressed before construction.
✓ Building Work: We complete the agreed extension or conversion, review the finished work with you and discuss any remaining items.
