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Extension Double Storey

Double Storey extensions designed by a good architect or architectural designer adds space to the ground and first floor of your home, whether it’s on the rear or the side of the property we have double storey extension ideas to suit you.

The ground floor can have all the benefits of a single storey extension whether it’s for an open plan kitchen dining or extra space like a utility room. The first floor can then add bedrooms, bathrooms, en-suites, studies etc.

double storey extension morley
double storey extension pudsey
double storey extension pudsey


These large and visible extensions need careful thought. The additional spaces will be the same on both floors.

By making the first floor bedroom bigger it may create unneeded space on the ground floor, or visa versa however we can create extension plans to suit all houses and needs.
Any new bedrooms in your double storey extension need to have light, ventilation and means of escape. With two stories the planning limitations must be considered as the size and scale means it has to be designed to fit with its environment and neighbouring surroundings.

The regulations are stricter specifically concerning fire escape and structure.

You need to decide what you want to gain from the build, what you are willing to sacrifice and how much you have available to spend.

Double rear extensions must consider the overshadowing and loss of amenity/outlook form the neighbours if in close proximity to the boundary.

Site checks should be carried out on shared boundaries, party walls, mains sewers and if it is a listed building or in a conservation area special consideration should be taken.

The cost of a double storey extension as apposed to a single storey are to be considered but don’t let this hinder your plans as this can be discussed when designing your build.

Double storey side extensions are a great way of adding additional space without compromising garden space.

Design options

Once you know the room sizes required, you need to know how to access and ventilate them. Then you need to make the external of your new dwelling work well with the existing house. There are limitations in the planning guide for two storey extensions as they have more impact on their surroundings however we like to work with and enhance existing areas where possible as this means less building work, cost, disruption and impact.

Clear glazing will generally not be permitted at first floor level within 7 meters of a boundary due to the risk of over looking yet less consideration is needed on the ground floor and the use of glass can make your extension exceptional.

Getting a good balance is important, if the need for a bedroom is driving the extension, you will have to make good use of the ground floor, our architectural designers have extensive knowledge to help you get the balance right.

See our gallery to browse some built rear and side two storey extensions in Leeds Headingly, Holbeck, Pudsey, Morley, Castleford, Pontefract, Wakefield, Horsforth, Wetherby, Seacroft, Rothwell, Batley, Dewsbury, Tadcaster, Garforth, Swillington and the wider West Yorkshire.

double storey extension holbeck
double storey extension holbeck
double storey extension headingley

Planning Permission

Double storey extensions generally need planning permission as the permitted development rights only permit small sizes.

There are a lot of things to consider before submitting a planning application. How it impacts the street scene, does it enhance character, does it have negative effect on the neighbours, does it affect light/privacy/amenity. These are the things the planning officer will be checking whilst making their decision.
With our architectural services we will give you the right advice on how to achieve your requirements with the best chance of securing planning approval. We will prepare and submit the application on your behalf, then act as your agent talking directly with the council throughout the application.

See our full planning guide for everything you need to know before designing plans for a double storey extension or check out the planning Portal

You will definitely need a building certificate from a building control body, either local authority or private building inspector. We advise gaining the planning permission before paying for the detailed building regulations drawings.

Given the additional complexity of meeting the building regulations for a two storey extension it is essential that you get the plans approved prior to commencing any work.

The building regulations drawings will be submitted for a full plan checks, amended if necessary and once approved they will be the standard that is built to and inspection against.

Our plans for the two storey extension will include all the necessary detail such as structure, passage of sound, disabled access, drainage, resistance to moisture, collision, impact, heat loss, ventilation, light, emergency escape and much more. These drawings will be used when the building control officer inspects the build to ensure the builder is carrying out the works correctly.

You can commence works 5 days from submitting to building control, this is the minimum time due to having to consult the water authority.

double storey extension leeds
double storey extension leeds
double storey extension leeds

Building and Builders

Remember when you finally do come to build your double storey extension, only half of the building work will be outside therefore you should plan and phase exclusion zones with your builder.

With the approved drawings you can now approach builders to provide quotations and price. With any quotation you should consider it being written up clearly and with good detail. You will need to know exactly what is being priced for and any additional costs should unforeseen issues arise.

We have extensive construction knowledge to assist you and builder throughout if needed.

Use our drawings in line with the quotation and any additional information we don’t provide such as plumbing and electrics is agreed in detail before the first fix goes in. it will be costly changing things once the initial preparation has been built.

Our help and advice doesn’t end once you have the approved plans, we will help you throughout the construction process and visit site if required, we can also quote full project management in any package if you wish.


Project Management is quickly becoming a regularly requested service for double storey extensions with ourselves. For clients who simply wish for an experienced professional to take control and deal with the builders and build on their behalf.

In many cases we find that a lot of clients view new building work as daunting and disruptive to their lives.  It is our job within the project management role to minimize these concerns through applying an organised system which will ensure all the required processes and targets are achieved in the correct order and time on site. As a project manager we will provide vision and direction in your build. Typical responsibilities are planning, executing, and signing off projects, after defining the project, tendering, developing and implementing the staged work plan to budget. 

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