Outbuilding / Annexe




An Outbuilding offers detached additional space away from the home, typically at the back of the Garden. This building could be used for just one purpose such as a Home Gym or Hobby Room or divided into smaller spaces for a home office or garden room.

An Annexe building is also detached but creates separate living space, sometimes completely self-contained with their own Living Room, Kitchen, Bedroom and Bathroom. They are ideal for elderly parents that require care whilst avoiding a care home, or your son / daughter wanting that separate living space away from the parents as they get older.

An Outbuilding or Annexe can be achieved through planning in two ways: –

Permitted Development: Most Outbuildings can be achieved under your Permitted Development Rights, which most properties have, as long as restrictions such as limited height are taken into account in the design.

Householder Planning Permission: If you require your Outbuilding to be taller than PD Rights allow then you will need full planning approval. Also self -contained Annexes will require full planning from the Local Council, and a condition will likely be imposed saying it cannot be rented out separately. If you require a rental then this is full planning and could be treated as a new dwelling application.

We will discuss your project on-site at your home and together we can choose which application fits you best. We conduct a complete survey of your home, brainstorm design ideas with you and use our extensive experience for your bespoke project.

We will take care of the design and application submission for you, acting as your Agent to the Council and updating you throughout the process from start to finish. Our personal touch means you will deal with one person throughout the planning process, meeting your designer at your home for the survey and design discussion to share ideas and give advice.

Contact us today to start your dream Outbuilding or Annexe! 

Case Studies


Single Storey Side Extension

Based in South Birmingham, our clients required a single storey side extension that would add the ‘wow’ factor to their traditional home.



Based within the beautiful countryside of Ross-on-Wye, our client’s required a large Orangery for their barn conversion property.


Double Storey Extension

Based in Bromsgrove, Worcestershire our clients required a double storey side extension above the garage that would add much needed extra first floor space such as a bedroom and bathroom.


Double and Single Storey Extension

Based in Solihull, our clients required a major extension project comprising of a two storey side extension projecting out at the rear, with a single storey rear extension to square the facade off nicely.

Personalised touch

We have a simple 4 step process form taking the initial consultations to a site visit and good communication while we get the right design for you as well as ongoing support right through to the build.

Ready to Plan Your Space?

Why not drop us a line and we can take your dream to a reality with a free consultation to discuss your project?

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Michael Daarrzzett
Michael Daarrzzett
We used Robert to help us design our extension, his advice was spot on and his design drawings and knowledge of process with LA greatly helped us with submission and subsequent approval. Very pleased with service that Robert provided.
anthony maher
anthony maher
Extension drawings ltd did a first class job. Robert Shaw was very professional, helpful and provided excellent advice and support. He kept us fully informed and made the planning process straightforward and uncomplicated. I would highly recommend their services.
Richard Kenney
Richard Kenney
The whole design and planning process was made very easy and straightforward thanks to Rob. He listened to our brief, designed the perfect extension and managed it through planning on our behalf. He delivered all drawings promptly and explained any details we needed to be aware of. He took what we thought would be a stressful process and made it smooth and stress-free. I would whole-heartedly recommend his services.
Grzegorz Kuzimski
Grzegorz Kuzimski
Rob has done the drawing for our front house extension(porch) in Worcester.His attention to details is on very good level.He responded to our emails and phone calls very quickly and answered all our questions promptly.Definitely 5 star service from Extension Drawing Ltd. Thank you Rob.Much appreciated.
Wouldn't hesitate to recommend. After contact Rob attended within a couple of days and he met every promised delivery made 👍 made very useful suggestions that we hadn't really considered. Price very reasonable too. Thanks
Richard Poole
Richard Poole
You hear how these processes are mired with difficulty and stress but I can honestly say with Rob at Extension Drawings it was no drama at all. For anyone requiring drawings and planning permission I wouldn't hesitate to recommend.
I found this company after a Google search and I’m glad I did, Roberts a really nice easy going down to earth guy to deal with , he went out of his way to help me as I’m in Oxford, he got me planning permission for a rear extension plus a loft conversion all within less than a 6 month time frame, excellent service and communication from start to finish Thank you Robert.
Amanda Roberts
Amanda Roberts
The whole process from start to finish was made very easy and straightforward for us by Rob, who was very informative at each step of the way.
Saleh Ahmed
Saleh Ahmed
Rob was very quick at responding and kept me upto date every step of the way during my application. Highly recommended.
Denise Wilson
Denise Wilson
We highly recommend Extension Drawings Ltd, if you are planning a renovation to your property. Robert & James have been absolutely amazing & helped us to realise our dream home. They have been extremely efficient by responding cuteously to our numerous emails and explaining the process each step of the way. Nothing has been too much for them. The process from our introductory meeting to receiving building reg approval and final drawings has been seamless. Thank you so much. A job well done 👏

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