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House extensions in Barry & the Vale of Glamorgan

More space

Space added to the house you already have

More room without moving. The visit checks the plot before anyone promises a price or a start date.

Home extensions across Barry are planned from Rhoose. Extension builders serving Barry start with the plot, the existing house and which rooms you still need to use. A single storey, two storeys and a side extension are different builds.

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01

Stay in the area you know

You gain rooms without having to sell and start again. The new space is planned around the house you live in.

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02

The plot decides the shape

The plot is checked before a price. A tight side gap is a different job from a garden with room behind house.

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03

The shell before the finish

The shell, the foundations and the way rainwater leaves the roof are agreed before anyone talks about the kitchen inside.

Types of house extension

Three ways to add the space

A rear house extension is usually a single storey, so it is planned with that work rather than treated as a separate type.

Single-storey extensions

One storey, often to the rear or side. It is the usual way to add a kitchen, a living room or a utility space on the ground.

Double-storey extensions

Rooms on two floors. The existing roof and foundations have to be assessed before anyone assumes they can carry the new work.

Rear Extension

Extend behind the home to open up the ground floor, enlarge the kitchen, or create a more social living area.

Side extensions

The space beside the house. The boundary, access for the build, and any neighbour notice are part of the first visit.

Not Sure Where to Extend?

Use the property visit to compare the available space, the room you need and how each option could connect.

Before Groundworks

The plot, the shell and the ground

Extension foundations and drainage are designed for this plot after the ground is seen. They are not copied from the house next door.

What Shapes the Investment

A house extension cost follows the size, the ground, the number of storeys and the specification inside. It is written after the plot has been seen.

How the Build Sequence Works

How long a house extension takes depends on planning, the build sequence and the weather on the shell. Dates are set after that is known.

Confirm the Planning Route

Building regulations for an extension cover the structure, insulation, drainage and fire safety. Check planning permission for extensions separately before you assume a drawing is enough.

Extension Work in View

See How Larger Projects Take Shape

Completed residential projects show how substantial home improvements are coordinated across each stage, with care for the property and the people living there.

Project Leadership

A Consistent Lead from First Visit

Lance remains responsible for coordinating the agreed extension stages from the initial property visit through to sign-off.

Written quotations and agreed check-ins help you follow the build, while a respectful approach keeps the site safe and orderly.

50+

Five Star Reviews

12+

Years Experience

150+

Projects Completed

home extension groundworks drainage foundations barry vale of glamorgan cooksey renovation
rear home extension finished living space barry vale of glamorgan cooksey renovation

Extension Answers

Before you commit to an extension

These answers cover the key choices that shape the extension type, layout, planning route and impact on your home.

Maybe. In Wales the test is not the same as in England, and it depends on the house, the plot and earlier additions. A single-storey extension is the usual case, and the rules still have to be checked for that particular house.

Often yes. Planning permission and building regulations are separate. The structure, insulation and drainage can still need approval when planning does not.

Usually. The plan has to say which rooms stay open and how the build is reached. That is agreed before the quote is treated as final.

From Google

In their own words, with no count added

See what homeowners have shared about their experience with Cooksey Renovation.

