I built my two storey extension for 20% of builder's quotes

This site shows how - step by step from design to completion

CAD Drawing your House Extension

If you want cheap planning permission drawings then the answer is drawing plans for an extension yourself. I was fortunate enough to have access to Autocad 2004 LT. You don't really need very fancy software to produce a good quality scale drawing. Draftsight is now a free alternative now available that I would strongly recommend. The cost of architect plans for single storey extension can be quite expensive but drawing plans for an extension free is perfectly feasible.

I measured up my house and started by drawing the existing property, whilst simultaneously teaching myself the software. The main tools I needed - drawing lines, trimming, extending, aligning etc. didn't take long to suss out. I would not claim to know everything about Autocad and am not the slickest user of it but my aim is to achieve what is needed for this project, not become an Autocad guru. It wasn't daunting, and I would certainly recommend CAD to anyone with even average computer ability. For what it's worth, when I got stuck I found online forums and YouTube videos more helpful than the Autocad help files. It didn't take me long to get myself a scale drawing of the existing property, and it was actually a lot of fun. I'm no expert, but if you are using Autocad and get stuck, feel free to contact me - I will help you out if I can. (I now use Draftsight)

If you are looking for house extension plans free download or extension drawing examples I suggest you  visit your local Council website, where all submitted plans are available to view. I download some plans from my Council Website and found that all architects have their own layout and style, but by seeing their approach you can get a pretty good idea of what is required for a drawing and how to lay it out if you plan to draw diy extension plans. My Local Council website also had advice on suitable scales and how to layout plans - I think it's likely your Council website will too.

Having accurately drawn the existing property, I was getting pretty au fait with the software and really enjoyed the freedom it gave me when drawing out the proposed extension. I like to use the drawing as part of the design process, so like to draw then shift things about - CAD is perfect for this. I drew up my plans, printed a couple out at A4 and showed them to friends and family for their input. I tweaked the plans quite a few times and even took some along to a self build show where an architect looked them over for me. He saw no major problem with them but did suggest one or two ideas I hadn't considered.