Planning Permission for Conservatory | Step-by-Step Roadmap

Since planning laws pertaining to conservatories have been relaxed, it’s seen an increase in the number of families extending homes in preference of relocating. Therefore, the question “Do you need planning permission for a conservatory?” becomes more relevant than ever.

When you want to extend with a conservatory, it’s important to understand the legal requirements of planning permission and building regulations. 

After reading this blog, it will become clear as to do you need planning permission for a small conservatory, or one of a bigger size, as you will be up-to-speed with everything that could arise.

conservatory extension planning permission
Conservatory Extension Planning Permission

What is Planning Permission for Conservatories?

Local Planning Authorities are in charge of taking care of planning requests for conservatory installations and these rules exist to deter inappropriate development. 

Planning permission grants you the power to build something new at your home and make a change to its use in some way. 

Building without planning permission, where it’s required, can be a costly mistake and lead to severe consequences if the structure is deemed to e.g. spoil local heritage and conservation. 

A retrospective planning application will have to be put in, and if it is refused with an enforcement notice imposed, it could see you left with no choice but to carry out some expensive alterations, or worse, be told to demolish the structure – it does happen and we’d hate for you to be the person who ends up in this nightmare situation. 

When Is Planning Permission Required?

How big can a conservatory be without planning permission? Well, if its building footprint covers an area greater than 50% of the area covered by your original house, you’re going to have to get it. 

Conservatories that will be positioned at the front or side of a property will also normally require planning consent. 

If any of the conditions outlined for permitted developments will be breached, that will too necessitate the filling out of and submission of a planning application. 

There are conservatory companies out there who will expect you to check if you need planning permission and take care of applying, but we’re not one of them. This will all be done for you so that you can focus your mind on organising the design. 

When Is Planning Permission Not Required?

Where permitted development rights come into play, you don’t have to be concerned about do you need planning permission for a conservatory and can just crack on with having it built. 

It was in May 2019 that the Government relaxed the rules relating to permitted development rights so that householders could have larger extensions added to their properties without being subject to planning permission. 

By law, those living in a terraced or semi-detached home can extend up to 6 metres and you can have a structure of up to 8 metres if your property is detached. 

Understanding Building Regulations for Conservatories

While planning permission and building regulations approval both need to be applied for via your local council, they are not the same thing.

Planning permission is all to do with how a development, like an UPVC conservatory, will impact its surrounding environment. 

Separately, building regulations exist to ensure that a development is structurally safe, accessible, sustainable, and offers sufficient health and safety to its occupants.  

Some sunroom additions require planning consent and building regulations approval, but most often, it’s only the latter that you have to take care of. 

These are the main considerations for the two:

Planning permission:

  • Aesthetic appearance
  • Use
  • Light
  • Privacy
  • Traffic and public transport
  • Environmental impact

Building regulations:

  • Safety (structural, fire for example)
  • Accessibility
  • Health impacts
  • Energy conservation

Basic Requirements of Building Regulations for Conservatories

A consultation with your local building control will be a good starting point to gain confirmation of whether your glazed structure is going to need building regulations approval or not. 

What they say will be decided on the basis of the conservatory satisfying energy efficiency, structural integrity, architectural compliance, and safety measures. 

Glazing in “critical” locations must also either:

  • break in a way unlikely to cause injury;
  • resist impact without breaking; or
  • be shielded or protected from impact.

It too is recommended that a conservatory does not affect ladder access to any windows present in a loft conversion or room in the roofspace. 

Do Conservatories Need Building Regulations Approval?

Extension guidelines make conservatories exempt from Building Regulations Approval when they fit the following criteria:

  • They are built at ground level and are less than 30 square metres in floor area.
  • The conservatory is separated from the house by external quality walls, doors or windows.
  • There should be an independent heating system with separate temperature and on/off controls.
  • Glazing and any fixed electrical installations comply with the applicable building regulations requirements.
  • The conservatory is single storey.

Building Regulations Approval is compulsory in an instance where you are intending to have a new structural opening created between the conservatory and the rest of your home. 

Do you need planning permission for a conservatory is an entirely separate issue and not to be confused with building regulations. 

How to Navigate the Planning Permission Process

A conversation should be had with your local authority if you wish to find out anything, like how big can a conservatory be without planning permission, as they’ll always put you on the right track. Hold back on an application until this discussion has taken place. 

