Is this a bad time to build an extension?

Material costs will always fluctuate depending on supply and demand, some have gone back down in price some have continued to rise. No time is a bad time to build an extension, if your need/want for an extension is high and you will benefit from it then go for it. Good luck and I hope it all goes smoothly

yes material costs are high at the moment, demand is out stripping supply on some products with limits on certain items also. its like anything as soon as demand eases you will probably be able to get better prices with a bit of negotiation.But will waiting to save a few quid be better than having the space you need now.

There are no right or wrong time as things change so quick.If you want the space I would build as long as it's in your budget

Materials will eventually go down in price who can say when? Due to the pandemic and brexit but building any time will make you money in the long run and a bigger better happier home .👍🏻.