
Welling · Rated 4.7 on Google
Extensions and loftconversionsin Welling
Welling homeowners come to us for extra ground-floor space and loft rooms: designed, drawn and built without appointing separate consultants.
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 Welling
We work in Welling, and we know its houses
Welling is a few minutes from our office at Onega House, 112 Main Road, Sidcup, DA14 6NE, and a steady share of our work sits in the roads between the two. Surveys and site visits are arranged Monday to Friday, 8am to 5pm, and being this close means the same people who design your project are the ones on site during it.
The housing here is dominated by inter-war semi-detached and terraced houses built through the 1920s and 30s, with pockets of post-war housing and later infill. That stock has recognisable characteristics: a narrow side passage, a decent rear garden, small separate reception rooms, a kitchen tucked at the back, and a roof with a hipped end and reasonable but not generous head height.
Those characteristics point to particular solutions. A side return filled in and combined with a modest rear extension usually transforms the ground floor for less than a full wraparound. Hip-to-gable and rear dormer loft conversions work well on this shape of roof. Knock-throughs between the two reception rooms open up the middle of the house that currently gets the least use.
We show the layout options at design stage, where the kitchen sits, where the glazing goes, how the circulation works, so you can compare them before committing money to a single scheme. That conversation is far cheaper on paper than it is once brickwork has started.
Much of Welling's housing stock is inter-war semi-detached, which suits side-return and wraparound extensions particularly well. We show you the layout options at design stage so you can see the difference before committing.
Every Welling 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 Welling
Send us the details and we'll be in touch during working hours, Mon–Fri, 8am–5pm.
Services in Welling
What we build in Welling

Home Extensions
Single-storey, double-storey and wraparound extensions designed, drawn and built by one team.
Home extensions in Welling
Loft Conversions
Turn unused roof space into a bedroom, en-suite or office, structurally sound and building-control signed off.
Loft conversions in Welling
New Build Homes
Individual new build homes delivered from design package through to completion.
New build homes in Welling
Full Refurbishments & Renovations
Whole-house refurbishment, kitchens, bathrooms and period property renovation, managed end to end.
Refurbishments & renovations in Welling
Internal Alterations
Knock-throughs, new openings, reconfigured layouts and structural steels installed safely.
Internal alterations in Welling
Outbuildings & Garden Rooms
Insulated garden rooms, home offices, gyms and garages built to last all year.
Outbuildings in Welling
Architectural Drawings & Design Packages
Survey, concept, planning and construction drawings produced in-house, ready to build from.
Drawings & design in Welling
Structural Works
Steels, foundations, load-bearing alterations and structural repairs.
Structural works in Welling
Carpentry & Joinery
First and second fix carpentry, roof structures, staircases and fitted joinery.
Carpentry in Welling
Brickwork
Extensions, garden walls, repointing and matched brickwork on period properties.
Brickwork in Welling
Roofing
Pitched and flat roofing, dormers, leadwork and roof coverings on new and existing homes.
Roofing in Welling
Electrical, Plumbing & Gas
Coordinated through vetted, accredited subcontractors: NICEIC/NAPIT registered electricians and Gas Safe engineers.
Electrical & plumbing in WellingWhy Ashcroft
Why homeowners in Welling choose us
Minutes from Welling
Our Sidcup office is a short drive away, so surveys, design meetings and site attendance are easy to arrange.
Drawings and build in one contract
Architectural drawings and design packages are produced in-house, so there is no separate architect or engineer to appoint.
30 years of experience
30 years of construction experience across the team, applied to the inter-war housing that makes up most of Welling.
CABE-member principals
Structural and building regulations work is handled by principals who are members of the Chartered Association of Building Engineers.
Rated 4.7 on Google
4.7 stars from 14 reviews, with clients pointing to communication and finish quality.
Accredited electrics and gas
NICEIC or NAPIT registered electricians and Gas Safe registered engineers do and certify that work.
Local property issues
What we typically find on Welling properties
Narrow side returns and boundary lines
Filling in a side passage often means building to or near the boundary, which brings party wall procedures, eaves and gutter overhang and rainwater disposal into the design from day one.
Hipped roofs and head height
The hipped roofs typical here reduce usable loft floor area. Hip-to-gable work solves it, but only after head height and roof structure have been measured properly.
1930s wall ties and pointing
Corroded ties and eroded mortar joints on exposed elevations let water into the wall. Repointing and retrofit ties are maintenance items; ignored, they become masonry repair.
Original service installations
Houses of this age frequently still carry undersized consumer units and old pipework. Extending circuits onto an inadequate board moves the weak point rather than removing it.
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 Welling 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.
Welling questions
Frequently asked questions
Do you cover Welling?
Yes. Welling is one of our closest areas, worked from our office at Onega House, 112 Main Road, Sidcup, DA14 6NE.
How quickly can you get to Welling?
It is a short drive from our Sidcup office, and surveys are arranged during working hours, Monday to Friday, 8am to 5pm.
What does an extension cost in Welling?
The cost drivers are footprint, ground conditions, structural work, glazing and internal specification rather than location. We survey and issue an itemised written estimate.
Is a wraparound extension worth it on a Welling semi?
Often yes, because the side return and rear garden depth suit it, but sometimes a smaller rear extension plus a knock-through gives most of the benefit for less. We will tell you which before you spend on drawings.
Can my loft be converted?
Head height, roof structure and stair position decide it. We measure at survey and tell you honestly whether a conversion, a hip-to-gable with dormer, or a rear extension gives the better result.
Do you handle planning and building control?
Yes. We prepare and coordinate the planning application where one is needed and deal with building control from application to final certificate.
Do you do emergency repairs in Welling?
No, we deliver planned design-and-build projects rather than emergency call-outs.
Which nearby areas do you cover?
Bexleyheath, Blackfen, Sidcup, Bexley, Crayford and the wider South East London and Kent 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 Welling we also serve
Alongside Welling we work across Bexleyheath, Blackfen, Sidcup, Bexley 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 Welling?
Tell us about the property and what you want to achieve, or call 07834 989360.
