In general, you will need planning permission for a temporary building if it is intended to be used for more than 28 days, and/or it will be bigger than 100 m², with certain exceptions for extensions. In all other circumstances planning permission is required, but retrospective applications may be made in an emergency or in cases of urgent need.
When Planning Permission is NOT Required
Under some circumstances, you may not need planning permission for your building, for instance if the structure has a floor space of less than 100 m² AND it is not going to be used for more than 28 days.
If the structure is an extension to an existing building, you may be able to avoid a planning permit if your building meets the following criteria, even if it is destined for longer term use:
- The building is shorter in height than the original building, and
- The temporary building is directly relevant to the purpose of the original structure, and
- The structure is less than 25% of the size of the original by volume.
When You Need Planning Permission
As a rule of thumb, if you plan on using your temporary structure continually for more than 28 days, and/or it will be bigger than 100 m², you should be prepared to submit a planning application to your local authority.
You will also need planning permission if any of the following apply:
- The building exceeds 25% of the total area available on your site, or in the case of warehouse and factory extensions, is more than 25% the size of the original building.
- The temporary building comes closer than 5 m to the boundary of your site
- The building significantly reduces the amount of land available for parking, and/or manoeuvring of vehicles.
When to Make Your Application
In most circumstances, we recommend making a planning application before you purchase or install your temporary structure. Submit the application with as much time as possible. This ensures you’re covered and there are no issues with your local authority. However, a planning application can take anything from 8 to 12 weeks, which can pose a problem if the structure is needed urgently. For this reason, some businesses choose to go ahead without planning permission. In this case, it is possible to acquire retrospective planning permission, if you can prove that the building is needed on an emergency or urgent basis.
In most genuine cases, the local authority concerned will grant retrospective permission without issue. However, if permission is not granted the authority could require you to restore the site to its original condition – i.e. request you to remove your temporary building. Failure to comply could result in an enforcement notice.
if you plan to use the temporary building for more than 28 days and it’s going to be bigger than 100m2, you should make an application to your local authority for approval.
Whether you do this before you have the temporary building installed, or whether you make a retrospective planning application due to the urgency of the space requirement, is entirely your decision.
Get the Guide
To help you with all this we have produced a helpful guide "Fast Track Your Planning". Please download the FREE guide from the top right corner of this page.
Please also note we offer a full in-house planning service - see below.
In-house Planning Service
We Do Not
Subcontract our planning work. Unlike other Temporary building suppliers, you may have contacted, we do not work with external consultant town planning companies.
Handle every panning application on your behalf in-house.
Every planning application we handle is managed totally in-house by our structural Engineer, Ross Vinter.
With a first-class honour's degree from Herriot Watt University, Ross’s structural engineering expertise is a huge benefit when handling planning applications on your behalf.
This also extends to him dealing with the Highways Agency, environmental agencies and Building Control Departments to satisfy any requirements each may have.
Government Requirements Government Website
Factory or warehouse extensions
Planning permission will not normally be required if your extension is:
- less than 100 square metres of floor space; and
- less than 25 per cent of the volume of the original building; and
- below the height of the original building.
- The extension must be related to the current use of the building or the provision of staff facilities.
Planning permission will be required if the extension:
- materially affects the external appearance of the building; or
- comes within five metres of the boundary of the site; or
- reduces the amount of space available for parking or turning of vehicles.
Permission may be granted for the erection of a temporary building to last seven years on land required for road improvements in eight or more years, although an application to erect a permanent building would normally be refused.
If you go ahead without permission, the local council (or National Park Authority) may ask you to make a retrospective planning application.
If it decides permission should not be granted it may require you to put things back as they were. You can appeal but if the decision is against you and you refuse to comply you may be prosecuted.
Our Recommendation and Practice
Simply that, you should obtain permission. However, you can have the building installed, and then make a retrospective application, if the planning officer asks you to do so.
And this is the way the vast majority of our customers go about it. Because if you make the application before you have the building installed, it can and most probably will, take months and months - time you probably do not have?
Applications should take between 8 - 12 weeks.
You can make a retrospective planning application if your need is urgent or in an emergency.
Building Specifications for You
Call us on +44 1827 330000 for free, accurate advice or email using this Contact Form and we'll get back to you quickly to answer your questions.