Conservatory Guide

At Creobuild, we know you will have questions about your proposed conservatory and will need conservatory advice from conservatory professionals. We hope that some of your questions will be answered in this conservatory guide which features a list of frequently asked questions. Please feel free to contact us should you need any further advice when deciding on your conservatory.

Do I need planning permission for a conservatory?

There a four factors to consider when planning your new conservatory and whether you will require planning permission or building regulation approval, these are:

  • The height.
  • The depth.
  • The distance from any boundary or highway.
  • The area of your garden that is already developed.

Your conservatory will not require planning permission from your local authority if:

  • It will be sited on the side of your home and will not be wider than half the width of your home as it was first built (before any other extensions were built, including those by previous owners).
  • It will be sited on the rear wall of your home and the depth will not be more than 3 metres if your home is attached or 4 metres if your home is detached.
  • It will be only single storey and not higher than 4 metres or the highest point of your existing roof.
  • It will be within 2 metres of a boundary and the eaves height will not be more than 3 metres, and not higher than the eaves height of your existing home.
  • It will not be forward of the common building line or existing elevation which fronts a highway.
  • Not more than 50% of your garden is already built upon, or will be once your proposed extension is complete. This includes any outbuildings which may already exist.
  • Your home is not sited on designated land (e.g. conservation areas, areas of outstanding natural beauty, etc.).

Do I need building regulations approval for a conservatory?

Most conservatories will not require building regulations approval from your local authority, unless:

  • It will be more than 30 square metres in floor area.
  • Less than 75% of the roof area or less than 50% of the wall area will be made from translucent material (in which case it will not be classed as a conservatory).
  • The conservatory will not be separated by external doors.
  • You will be creating a new structural opening between the conservatory and your existing home.

How much does a conservatory cost?

Conservatories vary significantly in their style, dimensions and specification and the key factor which will determine the cost of your conservatory is the type of ‘conservatory’ you decide upon.


The average cost of building a conservatory in the UK is £9,000 for a uPVC conservatory comprising of Low-E glazing, a lean-to roof and measuring 16 square metres in ground floor area. An equivalent conservatory with a gable or hipped Edwardian roof will cost in the region of £11,000, but will create a grander feel to your conservatory.

In terms of roof materials, a polycarbonate roof is a lower cost alternative to glass and although may not be as visually appealing, it does have some benefits over glass (namely increased sound and heat insulation).

Sun room, sun lounge or garden room

Sun rooms generally cost more than fully glazed conservatories but less than solid extensions. The average cost of building a sun room in the UK is in the region of £17,000 for a room measuring 16 square metres in ground floor area.


Orangeries are traditionally constructed from solid walls with hardwood fenestration, doors and roof lights. Orangeries can vary substantially in their costs based upon the level of finishing detail you require. As a very general rule, an orangery measuring 25 square metres in ground floor area and fitted with hardwood fenestration and doors would cost upwards of £50,000, whereas an equivalent orangery fitted with uPVC fenestration and doors would cost in the region of £40,000.

We hope you found this guide useful, please contact us if you would like further advice and a free estimate on your conservatory project.

Conservatory Guide


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