Groundworks & foundations
Preparation of your Trethomas site including excavation, drainage and solid foundations to support the new extension.
House Extensions Trethomas
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House Extensions in Trethomas
We design and build high-quality house extensions for homeowners across Trethomas and the surrounding villages, giving you more space without the need to move. Whether you are extending your kitchen, creating an open-plan living area, or adding room for a growing family, we manage the entire build from foundations to final finishes.
Our Trethomas extension projects cover groundworks, structural work, roofing, windows, electrics, plumbing, and interior finishing, all completed to current building regulations. With a focus on quality workmanship and local knowledge, we create extensions that blend seamlessly with your existing home while adding long-term value to properties throughout the Trethomas area.
House extensions are part of our complete home renovation services in Trethomas.
What we do
Structural build
Construction of the extension structure including walls, steel supports, roofing and insulation, built to last for years to come.
Windows & doors installation
Installation of windows, bifold or patio doors to maximise light and connect your Trethomas extension with your garden.
Interior finishing
Plastering, electrics, plumbing, flooring and final finishes to complete your new space ready for use.
Gallery
Frequently Asked Questions about House Extensions in Trethomas
Do I need planning permission for a house extension in Trethomas?
Many single-storey rear and side extensions in Trethomas fall under permitted development, but larger, two-storey or front extensions, and homes in conservation areas or listed buildings, usually need planning permission from Caerphilly County Borough Council. We assess your project and handle any applications for you.
Do house extensions in Trethomas need building regulations approval?
Yes. All structural work is completed to current building regulations and signed off through Caerphilly County Borough Council building control, with inspections managed at each stage.
How long does a house extension take to build in Trethomas?
It depends on the size and complexity. Most single-storey extensions take several weeks, while larger or two-storey projects can take a few months. We give you a clear schedule after surveying your Trethomas property.
What types of house extensions do you build?
We build rear, side, wraparound and two-storey extensions, as well as kitchen and open-plan living extensions for homes throughout Trethomas.
Which areas around Trethomas do you cover?
We cover Trethomas and the wider Caerphilly County Borough area. You can also explore our full range of home renovation services in Trethomas.
Sources: Planning permission (GOV.WALES) · Building regulations (GOV.WALES) · Caerphilly County Borough Council
Let’s Discuss Your Project
Ready to move your project forward? Let’s start the conversation and explore how we can bring your plans to life with the right expertise and attention to detail.