Home extensions
Rear, side-return, wrap-around and double-storey extensions designed around your property.
Explore services →Local construction services
Builders in Croydon, Purley & Coulsdon
SEM Group provides extensions, loft conversions, renovations, kitchens, bathrooms and complete design-and-build services across Croydon, Purley and Coulsdon.
Building in your area
Designed carefully. Managed clearly. Built properly.
SEM Group helps homeowners across Croydon, Purley and Coulsdon improve, extend and completely transform their properties. Our team can manage the journey from early design and technical drawings through approvals, structural work, construction and final finishing.
Whether you are planning additional family space, modernising an older property or reorganising the whole ground floor, we provide one accountable team and a clear route from first consultation to handover.
Arrange a consultation →Services available
Complete support for your project.
Choose an individual building service or ask SEM Group to coordinate the complete design-and-build journey.
Loft conversions
Dormer, rooflight and hip-to-gable conversions with structural and staircase coordination.
Explore services →Renovations
Complete refurbishments, structural alterations and interior transformations.
Explore services →Kitchens & bathrooms
Design, supply and professional fitting with all associated building services.
Explore services →New builds
Managed construction from pre-start planning through to completion and handover.
Explore services →Design & technical
Architectural drawings, planning, structural calculations, Party Wall support and Building Control.
Explore services →Locations covered by this team
Croydon · Purley · Coulsdon
Planning a project in one of these locations? Tell us about the property, the work you have in mind and your preferred timescale. We will help you understand the most practical next step.
Discuss your project →Have a project in mind?
Let’s build something
exceptional.
Tell us about your property and plans. We’ll arrange a complimentary, no-obligation consultation.
Start your project →Or email info@semgroup.uk