Are you actually for real? This is massively entitled of you - and the OP's neighbours are similarly entitled - not to mention that I don't think you understand how the costs stack up here. OP didn't say she was spending 30K to live elsewhere while work went on in her house, she said that if they delayed for 3 or so weeks it might cost them 30K, which as I understood it includes their own rent for wherever they're living, but also the builder's costs for deferring the work.
Also, I'm not sure it makes one whit of difference if your DD is studying hard to get her 3 A*s for a Cambridge place, or if she's going to struggle in order to get 3 Cs for some less prestigious institution. Or do you think that the less able should put up with noise but someone aimed at Oxford or Cambridge should naturally be accorded more consideration? What a crappy attitude, if so. 
I think, personally, that the offer made of a nice-sounding office for the young woman to work in, and clearly a lot of apologetic communication from the OP, is a hell of a lot more than many people would make. My own son's going through his A Levels at the moment and if our neighbours had booked in noisy, protracted building work, I think yes, I would quietly hate them, but building work starts at 8 and finishes by 4 (ha, if you're lucky - our recent builders buggered off by about 3!) and most A level students can work at their school/college every day, and if not there, then at a local library, coming home after the work has finished. Nobody is going to have their sleep interrupted by angle grinders FFS.