Professional House Extension Services – Single-Storey, Double-Storey & Wrap-Around Extensions

At Cowley Construction, we specialise in high-quality house extension services across North West England and North Wales, delivering expertly built single-storey, double-storey and wrap-around extensions tailored to your home and lifestyle.

With over 20 years’ experience in domestic construction, our team offers full service from design and planning through to build-completion and handover.

Whether you’re looking to expand your ground-floor living space, add additional upstairs accommodation or seamlessly extend into a side and rear area, we bring precision, craftsmanship and clarity to every project.

We understand how important it is to maintain quality, minimise disruption and maximise value – which is why homeowners across the region trust us for extensions that not only enhance living but also boost property value and usability.

House Extension Services

Looking for House Extension Services?

We’ve got you covered.  Get in touch today for friendly and expert advice.

What are House Extension Services?

House extension services involve the planning, design, construction and finishing of additions to your existing home which enlarge floor space either horizontally (into the rear or side garden) or vertically (adding a second storey).

Depending on your property type and budget, this might include single-storey rear extensions, double-storey side/ rear extensions, side-return extensions or wrap-around layouts.

These additions give you the flexibility to create more living space, adapt for growing families or change how you use your home, while working alongside existing structure, materials and style.

Benefits of Our House Extension Services

  • Tailored living space – We build extensions designed precisely for how you use your home, whether that’s an open-plan kitchen diner, family room or extra bedroom and bathroom.

  • Increased property value – A professionally constructed extension adds market value and enhances appeal, making your home more desirable to future buyers.

  • Local expertise & compliance – Operating across North West England & North Wales, we understand local planning, building regulations, party wall requirements and ground conditions.

  • Seamless integration – We match materials, style and finish so your extension blends with the original property, giving a unified look and high quality finish throughout.

Our House Extension Build Services

We offer a comprehensive range of house extension build services to cater to diverse project requirements:

Single-Storey Extensions

Our team provides professional single-storey extension building services, which are:

  • Ideal for ground-floor expansion: kitchens, dining, family rooms or utility areas.
  • Efficient build process and minimal disruption when carefully planned.
  • Integrates bi-fold doors, glazed roofs and smooth transition to garden.
Ready to get started or want some more information?
 Get in Touch

Double-Storey Extensions

Our double-storey house extensions are perfect for expanding your living space, whilst adding value to your property. There are many benefits, including:

  • Adds significant living space both upstairs and downstairs in one project.
  • Suitable for additional bedrooms, bathrooms or creating entirely new layouts.
  • Requires careful structural planning and design coordination.
Ready to get started or want some more information?
 Get in Touch

Wrap-Around & Side-Return Extensions

We also offer a wide range of wrap around and side return extensions:

  • L-shaped or side-return plans maximise footprint without losing garden space.
  • Great for terraced or semi-detached houses in built-up areas.
  • Complex geometry but high impact on layout and lifestyle.
Ready to get started or want some more information?
 Get in Touch

What our Happy Customers Say

Sam Earlam

Jammy Chew

Very professional, would highly recommend!

emily harris

Eggy-John

kally mike

Gary Adams

Marcus Morris

Very professional, gets the job done and all round nice team.

Douglas Thorpe

Great company, professional and work to a high standard. Will definitely use again.

Jody Bufton

Fantastic company, Efficient and all work carried out to a high standard. Highly recommend

peri Stewart

Professional, reliable and fairly priced. Work carried out at a high quality, very happy customer and would
…

joshua freeman

H Baker

Used on multiple jobs. Will be using again, great experience every time

Jonathan Leech

On time, on budget and listens. Spot on.

Val 62

We had a really good experience using Cowley construction, would definitely recommend

Carl Smith

Great job from start to finish. We had a large rear extension, even completed ahead of schedule.
…

Frequently Asked Questions

Many single-storey rear extensions and modest additions may benefit from permitted development rights, but factors such as size, height, impact on neighbours, location (e.g., conservation area) may require full planning permission.

As experienced builders in North West England & North Wales, Cowley Construction will advise you on your specific property and local authority requirements.

Each project depends on size, specification, site access, and whether structural work is involved. A straightforward single-storey extension might take 8–12 weeks, while a larger two-storey or wrap-around extension could take several months. Early planning and clear brief minimise delays.

Costs vary hugely depending on footprint, specification, materials, site conditions and finishes.

We provide clear, itemised quotes tailored to your design and site.

Yes – our team ensures the new build works seamlessly with your property’s existing character, materials and finishes, or we can create a contrast when a modern design is preferred.

Absolutely — we coordinate design, structural calculations, Building Control submission, party wall notices (when needed), groundworks, build and hand-over to deliver a full-service solution.

We’ll discuss access, scaffolding, temporary storage, neighbour liaison and health & safety. It’s useful to clear the work-zone, secure pets and vehicles, and understand the build programme to minimise disruption.

Let’s Discuss Your House Extension Needs

Interested in our house extension services? Our team is ready to provide expert guidance and quality solutions tailored to your needs.