
Bexley · Rated 4.7 on Google
Home extensionsand loft conversionsin 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.
Written, itemised estimate after a survey, no obligation to proceed.
30 yearsof construction experience across the team
CABE membersprincipals are members of the Chartered Association of Building Engineers
4.7 starsrated 4.7 from 14 Google reviews
One point of contactdesign, planning, procurement, build and supervision managed in-house
Building in Bexley
We work in Bexley, and we know its houses
Bexley is core territory for us. Our office is at Onega House, 112 Main Road, Sidcup, DA14 6NE, a short drive from Bexley village, Old Bexley and the surrounding roads, so surveys, site visits and follow-up calls during the build are straightforward to arrange rather than something that has to be scheduled weeks out. We work Monday to Friday, 8am to 5pm.
Being close to the work matters more than it sounds. It means a survey can be booked quickly at the start, that the design conversation can happen face to face over the drawings, and that during construction the people responsible for your project are not managing it from the other side of London. It also means our brickwork, carpentry and roofing trades already know the local housing stock.
The housing here spans inter-war semis and detached houses, post-war estates, pockets of older cottages around Old Bexley and newer infill development. Each has its own quirks: solid or early cavity walls, original roof structures of varying quality, sub-floor ventilation that has often been blocked over the years, and extensions added in the 1970s and 80s that were built to a very different standard from today's regulations.
The requests we get most often in Bexley are a rear or side extension to open up a cramped kitchen, a loft conversion for a fourth bedroom, a knock-through to join two small reception rooms, and full refurbishment of a house that has just changed hands. Wraparound extensions come up regularly where a side return and a decent rear garden exist together.
Bexley's mix of 1930s semis, post-war housing and older cottages means no two extensions are detailed the same way. We survey each property before designing, then match brickwork and roof lines so new work reads as part of the original house.
Every Bexley project runs through the same five stages: design, planning and preparation, procurement, construction and project supervision, all managed in-house by a team with 30 years of experience, with principals who are members of the Chartered Association of Building Engineers. You can request an estimate or read more about how we work.
Get an estimate in Bexley
Send us the details and we'll be in touch during working hours, Mon–Fri, 8am–5pm.
Services in Bexley
What we build in Bexley

Home Extensions
Single-storey, double-storey and wraparound extensions designed, drawn and built by one team.
Home extensions in Bexley
Loft Conversions
Turn unused roof space into a bedroom, en-suite or office, structurally sound and building-control signed off.
Loft conversions in Bexley
New Build Homes
Individual new build homes delivered from design package through to completion.
New build homes in Bexley
Full Refurbishments & Renovations
Whole-house refurbishment, kitchens, bathrooms and period property renovation, managed end to end.
Refurbishments & renovations in Bexley
Internal Alterations
Knock-throughs, new openings, reconfigured layouts and structural steels installed safely.
Internal alterations in Bexley
Outbuildings & Garden Rooms
Insulated garden rooms, home offices, gyms and garages built to last all year.
Outbuildings in Bexley
Architectural Drawings & Design Packages
Survey, concept, planning and construction drawings produced in-house, ready to build from.
Drawings & design in Bexley
Structural Works
Steels, foundations, load-bearing alterations and structural repairs.
Structural works in Bexley
Carpentry & Joinery
First and second fix carpentry, roof structures, staircases and fitted joinery.
Carpentry in Bexley
Brickwork
Extensions, garden walls, repointing and matched brickwork on period properties.
Brickwork in Bexley
Roofing
Pitched and flat roofing, dormers, leadwork and roof coverings on new and existing homes.
Roofing in Bexley
Electrical, Plumbing & Gas
Coordinated through vetted, accredited subcontractors: NICEIC/NAPIT registered electricians and Gas Safe engineers.
Electrical & plumbing in BexleyWhy Ashcroft
Why homeowners in Bexley choose us
Based minutes away in Sidcup
Our office is on Main Road in Sidcup, so Bexley surveys and site visits are local work for us rather than a trip across the city.
30 years of experience across the team
We are run by construction professionals with 30 years of experience across the team, delivering turn-key residential projects.
CABE-member principals
Our principals are members of the Chartered Association of Building Engineers and follow its codes of practice and ethical standards.
