Trusted, tidy and on time — we build it right, first time.

Allens Construction is a family-run building company based in Dorchester, Dorset. We specialise in extensions, refurbishments, garage and outbuilding construction, surfacing and repair work for homeowners and small businesses across Dorset and the South West. With straightforward pricing, clear communication and a focus on neat, durable finishes, we take the stress out of building projects — from small repair jobs to full-scale refurbishments.

As proud partners of LABC (Local Authority Building Control), we ensure all our work meets the highest standards of safety, compliance and quality. This gives our customers the added reassurance that projects are carried out correctly from start to finish.

What we do

House extensions, single-storey and two-storey works

Refurbishments, wetrooms and public toilet repairs & upgrades

Garage and outbuilding construction (single and double)

Garden offices, timber clad, insulated with uPVC double glazing

Groundworks, drainage, landscaping and surfacing

Carpentry, joinery and general building maintenance

Design and technical services to help plan your project
(If you don’t see your job listed, call — we’re happy to advise.)



Why customers choose Allens Construction

Experienced local team — Owner-led on every job with years of on-site building and project management experience.

LABC partnered — Our partnership with Local Authority Building Control ensures every build is carried out to the latest regulations with professional oversight.

Vetted & insured — Fully insured with appropriate public liability cover and all necessary checks in place.

Transparent pricing — Clear written quotes, itemised where requested, and no hidden extras.

Quality, visible work — We upload before/after photos and customer testimonials so you can see the finish and attention to detail.

Reliable communication — Direct contact by phone or email, and a named site lead for every job.

Our customer promise

We turn up when we say we will, keep the site tidy, protect your home during works and leave the project ready to enjoy. We’ll talk you through choices and offer pragmatic solutions that balance cost and longevity.
Being LABC partnered also means our customers get the added benefit of compliance-backed reassurance, giving peace of mind throughout the project.

Recent work (examples)

Single-storey rear extension — full build, insulated floor and warm flat roof (Weymouth).

Single-storey extension used as an additional bedroom (Dorchester).

Garden office — timber clad, fully insulated with uPVC double glazing.

Public toilet refurbishment and security upgrades for Wincanton Town Council.

Resurfaced commercial car park, full site setup and traffic management.

Community building construct and fit out with 5 commercial kitchen stations, 3 toilets 1 to be disabled accessible and a general-purpose room. This build also included solar installation along with ASHP install, and a rainwater holding pond discharging through an attenuation system into the river. For Weymouth Town Council


What our customers say

“Clean, professional and finished ahead of schedule. Shaun and the team were easy to deal with and kept the site tidy.” — Mr R. Silk, Dorchester

“Allens Construction built our single-storey extension. The finish was excellent and they handled everything smoothly. Would highly recommend.” — Mr R. Carpinter, Weymouth

“Our new garage was completed on time and to a very high standard. Friendly, reliable and the partnership with LABC gave us extra confidence.” — Mr I. Jordan, Dorchester

“Shaun and his team landscaped our garden beautifully. Tidy, professional and the attention to detail really showed.” — Mrs S. Freeth, Bridport

“The bathroom refurbishment was managed perfectly. Everything was neat, safe and up to regulations thanks to their LABC partnership.” — Mrs H. Baldwin, Ringwood

Practical details

Company: Allens Construction

Based: Dorchester, Dorset.

Ready to talk?

Drop us a message via Checkatrade