Build an annex in the garden

When looking to build an annexe in the garden in the UK, how you go about it depends upon what you're looking to do.

For instance, if you're looking to build a garden room, as a games room or summer house, then this is usually a much easier process - see planning below. If, on the other hand, you're looking for somewhere for a relative to sleep in, as extra space, all sorts of new considerations start to come into effect.
 

What is an annex building?

An annex building is a separate living space, which is indendent from the main dwelling. Although an annex building usually brings to mind a separate garden granny annex, an annex can also be attached. So, an annexe can either be completely separate, such as a garden annexe, or incorporated into the main house, but separated into a discrete living space. For example, a garage might be converted into a separate annex and have a separate front door. Or the annexe might be an extension, with no connection to the main building, or perhaps a door entry between them.

Planning Permission and Building Regulations

Planning Permission:

Check if planning permission is required. Some garden annexes may fall under Permitted Development Rights, but this depends on factors like the size, height, and use of the annexe - if you sleep in it, it needs planning, for instance..

If the annexe is to be used as a separate dwelling, it is going to need planning permission, regardless of what else you may have read online or which company you've spoken to. The simplest way to find out the truth of the matter is to speak with your council and they will tell you exactly what you require.

Remember, if you build an annex in your garden and don't get permission, you may be asked to remove it by the council. It only takes one neighbour or passer-by to phone the council and check and you could be in for a difficult time.

Planning is one of those things that will hold up your build if you need it, so get onto this straight away. Contact us for details of an independent planning consultant who covers England and specialises in planning.

Building Regulations:

Ensure the annexe complies with UK Building Regulations, covering aspects like structural integrity, fire safety, insulation, and accessibility.  Your builder or supplier should be able to cover this for you. If you're building the annex yourself, you can get a local council building inspector to tell you what is needed and then sign it off  during the build and when you're done.

Design and Usage

Purpose of the Annexe:

Define the intended use of the annexe (e.g., guest accommodation, home office, gym). This will influence design and facilities required.

Size and Layout:

Plan the size and layout of the annexe to suit its intended purpose while ensuring it fits well within the available garden space.

Location and Impact

Positioning:

Consider the location within the garden, taking into account factors like sunlight, privacy, and proximity to the main house.

Impact on Neighbours:

Be mindful of potential impacts on neighbours, such as overlooking, noise, and loss of light. It may be advisable to consult with them during the planning stage.

Utilities and Access

Utilities:

Plan for the provision of utilities such as electricity, water, and drainage. This may require connection to existing services or installation of new ones.This needs to happen before you start the build.

Access:

Ensure there is adequate access to the annexe, both for construction and daily use. Consider pathways, lighting, and any potential impact on the main house's access points.

Environmental Considerations

Sustainability:

Incorporate sustainable building practices and materials where possible. This might include energy-efficient insulation, solar panels, or rainwater harvesting systems.

Garden Impact:

Minimise the impact on the existing garden, considering factors like tree preservation, soil health, and maintaining green space.

Legal and Financial

Legal Requirements:

Ensure compliance with all relevant legal requirements, including any covenants or restrictions on the property deed.

Budget and Financing:

Prepare a realistic budget for the project, including construction costs, planning fees, and potential contingencies. Consider financing options if necessary.

Professional Advice

Architect and Builder:

Engage with professionals such as architects and builders who have experience with garden annexes. Their expertise can help navigate the complexities of design, planning, and construction.

Consultation:

Consider consulting with a planning consultant or your local council’s planning department early in the process to clarify requirements and increase the chances of a smooth approval process.


If you're thinking of building an annex in the garden in the UK contact us to help you from start to finish,