Rated 4.7 on Google
A 4.7-star rating from 14 Google reviews, built on clear communication, attention to detail and projects delivered to a high standard.
One team, five stages
Design, planning and preparation, procurement, construction and project supervision are all managed in-house, so there is no separate architect or engineer to appoint.
Accredited specialist trades
Electrical work is carried out by NICEIC or NAPIT registered subcontractors and gas work by Gas Safe registered engineers, coordinated into our programme.
Local property issues
What we typically find on Bexley properties
1930s cavity walls and wall ties
Early cavity construction around Bexley often has ties that have corroded, which shows as horizontal cracking and bulging on exposed elevations. It is a repair, not a rebuild, if it is caught before the masonry moves.
Roof spread on original cut roofs
Inter-war roofs were built with lighter timbers than current standards, and removing or notching them for a loft conversion without designed support is how ridges sag and walls push out.
Extensions added decades ago
Many houses here already carry a 1970s or 80s rear addition with shallow foundations, a flat roof laid without falls and little insulation. Tying new work into it needs the existing structure checked first.
Drainage and ground under new footings
Older drain runs frequently cross the exact spot where an extension wants a foundation, and mature trees in long back gardens affect foundation depth. Both are found at survey, not after breaking ground.
None of this is unusual, and none of it is a reason not to build. It is the reason we survey before we design and design before we price, so what turns up in Bexley is in the estimate rather than in a mid-build conversation about extra cost.
How it works
Five stages, all managed in-house
- 01
Design
We take your brief, survey the property and produce the drawings and design package in-house, no separate architect to appoint.
- 02
Planning & preparation
Applications, building control and the programme of works are prepared and coordinated before anyone lifts a tool.
- 03
Procurement
Materials and vetted trades are secured against a fixed scope, so the build starts with everything in place.
- 04
Construction
Your build is delivered by skilled tradesmen working to the agreed drawings, programme and standard.
- 05
Project supervision
A named point of contact supervises the site, handles building control and keeps you updated to completion.
Bexley questions
Frequently asked questions
Do you cover Bexley?
Yes. Bexley is one of our main areas, worked from our office at Onega House, 112 Main Road, Sidcup, DA14 6NE.
How quickly can you visit a property in Bexley?
We arrange surveys during working hours, Monday to Friday, 8am to 5pm. Because we are based in Sidcup, Bexley visits are local and easy for us to schedule, call us and we will agree a time.
What does an extension cost in Bexley?
Cost is set by footprint, ground conditions, how much structure is being removed, glazing and the internal specification, not by postcode. After a survey we issue a written estimate with the scope itemised.
Do you handle planning applications for Bexley properties?
Yes. We produce the drawings in-house, prepare and coordinate the planning application, and deal with building control from application to final certificate.
Will a new extension match my existing brickwork?
That is the aim, and it is set out before laying starts. We sample and match brick and mortar colour, and set coursing to line through with the existing openings wherever the structure allows.
Do you offer emergency call-outs in Bexley?
No: we are a design-and-build contractor rather than an emergency repair service. Our work is planned projects: extensions, loft conversions, refurbishments, structural alterations and new builds.
Can we stay in the house during the work?
Usually yes for a single-storey extension or loft conversion. We tell you at estimate stage which phases realistically need you out and for how long.
Which other areas near Bexley do you work in?
Sidcup, Welling, Blackfen, Bexleyheath, Crayford, Dartford and the wider Kent and South East London area.
Rated 4.7 from 14 reviews
What our clients say
“Adam, Robbie and the team were fantastic delivering our kitchen extension and bathroom, great communication throughout and happy to adjust the design as we went.”
“Adam and Rob's team did an amazing job on our extension, from start to finish they made the process straightforward and painless.”
“Professional, friendly and did a wonderful job creating a new opening between rooms in our Victorian home. Adam communicated clearly throughout. Highly recommend.”
Coverage
Areas near Bexley we also serve
Alongside Bexley we work across Sidcup, Welling, Blackfen, Bexleyheath and the wider Kent and South East London area from our office at Onega House, 112 Main Road, Sidcup, Kent, DA14 6NE. If you are not sure whether your postcode is covered, contact our Sidcup builders and we will tell you straight away. You can also see examples of our work or start from our home page.

Planning work in Bexley?
Tell us about the property and what you want to achieve, or call 07834 989360.
