Extension plans and drawings

Single storey kitchen extension drawings, two storey extension drawings - all with no site visit!

Building extension drawing plans online

Extension plans, taken care of


Maybe you are fancying a new open-plan kitchen/diner or maybe a couple of new bedrooms upstairs? Lots of house extensions don’t require Planning Permission these days but many still do. Even if your extension plans fall under ‘Permitted Development’, it is still extremely likely that you will need some form of Architectural Drawings. We are absolute experts in providing cheap extension plans online for planning permission or a Lawful Development Certificate.


You may need…


Extension Planning Drawings / Permitted Development Drawings

You can check the UK Government guide HERE to see if your extension plans are likely to need Planning Permission. Even if your extension is considered Permitted Development (ie. doesn’t need Planning Permission), it is still a good idea to get a Lawful Development Certificate. This is basically just written confirmation from your Local Authority that you can build without Extension Planning Permission and definitely aren’t breaking any rules! The Lawful Development Certificate will also come in handy when you eventually come to sell your home. The Lawful Development Certificate Application requires extension drawings of the exact type you would normally use for a Planning Application.

Extension Building Regulations Drawings

Your extension will almost definitely need Building Regulations Approval by either your Local Authority or an Approved Inspector. You can do this one of two ways;

1) A Building Notice
This is just a form that states you are building an extension and it enables the inspectors to quote your fees and tells them to expect to carry out some site visits soon. There are no extension building regulations drawings produced with this option and you or your builder can submit the Building Notice.

2) Full Plans Application
This is the one we would recommend as Architectural Building Regulations Drawings are produced by us and are pre-checked by the Building Control Officer before building work starts. This means you can be entirely confident that you will not be building anything non-compliant and have to make costly corrections. The extension building regulations drawings we produce include all the relevant detailed section drawings, a specification and all relevant building notes to get you Full Plans Building Control Approval. Your builder will also have nice detailed extension plans to work from, further reducing the risk of mistakes on site.

We are planning and building regulations experts. Your online plans will be ready FAST.

Step by step


Step 1
Get your quote

Step 2
Upload your measurements and house photos

Step 3
Sit back and relax

Step 4
Receive your plans in PDF format

Arkiplan building plans

Payment Promise


We don’t do spiralling costs or unexpected fees. That is NOT our style. The price you see is the price you pay. To book your project in, you will pay only £49 of the total price today and we will request the remaining amount when your  first set of drawings are completely finished and you are 100% happy with them.

Payment promise

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Get your online instant quote today, with no obligation to continue - easy!

On average, our customers save £3000* with us, rather than using a traditional architect – that’s a brand new kitchen to go in your extension!

(*Based on avg. extension cost of £50k and avg. traditional Architect fee of 7.5%)

Arkiplan online building planning drawings

Extend your inspiration

We live and breathe architecture and building projects, so much so, we’ve created a collection of our favourite home extension ideas on Pinterest – take a look at, there are some amazing ideas out there!