Would-be house buyers who are struggling to find properties in the borough are having their
misery compounded by Hillingdon Council's failure to ease the complicated process.
LMS, a mortgage strategy website which provides services such as Home Information
Packs, conveyancing, and valuations has revealed that Hillingdon is the slowest at compiling data for prospective buyers.
Figures show it takes an average of 17.33 days to respond to requests, 10 days slower than the national average.
On one occasion in June, the council took an astonishing 44 days - nearly nine weeks - to respond to a request.
Dominic Toller, director of marketing and new business at LMS, said: "The longer a search turnaround time is, the more chance there is for a house sale to fall through."
The best ranked, Crawley Council, took an average of just three and a half days to compile required information - five times quicker than Hillingdon.
Jean Palmer, director of planning and community services at Hillingdon Council, said: "Although changes in the services have meant that there have been some delays in processing searches, currently a search of the local land charges register takes 14 days.
"If additional questions are asked through solicitors these searches can take up to 28 days, but data provided to personal search agents are completed within 10-11 days.
"Officers are currently investigating ways to make the service more efficient."