A well-built extension is the cheapest square footage you will ever buy. We handle the whole job — footings, drainage, brickwork, roof, first fix, plastering and finishing — so you are never left chasing separate trades or waiting weeks between stages.

Extensions carried out by Trio Construction Group

What we cover

  • Single-storey rear and side extensions
  • Double-storey extensions
  • Wrap-around and infill extensions
  • Kitchen and dining extensions
  • Structural steels and knock-throughs
  • Building Control liaison from start to sign-off

Part of our extensions & conversions work

  • House extensions
  • Garage conversions
  • Structural openings & steels
  • Knock-throughs & remodelling

What is included

We start with the groundwork — setting out, excavation, footings and drainage — then build up through blockwork and brickwork, structural steels, roof and weathering. Once you are watertight we move onto first fix, plastering, second fix and decoration. Because the same team carries the job the whole way through, the standards set on day one are the standards you get on handover.

Working around your house

Most of our extension work is on occupied family homes. That means dust sheets and protection where it matters, the site swept at the end of the day, materials stacked tidily rather than dumped across the drive, and a clear heads-up before anything noisy or disruptive happens.

Planning and Building Regulations

Plenty of extensions fall under permitted development, but not all of them. We will tell you honestly which category yours is likely to be in, work to your architect and structural engineer's drawings, and deal with Building Control inspections at each stage so the job signs off cleanly.

Extensions questions

How long does a single-storey extension take?
Most single-storey rear extensions run somewhere between eight and fourteen weeks on site, depending on size, ground conditions and how much internal remodelling goes with it. We give you a realistic programme with your quote rather than an optimistic one.
Do I need drawings before you can quote?
For an accurate fixed price, yes — we price from drawings and a structural spec. If you have not got that far, we are happy to come out, talk through what is possible and give you a ballpark so you know whether it is worth taking to design stage.
Can you work to my architect's plans?
Yes, and most of our extension work is exactly that. Send the drawings over and we will price them as specified.

Free no-obligation quotation

Tell us about the job

Call us today to get in touch for a free, no-obligation quotation. No job is too big or too small — from a couple of days of repointing to a full double-storey extension.

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Thinking about extensions?

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