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If there was an award for Britain鈥檚 craziest project, this west London house would be at the top of the shortlist. It鈥檚 a four-bedroom home with a nanny flat, generously proportioned living space and three patios 鈥� so far, so estate agent鈥檚 blurb. But all are shoehorned into a garden behind a house in upmarket Gloucester Road.

The house鈥檚 wealthy and powerful neighbours were determined that nothing was going to be built on the 460m2 site but, after two planning applications and two appeals, permission was finally wrung out of the Royal Borough of Kensington and Chelsea. Just to give you an idea of how many people were involved, 20 party-wall agreements were needed before work could start.

Obtaining planning permission was only the first hurdle, however. Because the house is in a garden behind a terrace of shops with flats above, the only way in was through the communal hallway of the property fronting Gloucester Road 鈥� which was divided into flats and occupied by some of the residents bitterly opposed to the whole project.

Assuming the builders could get past the angry neighbours, the only way into the garden was through a standard-sized doorway. And this house is no lightweight; it has a substantial basement, heavily reinforced concrete retaining walls and slab plus a steel frame. Not the sort of materials that can be easily carried through a doorway.

Predictably, the neighbours weren鈥檛 going to take their planning defeat lying down. They put all their energies into making life as difficult as possible for the contractor. Yet despite these multiple obstacles, the multimillion house is due to be finished any day now. How has the project team managed to deliver this seemingly impossible scheme? And more to the point, do you have to be mad to take on a project like this?

In fact the client, developer Ivo Hesmondhalgh, comes across as perfectly calm and sane. When he first saw the site, it was occupied by a large, derelict shed so getting planning permission to build what he intended to be his dream home wasn鈥檛 totally beyond the bounds of possibility. 鈥淚 really like architecture and wanted a modern house,鈥� he says. 鈥淚 wasn鈥檛 confident because it was so complicated but I knew I had the right people to help me and the rewards for doing it outweighed the problems. I also knew it was a once-in-a-lifetime opportunity.鈥�

In 2001 Hesmondhalgh took a massive gamble by buying the plot without residential planning permission. He then set about finding an architect and getting permission for a change of use from business to residential. He got that 鈥渞elatively easily鈥� in 2002. He then held a private design competition, which was won by Studio Bednarski.

This is where the problems began. The Studio Bednarski proposal was no bigger than the existing building except for the addition of a basement to increase the internal volume of the home. 鈥淭he new building was entirely in the envelope of the old building and would be better to look at than the junk that was already there,鈥� says Cezary Bednarski, the practice鈥檚 founder.

He says he conceived the design as a lightweight object to lessen its impact. 鈥淲e had to be clever so we created a Japanese-type garden pavilion, not a house, which is a heavy, defensive object,鈥� he says.

There was another important aspect to Bednarski鈥檚 design: 鈥淭he whole building was conceived so it could be built through that passageway.鈥� Unfortunately, the neighbours weren鈥檛 impressed. 鈥淲e had neighbours who were very powerful including, I believe, the top commercial lawyer in the UK,鈥� says Bednarski. 鈥淭hey decided they would not have it. The council was aware of their opinions and was very wary of giving in.鈥�

Indeed the council refused the first application, saying the design was inappropriate for its location. Hesmondhalgh appealed, but lost on the grounds that trees in the neighbouring Launceston place would be damaged. Bednarski was delighted, however, because the appeal inspector was complimentary about his design. 鈥淲e thought this was brilliant as all we had to do was prove the trees wouldn鈥檛 be affected,鈥� he says.

But Kensington and Chelsea planners took no notice of the inspector鈥檚 comments and refused the second application on design grounds again. Hesmondhalgh appealed this second decision and, this time, in March 2004, he won. The planning process had taken nearly two-and-a-half years.

Meanwhile Hesmondhalgh asked the contractor, Diamond Construction (2000), a firm he has worked with for the past 20 years, to do some initial investigations of the site. According to Sam Samra, the firm鈥檚 director, the limited access through the hallway meant things got off to a bad start. 鈥淲e started getting complaints from the neighbours. The lads made a mess of the carpet just doing the initial works,鈥� he says.

In fact, Samra reckons the contractor couldn鈥檛 have done the job without an unexpected stroke of luck. In the wake of the muddy carpet incident, a meeting with the residents of the building on Gloucester Road about conditions for access didn鈥檛 go well. 鈥淭here were a lot of conditions being set for that passage,鈥� says Samra. 鈥淭here was no way we could have done it. There would have been a lot of complaints and we would have ended up abandoning the job.鈥�

But the project team got a lucky break in the form of an empty post office. It is located in Victoria Grove, which is perpendicular to Gloucester Road, and backs on to the side of the site. By chance, Hesmondhalgh heard from an estate agent he knew that it was being vacated and did a deal to take it over for a year-and-a-half. This meant access was much easier as the team had a front door to the street free from irate neighbours. 鈥淚t was a relief for everyone,鈥� says Samra.

