You are being handed over your newly constructed house. Who will you blame for the poor quality of construction?

One shouldn't get to this point.  As this is not an ideal world - one can minimise impacts.

I would ensure that my specifications are understood and clearly expressed to the team.  Off-course this will be documented and individuals will sign-off to say they understood

Not just leave site visits (if geographically possible) to the construction team.  I will go around to check progress myself or send a trusted party to give feedback.  Take with me a family member with engineering/construction knowledge.

Over here - one can employ the progress payment policy to ensure you pay what you've been quoted for, but also ensures the builder they are covered as well and not suffer losses when someone cannot pay.

First of all, having poor quality impacts all, and it's a loss for both the customer and supplier (whether design company, prime contractor, or sub-contractors), we need to study the root cause for that delay, and from that we can know if the error has been in the design, planning, or execution. However, I would advise spending more time in finding mitigating solutions to get back on track, as the customer would be the biggest loser in further delays.

Consultant

Well to begin this could be discussed on many levels right from the conception of the drawing to the hand over of the Keys. is the poor quality in regard to the materials? workmanship? turnover time? if the EXACT expectations are not delivered on all levels there will be sub standard workmanship in everything from plumbing to electrical to ease of maintanence years down the road. from my expierence it can take as little as half of one working day to create a weeks worth of extra work. which also relates to poor quality along with delays in delivery. In the end its everyones responsability to ensure that quality and safety must prevail. when people begin the "Blame Game" its usually because of a lack of follow up on thier own part. It you want it done right do it yourself, or least be confident in those you bring on board.

The consultant, because he is the one responsible for supervision and quality assurance. However, in most of the standard construction contracts, the contractor isn't relieved from responsibility of major defects in the works even if at certain stage was approved by the consultant and later on defects appeard.  

Somewhere all are responsible, but it also depends whom you are liaising dirctly because1st point of contact is always the influncer of your decision. in most of cases consultant but responsibilites of contractor and developer are equally important.

A proper decision should be made after a thorough investigation from our side.

ans is B

It depends at which time you have finalized the deal and at what time you have realized the defects in construction.

If you just realize it after taking the possession, then it was not a fair deal by your developer, who has actually failed in providing you the comfort level about your investment.

It is a very generic question and cannot be answered with the given information. 

All

Developer with poor spec. , condition ..

Contractor with poor labour , material , tools , ..

Consaltant with poor instruction, bad receiving ( should reject the bad one ) ..

I will balme myself either for improper briefing or for inadequate control over quality.