Architect drawings / costs

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Hi, currently planning a small 3 x 3.6m extension to the back of my house, this squares off a previous extension. Very very simple build that will become a bathroom.
just been getting a few quotes for plans from architects and structural
Engineers.
Currently quotes are varying from £1500 + VAT for basic architect drawings - £1000 for structural engineer… plus all the other costs. It’s blowing my mind how much it costs before you even break ground! I was hoping to do the footings and a fair bit of the roof myself along with the floor and all the internals and bring it in between £1k-£1500 PSM.

I suppose my question is : how much of the drawings can I do myself?
Are there any work arounds when it comes to the architects fees? Cheaper ways to do it?

Structural engineer - should I just get lots of quotes on? I know there’s nothing I can do to diy that but the prices are wild.

Have added the current floor plan and the proposed layout I want.

Any help / advice is much appreciated.

Angus - north east Scotland.
 

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For a simple job like this you only need a decent technician for the drawings and any simple beams. A grand plus fees would be my charge.

Nothing to stop you doing your own drawings but you'll have to sort all the details out.
 
For a simple job like this you only need a decent technician for the drawings and any simple beams. A grand plus fees would be my charge.

Nothing to stop you doing your own drawings but you'll have to sort all the details out.
Are you an architect or engineer?
As far as I’m aware there would be no steels
Or anything needed, just footings two walls and a flat roof! No load bearing walls to come down either The highest quote I’ve had for architect and engineer - all fees was over £5k which makes the extension pointless if that’s the starting point. I’m not trying to be cheap or stingy I’m just trying to be clever with a limited budget you know .
 

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