Value for money extension design & planning application services....

It's Simple!

from just


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Planning permission can significantly increase your property's sale value....

It's True!

by as much as


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Professional planning & building regulation drawings for your extension...

It's Easy!

From just


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Prefer to talk to us? Contact us on…

0330 043 4142

or online here

Why choose our on-line design service?

Experienced & Professional

We believe that the simple ideas are the best ideas.

Our small team of construction professionals has over 100 years collective experience in the design and construction of a range of building types. We take the hassle out of the design and planning application process, with simple yet effective service options and a friendly and effortless interface.

Value For Money Options

Our on-line design capability enables us to offer a value for money nationwide service and we price our service options competitively, without sacrificing quality.

We are focused on helping you realise the potential of your property (even if you can’t) Let us unlock the potential of your property and maximise its value through alteration and extension design development and planning permission.

Time Saving Efficiency

We understand that time is precious and modern life makes it difficult to set aside significant periods of time for meetings - our time efficient on-line design service perfectly suits the needs of our clients.

We continuously develop and improve our services and welcome your feedback at any stage and use this to ensure that we can offer improved services in future to our clients.

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You Can Trust Us


Whether you are considering small scale modifications to your house, such as converting an existing garage to an office or gym, or planning a significant two storey extension and substantial alterations to your existing property, we are here to provide you with an affordable, friendly and professional design service.

Delivering Excellence....


Client satisfaction is the key driver for our success. Here at PlanExtend we firmly believe that delivering excellence to our clients is the best way to grow. People talk to each other and companies grow when satisfied clients trust us enough to suggest and recommend the services we offer to others, generating further business.

We turn your ideas into possibilities....

Quick, easy, professional

Choose your option

To start the process just choose a design service option that best suits you

Select your required service option using our ‘Lets Make Plans’ checkout process. Here you can choose the plan that best suits you, your property and your required design service.

You will be able select any add-on’s that may be beneficial and pay your 50% deposit. The Final 50% will only be payable when you are 100% happy with your plans.

Review and comment

We issue you with our starter pack & you give us some basic information

We will send you a link to download our starter pack that will give you everything you need to get started, including guidance for providing us with basic information for your design project.

Once your information is uploaded to our website our experts will translate the information you upload into plan & elevation drawings that reflect your existing property.

Get your plans

We develop designs to meet your needs & provide you with professional drawings

We will work with you to develop a number of extension options based on your initial brief which will enable you to select ideas and develop design concepts with us that best suit your needs.

We develop your preferred design concepts into proposed drawings and give you plenty of opportunity to comment to ensure the drawings are in-line with your preferences.

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Simple & Effective

Simple & Effective

We do all the hard work so you can sit back and enjoy the results...

Our process has been specifically designed to enable us to provide you with an uncomplicated, efficient and enjoyable design experience


Let's plan


Which PlanExtend service option best suits my needs?

Whilst we have tried to provide you with all the information you need on our website to enable you to make an informed decision we understand that you might have some questions, or your requirement might not fit within the structure of our standard options.

So if you would like further information relating to any of our service options, if you wish to discuss your specific requirements or simply ask our advice, please do get in touch – we are here to help!

Call us on 0330 043 4142 or email or visit our ‘Get in Touch’ page and complete the form.

How quickly can I expect my completed drawings?

Typical timescales relating to our standard service options can be found below. If you require drawings urgently we offer an accelerated turnaround ‘Add-on’. This can be selected when using our the checkout process:

Existing Drawings: PlanExtend – Option 1 Existing Drawings

  • Standard Service: 3 week turnaround (no charge)
  • Accelerated Service: 2 week turnaround (Optional Add-on).

Planning Drawings: PlanExtend – Option 2 – Planning Drawings

  • Standard Service: 4 week turnaround (no charge)
  • Accelerated Service: 3 week turnaround (optional Add-on)

Building Regulation Drawings: PlanExtend – Option 3 – Building Regs Only

  • Timescales differ dependant on extent of work.

Planning & Building Regulation Drawings: PlanExtend – Option 4 – Full Service

  • Planning Drawings Only – Standard Service: 4 week turnaround (no charge)
  • Planning Drawings Only – Accelerated Service: 3 week turnaround (optional Add-on)

The above timescales do rely on your prompt response to our queries and selection of design preferences etc as the design process progresses. Excessive time taken to respond to our queries or select design preferences may impact on our ability to meet the above timescales.

Will I need a structural design & calculations?

When the alterations proposed to your property involve changes to the building fabric which will affect the stability of the building a structural engineer will need to be appointed to provide the necessary calculations and drawings.

This structural information will also need to be submitted to Building Control in order to ensure compliance with Building Regulations.

Each design project differs and the need for structural calculations for your alterations will depend upon the nature of the project. Structural design and calculations are generally required prior to completing the following works:

  • Building an extension
  • Removing or modifying internal walls
  • Modifications to existing door and window openings
  • Underpinning walls
  • Modifications to existing roofs
  • Loft conversions (generally)
  • Removing a chimney breast
  • Fitting solar panels

The above is not exhaustive but provides a general guide.

When selecting the ‘Structural Calculations’ Add-on, PlanExtend will engage with a number of partner Structural Engineers on your behalf and obtain the necessary calculations and design information for your project. Our prices are very competitive!

Do I need planning permission?

Not all extensions and alterations require Planning Permission as some are covered under Permitted Development.
If you are unsure as to whether planning permission will be required for your ideal extension or alteration feel free to contact us as we are here to help.

What is permitted development?

Permitted development is the ability to undertake certain work to your property and use your property in a certain way, without needing to apply for full planning permission. These are called ‘permitted development rights’.

Permitted development rights are derived from a general planning permission granted not by the Local Authority but by Parliament. Many permitted development rights which apply to common projects for houses do not apply to apartments, maisonettes or other buildings. Commercial properties also have significantly different permitted development rights to dwellings.

Alterations falling under permitted development rights for ‘houses’ are summarised below:

  • Extension to the rear of a house
  • entrance hall or porch extension
  • internal alterations
  • conversion and occupation of a loft space
  • solar panels and other renewable micro generation equipment (excluding wind turbines)
  • satellite dishes, aerials and antenna
  • rooflights or dormer windows installed in an existing roof
  • replacement doors or windows.

All of the above are subject to specific design constraints, for example a porch has to have an area less than 3m³, rooflights and dormers windows installed in existing roofs must not face onto the highway, etc.

In some areas of the country, known as ‘designated areas’, permitted development rights are more restricted. In these area you will need to apply for full planning permission for certain work which would not need an application in other areas:

  • Conservation Area
  • National Park
  • Area of Outstanding Natural Beauty
  • World Heritage Site or
  • Norfolk or Suffolk Broads,

Permitted development rights also differ if the property proposed for development is a listed building.

Lawful Development Certificate (LDC)

The only way to be certain that that any proposed extension or alteration does not require planning permission and is covered by permitted development is by obtaining a Lawful Development Certificate (or LDC).

It is not compulsory to obtain an LDC for works falling under permitted development but we advise our clients to obtain this to avoid any risk of potential legal action by a Local Authority, to remove any ‘planning regulation’ ambiguity and ensure that the proposals are lawful.

PlanExtend will compile and complete the necessary documentation on your behalf and submit an LDC application to your Local Authority. This service is available as a free ‘Add-on’ which can be selected during the checkout process. You will be required to pay the planning fee’s directly to the Local Authority (we provide you with a web link for this at the time of submission), Typical LDC fees start from £86.

Did you know?

Obtaining planning permission for an extension to your property can increase its value by as much as 15%*


*without undertaking any building work

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