UPDATE 2-FTSE 100 hits lowest since May on no-deal Brexit fears, Wall St slide

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* Homebuilders fall as regulator suspects malpractice

* Utilities, healthcare, consumer goods stocks lead declines

* Tech selloff hits Wall Street for second straight day

* FTSE 100 down 0.9%, FTSE 250 off 0.6% (Updates prices to close, adds comments)

By Shashank Nayar

Sept 4 (Reuters) - The FTSE 100 fell to a near four-month low on Friday as the chance of Britain leaving the European Union without a trade deal rose sharply, while housebuilders tumbled amid scrutiny from the UK's competition regulator.

The blue-chip FTSE 100 .FTSE fell 0.9% on the day to post its third straight weekly decline, with healthcare, consumer goods and industrial stocks among the biggest drags in the index. The mid-cap FTSE 250 .FTMC closed down 0.6%.

Brexit negotiations have been threatened by London's insistence that it has full autonomy over its state aid plans, negotiators and diplomats said, and fears are mounting that an exit without a trade deal could sow yet more economic chaos amid the COVID-19 crisis. remains a fragile backdrop with mixed economic data, concerns about rising unemployment and no sign yet of a coronavirus vaccine, meaning that the slightest bit of bad news could be enough to cause further volatility in markets," said Russ Mould, investment director at AJ Bell.

UK stock markets have rallied since a coronavirus-driven crash in March, but had so far lagged their U.S. peers, which were scaling record highs on the back of historic stimulus and a jump in heavyweight tech stocks.

But U.S. benchmarks have fallen sharply since Thursday, with the tech-heavy Nasdaq .IXIC shedding as much as 5% for a second straight day, sparking a flight from global equities. .N

"The selloff was both overdue, after the market has been unidirectional higher for months, and likely a blueprint of the kind of volatility we will see as we work our way into the fall," said Art Hogan, chief market strategist at National Securities.

In the UK, data showed the momentum behind a rebound in the construction industry faded unexpectedly in August, while new car registrations fell by 6% in annual terms - a "disappointing" turnaround after July's increase. Barratt Developments BDEV.L , Persimmon Plc PSN.L , Taylor Wimpey TW.L and Countryside Properties CSPC.L fell between 4.5% and 7% after the Competition and Markets Authority said it was investigating whether they might have broken a consumer protection law in relation to leasehold homes.