… floor levels are dictated by a heady blend of building reg’s, foundations, ceiling height and final finishes - you need to consider each of these - tricky!

What goes into the floor? Literally - hardcore, sand, insulation, a damp proof membrane - in many parts of the UK this will need to also be a radon barrier membrane, then the concrete or limecrete slab (more below). You should also consider slipping under-floor heating (UFH) cables or piping in there. Admittedly, UFH costs more, but it provides two things I like - no radiators and radiant heat (even heating throughout the room - no hot spots / cool spots and lovely warm floors).

As a slight aside, if you install under-floor heating ensure that you use appropriate materials when installing your finished floor - an appropriate adhesive for tiling or kiln dried (bone dry) wood. This will add extra cost but is essential.

The limecrete or concrete question is still one that is open to debate in my mind. Undoubtedly, there are environmental and ‘healthy house’ benefits from using lime. However, it’s also more tricky and expensive to use, is different from concrete (and therefore needs to be ‘understood’ by those working with it) and is more sensitive to weather conditions. My position is to use lime if the three B’s line up - that is, if the Build, the Builder and the Budget all allow or encourage the use of lime then use it!

For the record, we didn’t use limecrete at the barn.

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…for a conversion your hands are usually tied but you’ll need to consider insulation, finishes and any remedial work.

First things first, will the walls remain or do they need to come down? I’m going to assume they will remain as afterall, this is a site about CONVERSION…

Some questions to be answered…

Will some areas of the walls need rebuilding? Will you need to underpin some sections of the walls for greater stability? Do you have cracks in the wall that will nessitate restitching or partial rebuilding?

Pointing - (mortar not fingers) will your walls need repointing? If so with what materials? You may need to research the original construction techniques and materials so that you can achieve a sympathetic result.

Insulation. Don’t forget that insulation can be placed both internally and externally in the form of render or cladding. External insulation can be a great way to avoid losing internal space.

Rendering, painting or washing. Is there any reason, cosmetic or practical that you may need to apply a covering to the wall. For example, I had the end wall of the barn rough pointed and whitewashed in a attempt to increase water tightness.

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… construction material, requirements for attic space?…

Consider the following: Do you need to replace the roof?
The answer may be a resounding and obvious YES - you may have holes as large as tiles or a ridge line like a camels back. But there are more subtle reasons to replace a roof. To conform with insulation and ventilation related building reg’s, to get the attic space you need or to accommodate the solar or PV panels you intend to deploy, it may be easier, quicker and cheaper to replace, rather than fix up the existing roof.

Keep an open mind.

Protect your heritage
One aspect of the roof that I would retain where possible are the original roofing materials. The welsh slates I’ve kept are far superior in terms of durability and appearance to the more cost effective modern materials I would have likely had to use if an entirely new roof had been required.

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Your design ethos will be the very highest level of your design.
Beneath that the next level of your design is to define the major systems, materials and design elements that you want to incorporate into your project. No need to be too specific initially … start vague and define…
Here’s a checklist to get you started:

Steps [...]

Decide upon your design ethos.
Much as I hate the pretentious word ethos I think it’s essential to define what you want to achieve. To continue on a pretentious theme whilst shifting into the world of business speak to define your terms of reference.
For example, do you want a eco-minimalist, ‘healthy house’ or country kitchen [...]