Baker and Sons, whose premises were beside the Thames in Lambeth, were one of the companies to submit a tender for building the new gaol. They were initially unsuccessful: outbid by John Jay, a stonemason based in the City of London.

But by November 1842 Jay was declared bankrupt, having found himself unable to fund his expanding business. The Berkshire justices made contact with Baker once more and this contract for the gaol's construction was signed one month later. It includes clauses enforcing Baker's tender at fixed prices, as well as an agreement by Baker to pay £200 to the County for the scrap value of the fixtures and fittings in the old gaol and governor's house.

Jay was eventually able to repay his creditors and his business recovered: his firm would go on to build the Metropolitan Line, Paddington Station and the Victoria Tower at the House of Lords. Baker and Sons' most notable project was constructing the Natural History Museum.

These printed tender documents were how the County received expressions of interest from firms who wished to build the new gaol. Seven tenders were returned.

The County Surveyor had estimated the costs before the tenders were printed; firms were then invited to express their bid as a percentage reduction against the estimates. Baker and Sons offered an 18% reduction against the County's sums for bricklayers.