Conservatory questions

Arfa__

Although we have been thinking of moving, things are still up in the air and our plan-B or staying put involves adding a decent size conservatory to back of house. Primarily to add some dining area space to house. House is a small mid terrace (no side access to back) and I envisaged a conservatory of about 2/3 width of house, enclosing back door and kitchen window, then going back some way. Back of house faces East. See pic below.

I'm not really clued on this sort of thing, so have a few questions:-

Our boiler (5yr old) is in kitchen, with flue protruding horizontally out back of house, which will be in way. Can this be rerouted or must boiler be moved? If latter, can it go in the conservatory? The other part of back wall is our bathroom, which is tiny 2m sq!

Can the back door and kitchen window be ditched, to make clear walk through and serving hatch?

How big can we go without planning permission? How big would you suggest for a dining room to seat 4-6 ish?

We have our gas meter on the kitchen wall between door and window. Is this ok left as is? When we last looked at moving it, the conclusion was it would have to got to front of house, due to not allowed to have gas pipes going right through and out of house.

There is an open drain underneath kitchen window with sink pipe coming down to it on outside. I presume this can be covered.

There is also the stop tap under a little cover under ground, located close to boundary, which won't leave much room for conservatory wall that side. How wide and close to boundary can conservatory wall go?

Is it at all feasible with all of the above? If so, what sort of ball park figure should I anticipate?

Anything else I need to be aware of, check, find out etc?

System

you would have to re-route the flue, but there is a maximum distance this could be, so you would have to contact the manufacturer of the boiler to make sure this can be done and what the distance would be - it could run through the conservatory and vent to the outside, but this maybe a problem as it would have to be a certain distance away from any openings, which isn't too handy on a conservatory!

Normally with a conservatory there would be a door into it, which should be external door spec to thermally break the spaces, if you don't do this you would have to build a heated conservatory with a much higher spec than an average one as it would then be forming part of the insulation envelope like the external walls of your house.

permitted development rights can allow up to 26(?) sqm as long as it meets the other requirement, your local authority can provide you the information on what meets pd, although as your garden space is so narrow they might not like a conservatory if it cuts down on the garden space too much.

You could only get the meter moved with permission from the supply company and they would have to do it, or sub-contract to a local guy for £££

If there is any access to the drains being covered up (manhole or rodding eyes) that would have to be moved to somewhere else on the drainage line, you can build over drains but la's don't like you to cover the access into them with a building.

Arfa__

Bi-folding doors look impressive. I would have to move the gas meter to fit them though. And knocking down that back load bearing wall, hmmmm will be very expensive me thinks.

Reckon I'm going to have to get some conservatory companies round for quotes and natter about what's possible.

System

arfa, i would recommend speaking to your local planning office to make sure that you can have anything in your back garden before even looking at nice folding doors!