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kimberly long profile picture
Kimberly Long
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Huge thank you to Lance and the team for their great work on our full bathroom renovation! Our old house threw up so many extra problems to work around, but the guys kept us well informed and worked hard to overcome everything They truly brought my vision of a modern meets vintage bathroom to life I'm especially obsessed with the tiling work, the detail and the effort for all those extra little touches make the room look so fab I am absolutely over the moon with how it's turned out! Thank you thank you thank you!
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liz parkinson profile picture
Liz Parkinson
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From initial consultation to finished job the Cooksey were brilliant. Always looking on time, worked a full day, cleaned up after themselves and made sure we were completely happy with the work. Very friendly and professional. Covered every aspect of the installation of a new bathroom from liasing with suppliers to the electrics , plastering and tiling. Highly recommended
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lynsey webb profile picture
Lynsey Webb
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We cannot recommend Lance and the team enough. From beginning to end him and the team were professional, knowledgeable and communicative. Lance did multiple visits to us before starting work to ensure the best end result, our bathroom was a difficult refurbishment to say the least, but the final result is a testament to Lance and the teams skill and determination. When the work was being completed they were clean and tidy, often worked incredibly long days and kept me informed on any changes or challenges. He worked with us to keep to our budget updated us on any additional material charges. My neighbour even commented on how friendly and polite they all were. I have already recommended Lance to multiple people but will also have them back for any other renovation we need completing in the future. I wouldn't go with anyone else now.
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geoff llewellyn profile picture
Geoff Llewellyn
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Recently had our Bathroom renovated by Cooksey Renovation; they did a fantastic job throughout and transformed our bathroom! The quality of their work is to a very high standard. They arrived on the agreed date to commence the renovation, were on time every morning, cleaned up after them every evening, and were pleasant and communicative throughout. I can’t recommend this company highly enough and would certainly use them again or recommend them to friends and family.
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stephanie king profile picture
Stephanie King
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Cooksey renovations and the team did an amazing job with our new kitchen and flooring. The job needed blocking up doors, windows and a fair bit of plastering. They were all really tidy and cleaned up after each day before they left. I'm so happy with the work they have done. Thank you!
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rachel cleave profile picture
Rachel Cleave
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I cannot recommend Lance and his team enough! They have renovated both my bathroom and en-suite as well as repairing and replastering my living room ceiling following existing water damage. When I moved into my house, I knew there was gonna be a lot of work to do following previous leaks in the en suite and previous bad workmanship. All the team were professional, trustworthy and skilled in how they transformed my house. They kept everything clean and tidy (I even caught them hoovering my doorstep at one stage!) and made the house useable in between their working days. I had a very specific vision and they were able to make my dreams come to life and I’m so pleased with the end result. They ripped out my old suites, replaced rotten floor boards, rebuilt damaged walls and install all new paperwork. Nothing was too much trouble and they were also the most competitive quote I received. I have a kitchen and artexed ceilings to be renovated in the new year and there is no one else I would consider using. Thanks guys! I really love what you’ve done!
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vivienne stark profile picture
Vivienne Stark
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Cooksey Renovation are brilliant! Lance and his team are friendly, professional very skilled in all aspects of home renovation. Over the past 8 months they have done a lot of work in our new house and turned it into the home we wanted. Bathrooms, kitchen and living room have been completely renovated and modernised. We would highly recommend Lance for any work you need.
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ann walker profile picture
Ann Walker
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Cooksey Renovations updated our tired bedrooms. Removed an old built in office, and two sets of large fitted wardrobes, removed one wall and door to enlarge main bedroom, made good all coving, fitted new radiators and flooring and much more. Excellent job, highly recommend. Would definetly use again. Many more photos on their Facebook page.
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sophia frangoulis profile picture
Sophia Frangoulis
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High quality workmanship. Couldn't do enough for us - the best around.
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dylan herbert profile picture
Dylan Herbert
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A return visit by Cooksey renovations to tile the floor of 3 existing bathrooms that didn’t need a complete re fitting. The work was to the highest and we are delighted with the end result. We have no reservations in recommending Cooksey renovations for this type of work.
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Extension Coverage

No published extension in a named town yet

Homes across the Vale are visited from Rhoose. The list of towns is on Areas we serve. None of them has a published extension yet.

Home Extensions in Barry

Choose a home extension builder in Barry to add a kitchen-diner, extra bedroom, or more flexible family space.

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Home Extensions in Penarth

Stay in the home you enjoy while gaining extra room through a rear, side, or two-storey addition.

penarth e1778675939613

Home Extensions in Dinas Powys

Create space for changing family needs with an extension connected thoughtfully to the existing property.

dinas powys

Home Extensions in Rhoose

Add useful floor space through a locally managed build shaped around your home and the room you need.

rhoose

Home Extensions in Llantwit Major

Open up the ground floor or add another room with the proposed build organised around the available footprint.

llantwit major

Home Extensions in Cowbridge

Gain a larger kitchen, family area or additional bedroom through an extension suited to the property.

cowbridge

Home Extensions in St Athan

Make room for work, family life or overnight guests without giving up your current home and location.

st athan

Home Extensions in Sully

Use suitable land behind or beside the property to create an addition with a practical connection indoors.

sully

Home Extensions in Wenvoe

Build a kitchen-diner or flexible living area that gives everyday routines more space to work comfortably.

wenvoe

Home Extensions in Cardiff

Increase your living space without moving by adding a room designed around the existing house and household.

cardiff

Home Extensions in Bridgend

Create additional space for cooking, dining, working, or sleeping through a carefully scoped extension project.

bridgend

See the plot before the build is priced

The quote follows the plot, not a photograph of the garden.

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