Obviously, when considering the timescale of the time it takes to build a conservatory, it very much depends upon the type of conservatory, the location, the materials being used and so on.

But, if we consider a standard uPVC conservatory of say 12 sq.m. on a normal uPVC home, with level ground conditions, then the build process should be as follows:

Days 1 to 7.  Normally a conservatory base team will take roughly a week to install the conservatory walls and floor.  The first day will involve moving any obstructions such as flags, and then starting the dig.  A good conservatory base team would dig foundations of at least 600mm deep, so all the soil needs removing and barrowing into a skip.  On day 2, or possibly day 3, the concrete would be poured in to create the foundations.  The foundations then need to set for a day or so before the builders start building the walls, and then installing the floor.

Days 8 to 14.  This period is normally a period where there is little activity.  Some companies take the measurements and then order the conservatory frames and glass.  Others will have already ordered the products, but the base needs time to dry out.  Frames can be installed straight after the walls have been built, but it's not ideal as the walls may still be 'green' and the bricks may move once frames are screwed to them.  Normally, in the second week of the build process, the electrician would visit site and do his first fix.

Days 15 to 20. The fitters will come and install the frames, glass and roof to the conservatory base.  Normally, this will take between 1-3 days depending upon the complexity of the design, weather conditions etc.  The fitters will get the conservatory into a position where the building is fully sealed, cleaned down, and the internal window sills are installed.  The fitters may need to install a timber floor (say chipboard) as well.  Then the plasterer visits site to plaster the walls if required. 

Days 21 to 35. The electrician would then have to call back to site and finish his wiring, install the sockets, lighting, fans, air conditioning units, electric radiators etc.  The conservatory is nearly finished, but there's still tradesmen required to finish off.  A joiner is required to install the skirting boards, and possibly fit a laminate floor.  The conservatory may need a tiled floor fitting, so a tiler would need to visit site for a couple of days.  There's also likely to be a degree of snagging, where any parts that have been accidently damaged on site, or missing from the boxes.  The conservatory will also need a good clean down, a bit of tender loving care before it's complete.

There are two other factors to take into account when considering how long it takes to have a conservatory fitted.  Firstly, if the conservatory requires planning permission, and many do, then it could take 8-10 weeks to get the planning application drawn up, submitted and then allowing the council time to process the application.  The conservatory company would then need to schedule the conservatory installation, but normally only once the application has gone through.

The other thing to consider is decorating and furnishing the conservatory, and on the outside you may need to organise some landscaping after the conservatory has been built.

Remember, a conservatory installation relies on a number of different tradesmen, many of which have other jobs to go to and finish off.  Most companies create a schedule which is the intended installation timetable, but please be aware they are subject to change!