Hi Vineet
Welcome to the forums
you will find a wealth of info here, take time to search through the threads and gain plenty from the experience of others.
I've sent you a direct message in response to your email. Suffice to say, you can ask whatever you want but take the response with a pinch of salt. We met our "builder" 3 times - twice with the award winning site manager Richard Crawford and then had a tour of the build with the assistant site manager David Barker, who's no longer on the development. We asked loads of questions and were advised that we were the first buyers to come to a 'meet the builder' appointment with a printed list of questions and several of the questions had never been asked before. We got the distinct impression that the "meet the builder" is a tick box exercise to make the customers feel valued - ultimately our aim was to find out about the site manager's confidence in the build schedule, his teams quality standards and his view on customer care. He said "quality is my top priority, I'm not happy until you are 100% satisfied with your home" - several weeks later he told us that we only needed one day of touching up to be done when we completed - 28 days of work and still counting and having now dealt directly with 13 different sub-contracting companies....it tells a very different story.
If you get a good site manager, with a well-resourced and stable team, with a contracts manager that cares about quality you are probably onto a good start - perhaps you could ask how many are in their team, how long they've been on the development, what the staff turnover is like, what sorts of problems have arisen to date and what actions has the site manager taken to rectify them. Taylor Wimpey do not stipulate that their site teams are experienced builders, and as we have found, with the assistant site managers, they are not all that knowledgeable when it comes to the intricacies of your new home - if they start to squirm at your questions, hesitate to answer or you get any sense they are overly confident, take your money and walk away - if they confidently recount several issues that have been resolved - dig a little deeper and ask who else you can speak to, which residents can you approach to ask about their experiences.....Treat it like a job interview - you are handing over a shed load of cash for this person to project manage the build of your new home and to date you probably know absolutely nothing about them apart from the name of their employer. Forget the nice cosy sales team, it is the site manager that determines how good your house will be - get his mobile number and email address, send him lots of questions about construction methods, frequency of inspections, their relationship with the NHBC inspector, what other sites they've managed, how long they've been in the business, how long they've been with Taylor Wimpey etc etc. Be sure to ask if it is them who will be overseeing / inspecting your plot - it often won't be! So get the name of the assistant who will be and their contact details.
Is there a residents Facebook page or a community group that you can get in touch with to confirm anything the site manager tells you. Alternatively ask the sales team to pass on your details to new residents who have just moved in and others who have been in for a few weeks (this should minimise their chances of cherry picking who they ask) to ask if they'd be happy for you to contact them and get the sales team to get back to you - make them work harder for their bonus. You could always hang about the sales office on a saturday morning, if there are already a few residents on the estate, chances are they'll be in and out of the sales office over the weekend.
Make sure you get some "sit down" time with the site manager and that it's not all looking around a building site - take notes of the answers they give you and ask if you can make further appointments with them if you decide to go through with the purchase. Take photographs of everything, the site, the build, pipework, drains, timbers, brickwork etc etc.
Above all else, remember that you have not committed in full until you have completed - the site manager's bonus will be affected by your purchase so don't be afraid to remind him that you need to be convinced that he is going to treat the build of your house like it was his own. You may also wish to tell them that you are aware of several issues at nearby Taylor Wimpey sites and what assurances will they give you that you won't have similar experiences....write down their answer
Good luck