Single Story

Leading Loft Conversion & Extensions Specialists

single storey extensions amersham
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Planning Permission for Single Storey Extensions

Before starting your single storey extension, it’s important to understand the planning permission process and how it affects your project. At Two Kings Construction Ltd, we handle everything from initial consultation to securing the necessary approvals. Our experienced team ensures your extension complies with all local building regulations, saving you time, stress, and unexpected costs. With our expert guidance, you can focus on designing your dream space while we take care of the paperwork and planning details.

A Stress-Free Process, From Start to Finish

In most cases, single storey extensions can be built under Permitted Development rights, but certain restrictions apply. The extension must not exceed the maximum height limits, and it should not extend beyond the rear wall or side boundaries of the original house beyond the allowed distance.

At Two Kings Construction Ltd, we manage the entire planning process for you — from preparing technical drawings to submitting planning applications. Our aim is to make the experience completely hassle-free, allowing you to focus on your day-to-day life while we handle all the approvals and construction details with minimal disruption.

rear house extension with flat roof

Frequently Asked Questions

Do I need planning permission for a single storey extension?

Most single storey extensions fall under Permitted Development rights, provided height limits and rear wall or boundary distances are met. We confirm exactly what applies to your property during your free survey.

How much does a single storey extension cost?

Cost depends on size, specification and finishes. As a guide, a 4m x 4m single-storey extension with a lantern roof, windows and double doors, materials and labour included, has recently cost around £33,500. Every quote breaks down materials cost, labour cost, and any government documentation costs separately.

How long does a single storey extension take to build?

A typical single storey extension takes around 8–12 weeks from start to finish, depending on size and specification.

Can I combine a single storey extension with a new kitchen?

Yes — a single storey rear extension is one of the most popular ways to create a larger open-plan kitchen-diner. See our kitchen renovations page for more detail.

Do you charge for the first visit or quote?

No — we don’t charge for the first visit. Your survey and quote are completely free, with no obligation to proceed. Call us on +44 7746 181112 or email info@twokingsconstructionltd.com.

Ready to transform your home?​

Contact us today to schedule a consultation or to learn more about our services.