Applications get submitted via The Planning Portal and once in receipt of it, the local authority will evaluate the enclosed documents and get feedback from any affected neighbours on the proposed plans. The public consultation period will last between three and eight weeks. Any objections raised may not necessarily affect the resulting decision. 

It will need to include the completed application form and fee, along with a location plan and site plan, and depending on what you’re proposing to do, statements on design and access, ownership certificate, and the elevations of both the existing and the proposed designs.

Applying for Planning Permission

A big perk of appointing Hazlemere is that we’ll see to the planning permission for a conservatory, saving you the job of applying. However, it is still useful for you to be aware of how the application process works. 

Applications are best sorted online and you do it via The Planning Portal, where you can fill out the relevant information, pay the application fee, and upload any supporting documentation such as plans and drawings. 

Email applications are allowed and just need you to download the planning application forms from The Planning Portal and fire them over digitally once completed to your planning authority’s email address, which you’ll find on their website. 

As of 2024, it costs £258 to make a full planning application for an alteration/extension to a single dwellinghouse.

Eight weeks is the average time to be told if a planning application has been accepted and where granted, it is  valid for three years from the time of approval.

What Happens if Planning Permission is Denied?

It’s immensely frustrating to see a planning application turned down but you don’t want to lose hope in gaining conservatory extension planning permission. 

You will be told in writing the reasons for an unsuccessful application and this feedback can be used to modify your plans to increase your chances of a subsequent application being greenlit. 

There’s nothing to stop you from talking to them to understand how and why they have reached this decision. 

Appeal against their ruling if you believe it is unjust, but keep this as a last resort. 

Key Points on Planning Permissions

When do you need planning permission for a conservatory is something that every aspiring conservatory buyer wants to know.

The conservatory size (not allowed to be any bigger than 50% of the area around the original house), its location, and the property type where it is due to be installed will all be a factor in determining whether a planning application needs to be put in. 

Compliance with the guidelines for permitted developments entitles you to move ahead with a conservatory installation without having to worry about planning laws or neighbour consultation, helping the process advance forwards more quickly. 

Permitted development rights can be overridden when an Article 4 direction is imposed by a local council, but we’ll ascertain if it applies in your area. 

Your Questions, Answered

What makes a conservatory not an extension?

It’s hard to differentiate some conservatories and extensions if you don’t know what each of them traditionally encompass. 

A conservatory is largely made up of glass, with at least 50% of its walls and 75% of its  roof glazed, and it also has a small brick base and sometimes dwarf walls to support it. 

Extensions have a lower percentage of glazing and tend to be constructed from materials that are harmonious with the same materials used to build the house where they’re installed for a consistent look. Most modern varieties of extension include a solid roof and brick walls. 

Do I need permission to put a solid roof on my conservatory?

Updating your conservatory’s current roofing system with a solid roof covering can uplift thermal efficiency to return it back to a consistently usable space. 

Adding a solid roof to glazed extensions is a quick process, but you may be curious to know if such a home improvement needs planning permission to conform to local authority regulations. 

Generally, no prior planning consent is needed, unless you live in a listed building or conservation area. The conditions it has to meet are published on the Planning Portal website, so give them a read. 

If it involves replacing an existing glazed roof, there’s a chance approval will have to be sought from the Building Control department at your local authority. 

Hazlemere will clarify where you stand as part of the service we provide to customers. 

What is the 4 year rule for conservatory planning permission?

An unlawful property enhancement, one that required planning permission but was either refused it or where a householder omitted to obtain authorisation, can become lawful under the 4 year rule once it’s been standing for that length of time. 

It can apply to several kinds of structural extension, but principally to the use of any building (or part of a building) as a dwelling (house or flat). 

Furthermore, the 4 year rule also relates to most building works, just so long as the use of the site hasn’t changed, such as the extension of an existing building. 

Do I need a neighbour’s permission to build a conservatory?

Homeowners pondering a conservatory installation may wonder if they need to notify a neighbour on either side of their property and gain approval from them ahead of having one constructed in case of any objections. 

Where permitted development rights apply, you can proceed without authorisation or building consent from adjoining residents or your local authority as the design specifications meet the relevant conditions. 

You might need to obtain a Party Wall Award when excavating near a neighbouring house to construct this type of extension, giving your neighbours two months’ notice in writing of your intentions. It’s up to them if they retort with written consent. 

If you find yourself unsure of where you stand, consult with us  and/or the relevant planning committee to set you in the right direction. 

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