07834 989360 Mon–Fri, 8am–5pm - AboutServicesAreasOur WorkReviewsContact07834 989360Request an Estimate Home/ - Areas we coverAreas we cover # Local builders working acrossSouth East London,Kent and the borders Our office is at Onega House, 112 Main Road, Sidcup, Kent, DA14 6NE. From there we cover Bexley, Kent, South East London and the surrounding areas, close enough to survey quickly and be on site when it matters. Request an estimate07834 989360 30 yearsof construction experience across the team CABE membersprincipals are members of the Chartered Association of Building Engineers 5.0 starsrated 5.0 from 14 Google reviews One point of contactdesign coordination, planning, procurement, build and supervision under one contract Choose your area ## Where we work ## Bexley We work across Bexley from our base a few minutes away in Sidcup: extensions, loft conversions, refurbishments and structural alterations, designed and built by one team with 30 years of experience. View area ## Kent From our Sidcup office we deliver extensions, loft conversions, refurbishments and new build homes across Kent: with design coordination, planning, procurement, construction and supervision all managed under one contract. View area ## South East London We work throughout South East London on loft conversions, rear and side extensions, structural openings and whole-house refurbishments, one contract from first drawing to final finish. View area ## Welling Welling homeowners come to us for extra ground-floor space and loft rooms: designed, coordinated and built without finding separate consultants yourself. View area ## Sidcup Sidcup is home. Our office is on Main Road, and a good share of our work is within a few miles of it: extensions, lofts, refurbishments and structural alterations. View area ## Bexleyheath Bexleyheath properties often have the side return and rear garden depth that make a wraparound extension transform the ground floor: and we coordinate the design and build it under one contract. View area ## Dartford Adding a bedroom above a new ground-floor room is often the most cost-effective way to grow a Dartford family home. We handle the structural design, the planning route and the build. View area ## Crayford We deliver extensions, loft conversions, structural openings and full refurbishments across Crayford, all under one contract with one point of contact. View area ## Blackfen Blackfen is on our doorstep. We take on extensions, loft conversions, internal alterations and refurbishments throughout the area: designed and built by one team. View area ## Find us Onega House, 112 Main Road, Sidcup, Kent, DA14 6NE ## Not sure if you're in our area? Send us your postcode and we'll tell you straight away. Request an estimate07834 989360 Extension, loft conversion and refurbishment specialists based in Sidcup, working across London, Kent and the surrounding areas. 5.0 from 14 Google reviews Facebook - Instagram ## Services Home extensions - Loft conversions - New build homes - Refurbishments & renovations - Internal alterations - Outbuildings - Drawings & design - Structural works ## Areas we cover - Bexley - Kent - South East London - Welling - Sidcup - Bexleyheath - Dartford - Crayford - Blackfen ## Get in touch - 07834 989360 - info@ashcroftconstructiongroupltd.co.uk - Onega House, 112 Main Road, Sidcup, Kent, DA14 6NEMonday8am – 5pm Tuesday8am – 5pm Wednesday8am – 5pm Thursday8am – 5pm Friday8am – 5pm SaturdayClosed SundayClosed © 2026 Ashcroft Construction Group Ltd. All rights reserved. ReviewsCookie policyPrivacy policyTerms & conditionsPrincipals are members of the Chartered Association of Building Engineers (CABE). Call nowGet estimate We use essential cookies to run this site, plus cookies from our enquiry form, chat and review widgets. Cookie policy RejectAccept