In August 2005 Diamond could finally start work. The post office had saved the job or, at any rate, had taken it from virtually impossible to extremely challenging. 鈥淲e took out half the shopfront and the back wall of the shop,鈥� says Samra. 鈥淭hen, when we got this sorted out, we had more problems as the council鈥檚 highways department wouldn鈥檛 let us leave anything in the road because it was too narrow.鈥�

The council wouldn鈥檛 allow a skip but gave permission for a lorry to be parked in the road for an hour at a time. Waste from the excavation would be carried from the site into the shop and stored at the front ready for collection. A lorry equipped with a grab bucket was used to remove the waste 鈥� 126 lorry loads of spoil were dispatched this way. The team could only unload and load in the mornings 鈥� a decision made to placate a flower shop owner across the road whose initial reaction to the arrival of the lorries was: 鈥淎llah will kill you.鈥�

鈥淚 went across to explain what we were doing and we weren鈥檛 deliberately trying to cause problems,鈥� says Samra. 鈥淪he said, 鈥業 open my shop at 1pm鈥�, so we said we would only have deliveries before 1pm.鈥�

Creating the basement was one of the most demanding parts of the job. Diamond could only get a mini-excavator into the site and a small dumper truck to move material from the workface to the back of the shop. They had to dig out a 4m deep hole to create the basement and ensure none of the 13 neighbouring properties fell into it. Four properties on Victoria Grove had to be underpinned as the excavation was up to 3m below their foundations. The work was agonisingly slow, and took a month in all. 鈥淲e had to be really careful with the digger and do quite a lot of it by hand,鈥� says Samra. A retaining wall was built around the perimeter of the rest of the site.

By now, the neighbours鈥� complaints had started to focus on noise. Water started pouring into the excavated basement, 鈥渓ike a stream鈥�, according to contracts manager Raj Kaler. This called for a dewatering pump, which was meant to be switched off at night. Inevitably someone forgot to turn it off. 鈥淭his woman rang me in the middle of the night saying she could hear a noise which was the water pump,鈥� says Kaler. 鈥淚 said I was really sorry and it wouldn鈥檛 happen again. I gave her a box of chocolates and she was okay after that.鈥�

Diamond even fitted secondary glazing to the windows of a relocation specialist, whose office was closest to the site. 鈥淲e helped in any way we could, to show our respect to the neighbourhood,鈥� says Samra.

Once the retaining wall had been built and mini-piles had been sunk, work moved on to constructing the foundation slab. This consisted of ground beams spanning between the mini-piles, topped by the slab. The floor beams were 600mm2 in section and the floor slab sitting on top was 300mm thick, which equals lots of concrete.

The access problems meant concrete had to be mixed onsite. The cement arrived in small bags 鈥� 720 on each load 鈥� which were dropped on to the pavement and carried through to the back of the shop. Concrete was mixed in a domestic-sized mixer and placed as needed. The main slab was cast in sections with each section placed in one day.

Up to 25 people were needed to mix and place the concrete. 鈥淲e had to pull everyone off other jobs so we could do the sections in one go. It was about 85% labour,鈥� says Paul Samra, Sam鈥檚 brother and the construction manager on the site. 鈥淚 was mixing concrete in my sleep,鈥� laughs Kaler.

As work progressed on the slab towards the west side of the site, steel erection could begin on the completed east end. 鈥淭he steel was pretty straightforward except we only had hoists or, in many cases, sheer manpower,鈥� says Paul Samra.

But reaching this stage of the project meant the final size of the building was revealed. More complaints started rolling in to the council planning department. 鈥淓very time the planning enforcement officer came down, it was fine,鈥� says Paul Samra. 鈥淭he overall height was spot on and it was 15mm wider than the drawings, which the planning officer wasn鈥檛 bothered about. I had kept double-checking as I went along.鈥�

With the steel completed, work could move on to the internal stud walling and the roof. Unfortunately, at this point 鈥� November 2006 鈥� the weather changed. 鈥淲hile we were doing the steel, it was glorious sunny weather,鈥� says Paul Samra. 鈥淎s soon as we started on the timber, the heavens opened.鈥�

The bad weather has delayed the project but fortunately the post office owner has agreed to extend the lease. Drilling holes in the steel for timber connections proved hugely time-consuming. It took eight people three months to do the timber works.

The roof and north side of the building have been clad in copper, and a hardwood-framed glazed wall has been inserted on the south side to get as much light as possible into the building. Initially, the glazed areas were supplied as complete units but Diamond quickly switched to building these insitu as the units were too heavy to manhandle.

The hard work is over and decorating is due to start soon, with Hesmondhalgh moving in towards the end of summer. Let鈥檚 just hope he gets on with his neighbours.