Single Storey Extension Plans

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Single Storey House Extension Plans

By adding a single storey extension to an existing property. You are not just adding value but expanding living space and enhancing the functionality of a home. Here are several types commonly considered: Rear Extension, Side Extension, Wraparound Extension. 

Each type of single-storey extension offers unique benefits and considerations, so it’s essential to choose the option that best suits your needs, budget, and property layout. Consulting with our architectural designers can help you explore possibilities and make informed decisions.

First, you need to decide what you want to achieve with your single storey extension. Do you want to create more space for your family or add value to your home? Once you have a clear idea of your goal, you can start planning the design of your extension. Consider the style of your existing house, the size of your garden, and the practicality of the extension. You can hire a professional architect or designer to help you create a design that meets your needs and fits your budget.

Single storey extension plans

Types of single storey extension layouts

  1. Rear Extension:

    • Extending the back of the house is a popular choice, especially for expanding kitchen or living areas.
    • It can create an open-plan layout, allowing for seamless integration of indoor and outdoor spaces.
  2. Side Extension:

    • Side extensions are ideal for homes with narrow or underutilized side spaces.
    • They can provide additional rooms such as a utility room, home office, or dining area.
  3. Wraparound Extension:

    • This type involves extending both the rear and side of the house, forming an L-shaped or U-shaped layout.
    • It offers ample space for various functions and can significantly increase the footprint of the home.
  4. Front Extension:

    • Front extensions are less common but can be beneficial for expanding the entrance or adding a porch.
    • They can enhance the curb appeal of the property and create a more welcoming entryway.
  5. Garage Conversion:

    • Converting an existing garage into habitable space is a cost-effective way to add a single-storey extension.
    • It can be transformed into a living room, bedroom, home gym, or additional storage area.
  6. Outbuilding Conversion:

    • Outbuildings such as sheds or workshops can be converted into single-storey extensions to serve various purposes.
    • They can be transformed into garden rooms, guest accommodations, or home offices.
  7. Sunroom or Conservatory:

    • Sunrooms or conservatories are glass-enclosed extensions that provide a bright and airy space for relaxation or entertaining.
    • They can be used as a greenhouse, dining area, or additional living space, depending on preferences.
  8. Orangery:

    • Orangeries blend elements of traditional brick-built extensions with the light and space of a conservatory.
    • They typically feature more substantial brick walls and a lantern-style roof, offering a balance between privacy and natural light.
  9. Lean-To Extension:

    • A lean-to extension is a simple and cost-effective option that involves extending from an existing external wall.
    • It is often used for creating small utility areas, cloakrooms, or additional storage space.
  10. Kitchen Extension:

    • Kitchen extensions focus specifically on expanding and enhancing kitchen space.
    • They can accommodate larger kitchen layouts, island units, and dining areas, catering to modern living requirements.

Planning Permission for Single Storey Extension

Depending on the size and location of your extension, most applications fall under the permitted development rights.  Planning permission exemptions allows you to build a single storey extension without needing to apply for planning permission from your local council. There may be cases where you need to apply for planning permission if go over height restrictions. Your architectural designer will guide you through the whole process and ensure that your plans comply with local regulations.

Permitted Development for Single Storey Extension

Permitted development rights for single-storey extensions provide homeowners with a streamlined process for extending their properties without the need for planning permission, subject to specific criteria and limitations.

Building Regulations for Single Storey Extension

Once you have planning permission, you’ll need to obtain building regulations for your single storey extension. This ensures that your extension meets the minimum standards for safety, health, and energy efficiency. Your architect or designer can help you with this process and ensure that your plans meet all building regulations.

How much are plans for a single storey extension?

Planning Package

Drawing Plans Only
£ 325 from
  • Site measurement up
  • Planning approval drawings
  • Submitting the relavant application
  • Site Plan
  • Location

Planning & Technical Package

Drawings Plans & Building Regulations
£ 495 from
  • As Planning Package
  • Construction Details
  • Working Drawings
  • Building Regulations
  • Liase with other Consultants

Building Regulations

Building Regs Only
£ 275 from
  • Building Specification
  • Sectional Drawings
  • Detailed Drawings
  • Call outs

Our process


Start by consulting with one of our team to discuss your project requirements, objectives, and any constraints or regulations that may apply. Then a site survey will be conducted


A conceptional design will be drafted. Where one our architectural designers will design a detailed planning drawings​, that will include site plans, sections & floor plans.


Prepare and submit your planning application, including the planning permission drawings, to the relevant local planning authority. Be sure to include any required forms, fees, and supporting documents as specified by the authority.


If your planning application is approved, you will receive planning permission to proceed with your proposed development. You can then use the approved planning permission drawings to obtain building regulations approval and begin construction

Single Storey Extension FAQ

In many cases, single-story extensions can be built under permitted development rights, meaning planning permission may not be required, provided certain criteria are met, such as size, location, and impact on neighbors. However, it’s essential to check with local planning authorities to confirm requirements.

The size of a single-storey extension you can build without requiring planning permission depends on various factors, including the type of property, its location, and any specific planning regulations or restrictions in your area. However, in general, there are certain limits and criteria for single-storey extensions that fall under permitted development rights. Here are some guidelines commonly applied in England:

  1. Detached and Semi-Detached Houses:

    • For detached houses, you can usually add a single-storey rear extension of up to 8 meters in length for a detached house, or 6 meters for other houses, without planning permission, subject to certain conditions.
    • For semi-detached or terraced houses, the maximum length is usually reduced to 6 meters for a rear extension.
  2. Height and Eaves:

    • The maximum height of the extension’s eaves should be no higher than 3 meters if it’s within 2 meters of the property boundary.
    • If the extension exceeds 2 meters from the property boundary, the maximum eaves height is usually 3 meters or the existing eaves height, whichever is lower.
  3. Materials and Appearance:

    • The materials used for the extension should be similar in appearance to the existing property to maintain harmony with the surroundings.
    • The extension should not include verandas, balconies, or raised platforms.
  4. Land Area and Size Restrictions:

    • The extension must not cover more than 50% of the total area of land around the original house, including existing buildings.
    • The height of the extension should not exceed the highest part of the existing roof.
  5. Listed Buildings, Conservation Areas, and Other Designated Land:

    • Special rules apply if your property is located in a conservation area, a National Park, an Area of Outstanding Natural Beauty, or if it’s a listed building. In such cases, permitted development rights may be restricted or require additional permissions.

It’s essential to check with your local planning authority or consult a planning professional to confirm the specific rules and regulations that apply to your property. They can provide guidance tailored to your circumstances and help ensure compliance with planning regulations before proceeding with your extension project.

To get started, get in touch with us using this form. Our team will assess your needs, evaluate feasibility, navigate planning regulations, and guide you through the design and construction process from start to finish.