I think it is a lovely project to have - and good for you to want to preserve the building!

How about putting glass in the individual doors?

A few ideas on the chill out area.

As in photo below you could add a 'skylight' that is the same shape as the roof - so the apex is all light.

Shannon

Just a word of caution... this setup was once quite common in the area I live in too, and it was standard practice for each property to own their loo and have a legal right of access to it. So, there's a good chance that you only own one of those loos, and you could theoretically run into problems if you start renovating them while they belong to someone else. You need to check first and find out about possible consequences if they are still owned one by each property.

People round here often arrange to buy the loos from the neighbours, usually a smallish payment (£100 is common) plus of course solicitors fees.

What a beautiful building in addition to other ideas you could put one of those small domes right at the top of the roof which would pull in light. I think it's called a sun tunnel

I would keep it simple, buy 3 glass doors and paint frames black or dark grey, re point the stone work, put a nice rustic tiled floor, some quirky lighting then furnish with benches and garden chairs with lovely cushions and rugs!

I'd keep as much of the structure as possible. It would make a great library similar to this extension to a Tudor house we are working on at the moment.

Extension for a Tudor house · More Info

Hope this helps,

Joe

Suggest removing central door and replace it with glazing, hang left hand door so that it opens back against side walls, whitewash walls, flagstone the floors, rustic wooden shelves within for pots and dried flowers, wooden furniture with colourful cushions. You may well find you will never want to leave!

I'd keep the right hand door as is and put simple glazed panels in the other 2 door spaces. Keep it simple, all the way!

Good selection of ideas here. I would suggest you ask yourself what you would use it for: summer outhouse, quiet place to read, home office? What is next to the building, will you create a barbeque area or patio or flower beds to have more privacy from the main home? Once you know how you want to use it (and the space around it), you can decide how much insulation/ light it needs and what it needs doing. It will likely be an iterative process between what you want, the state of the building (agree that it would be nice to keep it) and your budget. To start, get a couple of builders familiar with heritage building to comment on the state of the stone walls, roof structure, and what work these would need. Once you know how warm the building will be, you can get started with layout and design. Don't forget to include the space around the building in the design. Good luck!

PS- Looking at the pictures again, it is a double skin wall, so I assume it should be somewhat warm. Don't know if you could/ would want to insulate the roof from below? Do check for any signs of wet/ dry rot before you begin. Good luck!

Definitely agree with previous, that you need to think how you're going to use it. Also, the aspect - how it gets the sun. My immediate reaction is to put a full height window in each end door, and have a glazed door in the middle, but if it gets sun from the other side, you may want to shut up the doors, with fake ones, retaining the look, and open up other side with glazing. Inside then, behind out of use doors, you could create shelving in each door frame. Planners can be very helpful with a 'pre-app', although it might be wise to check whether you need to get them involved at all. Lovely building with great potential!! Check out on houzz for sources of materials, and builders too! Have fun!

I would go for the 'keep it simple' approach as well. The shape of the roof looks really nice. I assume each of the toilets has a dividing wall which would need to come down as long as it's are no more than that. Glazing the doors would let more light in. The roof space could be used as well even if it was only to house a music system, book shelves or an appropriate collection of artefacts and memorabilia.

I'm a little late to the party but here's my two penn'orth; I think keeping the door at one of the ends would be batter than placing it centrally as it will intrude into an already small space less. The remaining two doors I think would look nice as full length windows, perhaps with black anodised or powder coated frames, keep one of the doors and upgrade it to use for the entrance if it is in good enough condition as it compliments the building.

The roof needs relaying but as mentioned the old clay pegs would be nice to retain as they suit the building and mostly look reuseable, the hips would benefit from proper hip tiles as opposed to the concrete that is currently there. I notice that on the sunward side (right) there seems to be glass or metal set into the lower part of the roof, although that will allow a lot of light in, I imagine it will also make the interior hot in the summer so you will need at least ventilation.

It looks as though there is enough depth to the rafters to be able to insulate between them with a faced polyurethane board so keeping the wood and it's character visible.

Repoint the interior with lime mortar as mentioned to keep the look and character of the stone and brick walls.

The roof would also benefit from gutters, a downpipe and a rain barrel, at least above the door and windows.

It is important to think what you would use it for. If, for instance, you might want to use it as a little art studio, then the glazing does not want to be on the sunny side. South facing glazing is not always the best thing - a little shade can be a welcome respite from a sunny sitting-out spot.

If it were mine l would leave it as close to the original state as possible. I would for sure convert the inside to a sauna and hydroshower and add a sun patio outside with comfy recliners.