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PostPosted: Sat Aug 26, 2017 2:51 pm 
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Just had a quote for over £17,000 for a 3m x 3m conservatory; this was for Edwardian with French doors and attached to the back wall where already is a set of patio doors from a local firm. This quote includes everything and a 15 year warranty.

Someone suggested that that a windows/building friend could do the work for under £10,000, but it all depends on the cost of the foundations. No access to rear garden for any digging machinery.

The base cost of the Edwardian with French doors is £3000, set on a dwarf wall and raised floor which is 13" above the garden to allow the same level between the inside of house and conservatory.

My question is the depth of the foundations as they will need to be hand excavated and the overall cost of the foundations together with the dwarf wall and flooring.

I know they will be other work required; like electrical, plastering, gutering etc, but just need a 'ball park' figure for the foundations which may or may not include the wall and flooring.

Many thanks.

PS the area is in the South West of England.


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PostPosted: Sat Aug 26, 2017 2:55 pm 
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A 9m2 conservatory for 17 grand is expensive.
We do sunrooms with proper tiled roofs a good few grand cheaper.
However it's impossible to blind price a job on a forum. One will say x price and another will say y price.



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PostPosted: Sat Aug 26, 2017 3:34 pm 
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You can get micro diggers that will go through a normal doorway etc.



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PostPosted: Sat Aug 26, 2017 9:13 pm 
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Dave54 wrote:
You can get micro diggers that will go through a normal doorway etc.



The only access to the back garden is via a 26" wide door, will that micro digger make it?


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PostPosted: Sat Aug 26, 2017 9:32 pm 
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graham101 wrote:
Dave54 wrote:
You can get micro diggers that will go through a normal doorway etc.



The only access to the back garden is via a 26" wide door, will that micro digger make it?


No, micro diggers require 30" doorways.



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PostPosted: Sat Aug 26, 2017 9:34 pm 
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A 3x3 found is easy enough to dig by hand and concrete as well. You'll get a small mixer through the house easy enough and they'll not be that much earth to take out in tubs either.



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PostPosted: Sun Aug 27, 2017 10:35 am 
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steviejoiner74 wrote:
A 3x3 found is easy enough to dig by hand and concrete as well. You'll get a small mixer through the house easy enough and they'll not be that much earth to take out in tubs either.


Thanks for the info. Just one further question: As the garden is 13" lower that the floor will needs to be, is a concrete base needed for the suspended floor or would a layer of hardcode (say 100mm) on a weed control membrane be enough for the inside floor and the inner wall rafters used for the suspended floor support?

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PostPosted: Sun Aug 27, 2017 4:06 pm 
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You have 2 options.

assuming the ground is load bearing and not shrinkable clay, then you could remove the top soil, fit compacted hardcore, sand blinding, dpm and then a concrete slab.

Or you can do a suspended floor, in which case you only have to remove enough soil so you have a minimun gap of 150mm below the joists. The soil is normally blinded off for weed supression.

Given your location, have you checked if you are in a Radon gas area? In which correct detailing is needed for cavities and floor


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PostPosted: Sun Aug 27, 2017 8:59 pm 
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Thanks Notch1 for the information. and yes we are in a Radon gas area so need to think about ventilation and perhaps a Radon membrane.


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PostPosted: Sun Aug 27, 2017 10:02 pm 
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just checking your opening is 26" as opposed to 2ft6" quite an easy typo to make :lol:

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PostPosted: Sun Aug 27, 2017 11:51 pm 
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big-all wrote:
just checking your opening is 26" as opposed to 2ft6" quite an easy typo to make :lol:



Yes it is 26" unless you take the door off and get a few more inches, but not 30".


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