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Planning Permission Guide

An extension to a house may be considered to be a permitted development if it satisfies certain limits and conditions, which eliminates the need for a planning application to be made.

Know what to check first

Before choosing a conservatory, orangery or extension, it helps to understand whether planning permission may be needed. Many projects are allowed, but rules depend on your property and design.

  • Check your home’s planning position.
  • Consider size, height and location.
  • Ask for advice before committing.
Checking for Planning Permission

When permission may not apply

Some living spaces may fall under permitted development, meaning a full planning application is not always required. The design must still meet specific limits and conditions.

  • Rules usually apply to houses only.
  • Flats and maisonettes are different.
  • Previous extensions can affect allowances.
A home improvement advisor chats to a couple

Treated like home extensions

Conservatories and orangeries are usually assessed under the same planning rules as other house extensions. Whether permission is needed depends on size, position and overall design.

  • Rear designs are often simpler.
  • Front-facing designs need more care.
  • Height and boundary rules matter.
Conservatory Living Space

Larger projects need checking

Extensions can often be possible under permitted development, but larger or more complex designs may need planning approval or prior approval from the local authority.

  • Size limits must be followed.
  • Neighbour consultation may apply.
  • Design should respect the home.
Stone Orangery Extension

Extra rules may apply

If your home is listed, in a conservation area or affected by an Article 4 Direction, standard permitted development rights may be restricted or removed.

  • Always check protected status.
  • Extra approvals may be required.
  • Local rules can be stricter.
Envisage Flush Cottage Windows

Design affects permission

The size, height and position of your living space can influence whether planning permission is required. Boundary distance, roof height and garden coverage are especially important.

  • Avoid exceeding permitted limits.
  • Consider neighbouring properties.
  • Keep proportions sensible.
Living Space Extension with Bi-Folding Doors

Separate from planning permission

Even when planning permission is not required, building regulations may still apply. They focus on safety, structure, insulation, glazing, ventilation and electrical work.

  • Planning and building control differ.
  • Most extensions need approval.
  • Conservatory exemptions have conditions.
Building Regulations Approval

Confirm before work begins

Your local planning authority can confirm whether your project needs permission. Written confirmation can provide reassurance before making final decisions or starting installation.

  • Check with your council.
  • Keep written records.
  • Avoid assumptions from similar homes.
Sales Support from TWC Advisors

Helpful local guidance

TWC can help you understand the practical design considerations when planning a conservatory, orangery or extension across Wiltshire and Oxfordshire.

  • Clear advice from experienced advisors.
  • Designs tailored to your property.
  • Support through key decisions.
TWC Home Improvements

Practical choices from the start

A well-planned living space considers appearance, size, comfort and compliance from the beginning. TWC helps shape designs that feel right for your home.

  • Style matched to your property.
  • Options explained clearly.
  • Sensible layouts and proportions.
Conservatory Living Space

Make informed choices

Planning rules can feel confusing, especially if your home has been extended before. TWC can help you ask the right questions early.

  • Understand possible restrictions.
  • Compare suitable design options.
  • Move forward with clarity.
TWC Showrooms & Helpful Advice

3 steps to planning your new living space

Start with the basics

Confirm your home type, location, previous extensions and any restrictions before choosing your preferred living space design.

Plan around the rules

Think carefully about size, height, roof style, boundaries and garden space to keep your project practical and suitable.

Get helpful guidance

A TWC advisor can discuss your ideas, explain design options and help you plan the next step with confidence.

Get help & advice on your new living space?

TWC advisors will guide you through every living space option any any planning rules, helping you choose the perfect design for your home. Request your tailored quote today.

TWC helps homeowners create beautiful, practical living spaces designed around their homes and lifestyles. From your first enquiry to the final installation, our team focuses on helpful advice, quality products and a smooth customer experience.

Explore conservatory options that can be tailored around your home, taste and how you want to use the space.

TWC uses carefully selected products, materials and finishes to create conservatories that look good and perform beautifully.

Our experienced team is here to guide you through the design, planning and installation process with care and attention.

TWC offers a 20 year guarantee on windows, doors and living spaces, giving you lasting reassurance in your investment.

Get in touch with TWC online

Simply fill in your details and send us your enquiry. A TWC advisor will get back in touch to discuss your enquiry.

Want to speak with a TWC advisor? Call 01793 781413

Our friendly team will be pleased to help with any questions you may have.

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