Conservatory base

7 Oct 2021
Reaction score
United Kingdom
I am having difficulty getting the correct answer. I've had 2 different builders telling me completely different answers.
I am looking a build a conservatory/ garden room joined to the back of my house. There is already a 3m longe by 2m wide concrete slab. This is approximately 300mm deep. I want to build 3mx3m. So my question is
Can I use the concrete base and build a trench out 1m to get the desired size or do I need to remove the base and dig in a new trench entirely?
I plan to use breeze blocks to create a double skinned dwarf wall.
Additionally, do I need a damp course on the original base or wil the blocks do this ?
Thanks Neil
Sponsored Links

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local