To think £80k + VAT on an above garage extension is extortionate!

[Glitterlikeawinner]

Just that really, we bought our standard 1930s 3 bed semi 5 years ago for £220k in North West England. We've been considering an above garage extension which is adjoined to our house for a few years and finally go round to the plans. Now we have a quote for £80k plus VAT. The room isn't massive, about 4m x 4m with a small en suite 2m x 2m. We have the foundations already under the garage from a fairly recent garage build.
I was just a bit shocked and equally gutted as we had approval for £50k from the bank which we thought would be enough to cover this. Our architect/structural engineer who drew the plans never gave us an estimate of likely costs despite knowing our budget so I'm a bit peeved that we've gone through this process, paid him more than £4k and now can't afford the job itself!
Was I being totally naive to the cost of extensions, is our builder over pricing or is this the result of covid prices?

We just had an integral garage converted into a bedroom and pantry at a cost of £12 grand. What are you planning doing to your garage? Painting it in gold?!!!

Sorry! Must read all the thread before posting! You want to build a second story extension. That probably is about right. Materials are so expensive. Even with our conversion, materials were 40% more than they were this time last year!

Hi, I'm really surprised at this price but the fantastic builder we used kept telling us how everything was increasing in price. We paid £25000 for an extension above our garage in June 2021, this included plastering but we had to pay heating and plumbing for our extension bring the cost for the shell to £26k

Oh and we're in Yorkshire

@Buildingthefuture I've looked into the estimators online, looks really helpful so think we will do this in the new year. Quick question, is this something we would then share with the builder to ensure like for like quotes or is this more for us to measure against said quotes? Thank you!