What trades do I need to build an extension?

If you’ve decided that if you build an extension to your new home olves many problems – you have outside space to spare, yet feel cramped inside, the Stamp Duty holiday is over and moving out of the area is out of the question – then yes, building an extension is probably your solution. But where do you start? Our guide on ‘What trades do I need to build an extension?’ outlines the steps required and which trades you will need to call upon.

But it also gives you an alternative solution should you decide that the time, inconvenience of project management, and potential stress of overseeing the whole job is better left to the professionals.


tradesman builder


Step One – Design and Planning

Before you can even consider the building work itself, and ask yourself what trades do I need to build an extension, do you have an idea in mind? What are your objectives for building an extension? Are you sure the extension will add value as well as space to your home? Are you aware of building regulations and planning permission?

This is where an architect or designer will be worth their weight in gold. Not only will they be able to put some meat on the bones, as it were, of your vision, but they will be able to suggest solutions if you can’t see a way to create the extra space you need from the existing space you have.

Planning Permission and Building Controls

They will also be able to advise which stages will need what by way of planning permission and Building Controls and potentially answer what trades do I need to build an extension if you decide to plan the work yourself.

Step one complete – well once any planning permissions are granted! Time to get your quotes lined up.


Design and planning extension


Step Two – choose your build team

We always advise to obtain three quotes before choosing your team, which is where pulling together separate tradespeople for each relevant stage can become onerous, confusing, and potentially extremely stressful.

Don’t be afraid of asking for references from all tradespeople, evidence of insurance, and be clear on your exact requirements as well as payment terms. Any reputable business will gladly provide all this information as standard and will take time to discuss any queries you may have.

If it is getting a little daunting, read on, and you can at least make an informed decision once you have seen the breakdown.

With your architect plans agreed and planning permission granted, the following lists the trades and jobs which you are likely to need completing and will answer ‘what trades do I need to build an extension.’


Builder – Groundworks, drainage, and damp proof. Bricks or blockwork and insulation. Roofing, battens, and trusses. Flashing, fascias, soffits, downpipes, and guttering. The list goes on! And you could employ each sub-contractor individually, a groundworker, a damp proof company, a brick layer, a roofing company… the list goes on… but…

Finding the right builder means they can take care of all of this for you, from ordering and arranging delivery, to the actual build. But make sure you have agreed who is responsible for each element within the build phases if you want to get involved. Never just assume either party has it covered! Your dream extension could come crashing down around you if key details are missed.

Copperwheat Conversions never miss a thing, but that’s because we love to manage entire build projects from start to finish, which you can read more about later.

For now, though, let’s continue to work our way down the list.


Glazier – Dormer windows, roof lights, standard windows, doors. Do you know what you want and how you want your extension to look and feel? It’s not as easy as you might think if you’re planning all of this yourself.

Your architect or designer will have helped bring it to life to a certain degree. But there are still some details that are worth mentioning.

For instance, if you are wanting roof lantern blinds with smart controls, you will save yourself much twitchiness by introducing the blind suppliers to the glazier and also your electrician at this stage. It’s these finer points that will help the final stages run much more smoothly – we think of them all! And that leads me nicely onto the other trades.


Electrician – once the external walls are in place, it’s time for first fix of your electrics, plumber for water, boiler gas engineer and carpenter. So, your plumber and joiner are also next in line before any of the internal walls can be finished.

Once your stud walls are up, supports are in place, and first fixes complete, the original walls can come down. And it’s time for the extension to really start taking shape.

Enter your plasterer to complete the boarding and plastering (and any external walls, however you have chosen your exterior walls to be finished) before the plumbing and electrics can go through second fix stage. This is when their work is completed and can be signed off as safe and compliant.


Plans to build an extension



The Services

By now, you will have your services – gas, electricity, lighting, and heating – all in place, and your internal fixtures, fittings, and flooring can be laid.

So, this could mean flooring specialists, carpet fitters, tilers, blind and curtain companies, kitchen fitters, and possibly other trades too are added into the equation now.

All before you call in the decorators and possibly garden landscapers too? At which point, not only are you asking what trades do I need to build an extension? But also wondering why you have decided to take it on yourself!

Bringing in The Experts

So, rather than ask ‘what trades do I need to build an extension?’… instead ask ‘How Copperwheat Conversions can do it all for you?’

So, rather than worrying over who you need to call upon and when. How you’re going to manage so many schedules, deliveries, and payments. Why not let the team here at Copperwheat Conversions take care of it all for you?

Project Management

Each job we take on is as important as the rest. Completed with the same level of pride and professionalism. But there’s one thing we relish, and that is the opportunity to project manage an entire new build, home renovation, conversion or extension.

From receiving your design plans, one call to us and we literally run with the rest of the project for you. Leaving you to spend more precious time with your loved ones and doing the things that are important to you.

Expert Local Business Partners

With over 70 years in the building trade between father and sons, we have built not only a highly recommended reputation in our own business. But we also know, and only use, the most reliable and expert local business partners to bring onto our project team. Technical or specialist tradespeople who we can always rely on to complete their specific jobs to the exact same standards you would expect from the best in the business.

You don’t have to worry about timescales, schedules for delivery, managing a delay due of the weather, piles of separate invoices, and dozens of groups working on your extension.

In fact, the question as to what trades do I need to build an extension needn’t cross your mind at all!

Call Copperwheat Conversions to build an extension for you for the most efficient service from the initial site visit to the final sign-off.