House Extensions in South London

With two decades of experience, our company has overseen numerous house extension projects.

We pride ourselves as the experts in this field, offering you the opportunity to view similar projects in your area.

Meanwhile, feel free to explore our Testimonial and Gallery pages.

View some of our Extension Projects

Open plan Kitchen Edna street

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A contemporary open-plan kitchen extension completed on Edna Street, Wandsworth, South West London. The project includes rooflights, bespoke kitchen finishes and a bright dining area, delivered by Excel Construction.

Our Process

We manage every stage of your project—from design, planning and Building Regulations compliance through to construction and quality control.

Our in-house designers work closely with you and your consultants to develop the best possible solution within local planning requirements.

Our supervisors visit the site regularly throughout construction to monitor quality, progress and programme. Each stage payment is assessed against completed work, giving you greater clarity and control over project costs.

Building Control also attends at key stages to inspect the work and confirm compliance with the Building Regulations.

A typical house extension takes approximately 8–12 weeks to complete, depending on its size, complexity and specification.

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Client Testimonials

“Excel Construction built our kitchen extension. The project was well managed and delivered on time. Alex and his team were very professional and the communication with us was excellent. Highly recommended.”

S L-J

“Excel Construction have undertaken a kitchen extension, porch, driveway, garage roof and loft extension for us to date. Each time we have been really impressed with the quality of their work and their consideration in tidying up after each day and being respectful of our living environment. Overall, we have always had a really positive experience with the Excel Construction team and we would have no hesitation in recommending them to anyone.”

Catriona Lumiste

“Excel are a very professional team - with good quality work and no delays on our project. Really happy with their works.”

Excel Construction extensions, new builds and loft conversions

Ciprian Muraru

FAQ

House Extensions

Do I need planning permission to build my home extension?

The need for planning permission for a home extension depends on various factors, including the size, location, and specific circumstances of your property. Some home extensions might fall under permitted development rights. This means they can be built without the need for planning permission as long as they meet certain criteria regarding size, placement, and other restrictions. We will explain this to you in detail and arrange all local authority permissions that are specific to your project.

How long does it take to get permission for my home extension?

On average, for standard applications, the timeframe to obtain planning permission for a home extension can range from a few weeks to several months. If your project qualifies as permitted development, you might not need formal planning permission, and the assessment can be quicker.

How long will my extension take?

The construction phase itself can vary depending on the scope of work, the materials used, the number of workers involved, and the weather conditions. On average, a house extension might take several months to complete. For example:

A single-story extension might take around 3 to 6 months.
Double-story extensions or more complex projects could take 6 months to a year or longer.