Hi AndyMcD,
First off welcome to the forum.
You are starting off where I was just over a year ago so I'll have a stab at answering your questions from what I have gleaned from my experience.
1) What is the average lifespan of a static caravan if well maintained? Would you expect windows etc to need replaced during this lifespan?So as for average lifespan, I can't tell you that. What I can tell you is most parks have a maximum age on their park that a 'van can be there. Mine is 15 years. (Can be rented through their scheme for just 10 of those)
2) In terms of caravan externals, how often do static caravans need cleaned, how is this cleaning done (jet wash or whatever, do any special chemicals need used)?This will be mostly down to where the van is located. If by the coast you have the pesky birds to deal with. If under a tree, you'll have leaves etc to clean out of the guttering come autumn. I would say once a year should be fine. That is what we do and we are by the sea and under a tree. We don't use any particular chemicals, jet wash for the decking, lower the pressure for the van itself and also use a bucket of soapy water for any tough bits. We make sure we pay special care with the jet washer around any seams etc to make sure we get no water ingress or damage any seals/sealant.
3) Do they become excessively hot in summer or excessively cold in winter?Yes and yes. They are basically a poorly insulated tin box. So in the summer will be pretty warm and in the winter a fair amount of gas to keep them warm. Never leave your dog, or any pet, in the van in summer. It will get scorching inside.
4) In terms of summer and winter costs, what would gas & electric costs be approx for a week's stay.A week is a very hard one to guess for me so I think I'll let someone else answer that. We have an EV that we plug in to the van and that warps price somewhat. What I would say, the price of our electricity on site is not inflated so it is not a shocker.
5) When the caravan is left unused during winter time, is it ok to leave cold inside or should low heating be on?During the winter months, when the van is not used, a drain down is done. This involves blowing out all the water in all the pipes in the van (not the heating system if you have central heating, this will have antifreeze in it). So if it get's really cold there is no water present to expand and bust a pipe. This is also usually mandated by your insurance. All the water in ubends and toilet bowls will also need a good dose of antifreeze to prevent them freezing over.
Also depending on what part of the country you are in it could be advisable to do it every time you leave the van dormant. It's a pretty straightforward procedure, and once you get the knack will take about 45mins to an hour. Gerry who runs this site sells the hosepipe adapter that is needed to do it or you can grab them off of ebay for about a tenner. Then you just need a car pump to blow the air out. If you don't fancy that then most sites will do it for you for a fee. Ours is £75 I think.
6) I know all static sites have different annual fees etc, but are there any hidden costs to watch out for which may not be obvious?For my site there were no hidden costs really. I get my leccy and gas bill, and site fee. Have to sort my own insurance. Not found out anything else other than that. I'm sure others may have different experiences.
I hope that helps. Ask away if you have any further questions.
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