Tag: Potton

  • HPH204 : Why you shouldn’t rule out custom building on a developer estate

    HPH204 : Why you shouldn’t rule out custom building on a developer estate

    Five self-builders explain how they came to build their houses on the edge of a developer estate.

     

    All photos of Pip’s house copyright Potton. Photographs taken by Maciek Platek

    Interview with Pip, Yvonne and Martin, Jessica and David

    When Pip decided to move away from Surrey because building plots there were too expensive, and Yvonne and Martin knew that they wouldn’t be able to fulfill their 25 year year self build dream for the same reason in their home town of Buckingham, they found a developer site in Cambridgeshire offering more affordable plots on a street set aside for self builders.

    Jessica and David’s story is a little different. They lived around 5 miles from the site and went to have a look around one day out of interest. Having never previously spoken about building a house, they made an offer that same week and had it accepted.

     

    The land owner provided outline design guides

    The brownfield land was formerly a brickworks before being bought by a company called ONH. A number of developers were building on the site but one street of 13 plots at the outskirts, overlooking fields, had been set aside for self build. The outline guide included that the houses should be eco-friendly and contemporary in design.

    Challenges arose during the construction because, being at the back of the rabbit warren of narrow roads on the new estate, heavy lorries struggled to get past parked residents cars.

     

    The substantial plot sizes influenced the house designs

    David and Jessica

    As David and Jessica bought their plot on the spur of the moment, the design wasn’t something they had given too much consideration. They employed a local builder initially, who then recommended an architect and worked with him to develop their rough ideas into workable plans. They opted for four double bedrooms, two with en-suite, and a family bathroom upstairs. Downstairs they wanted a large kitchen with an open plan family room. Having attended a self build conference which emphasised the importance or airtightness, MVHRs etc, they decided to follow an eco-house route, with triple glazing, solar panels and under floor heating. They also have a large garden with an area used as an allotment.

     

    Yvonne and Martin

    Yvonne and Martin’s is a large plot so they felt they needed to build a substantial sized house, which although they are the only two living there, provides them with plenty of space when their children and their families come to visit. Having been built well with airtightness in mind, they have a comfortable home with low running costs.

    They also wanted to future-proof their home so it would still be accessible when they are in older age. They have four double bedrooms on the first floor, but downstairs has been designed to work as a fully self contained unit. It has a wet room and bedroom on the ground floor and space to install a lift if required.

     

    Pip

    Pip originally wanted a Passivhaus with a traditional exterior, but the council informed them it needed to have a contemporary design. Instead she worked with an architect at Potton who developed their ideas into a design they were blown away by. As the budget was stretched as works progressed they moved away from trying to achieve the Passivhaus standard and using ground source/air source heat pumps, but did manage to retain the solar panels and underfloor heating.

    Establish good relations with your fellow self building neighbours!

    Pip recommends getting to know your new neighbours as early as possible, particularly if you’re joining at the end of the plot sale process, so you can tap into their knowledge and previous experiences.

    Getting your finances in place is something Yvonne advises. The build process can be extremely challenging so ensuring you have sufficient cashflow sorted early on can help to eliminate some of the stress.

    Martin suggests working to develop a good relationship with your builder. His builder asked that if there were any changes or extras that he be notified early on so they could discuss and agree it so it wouldn’t be a problem, and this worked well for them. Martin also recommends thinking about the small things in advance, such as where sockets are going to go.

    Locating the services and getting them installed early on is something they all say is important. Several of the house builders on the site were already starting construction before the water had been connected, leading to lengthy treks to get some from friend’s houses or relying on the kindness of neighbours!

     

    Find out more

    Find out more about Pip’s Potton designed home.

     

    Transcript

    Download a transcript of the interview with Pip, Yvonne and Martin, David and Jessica.

     

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  • HPH124 : A contemporary Passivhaus home, built with SIPs – with Paul Newman from Potton

    HPH124 : A contemporary Passivhaus home, built with SIPs – with Paul Newman from Potton

    Paul Newman from Potton talks through the construction of the UK’s first Passivhaus show home.

     

    Interview with Paul Newman

    Paul Newman is the Self Build Director at Potton. Potton, which recently celebrated their 50th anniversary, have helped design and build over 6000 homes and have a portfolio of over 12,000 different designs. The Potton approach to custom build is to work with landowners to secure outline planning permission on their sites, with design left as a reserved matter. They find customers for those sites who then buy the land from the individual landowners. Potton then work with the customers to provide their normal self build package.

    At their site in St Neots they have a show centre of completed houses, where they are currently adding a Passivhaus. They have been sharing progress of this build with video updates and have also allowed members of the public to experience it being built.

    Potton Passivhaus mock up

     

    Building a Passivhaus show home was an obvious step

    Potton have four complete show homes at their St Neots site and one at the National Self Build and Renovation Centre. Moving with the changing market and increased demand for low energy homes, their last show house was constructed to achieve level 4 of the Code for Sustainable Homes. Wanting to move their business on and offer customers something new, they decided to construct a further show house, with a Passivhaus being the obvious choice.

    Their experience over the last 8 years has been that they’re being asked more and more often about energy efficiency and low energy homes and hope that this Passivhaus and the lessons they have learnt from it will put them in good stead for the future.

     


     

    The design aimed to push the Passivhaus standard hard!

    In coming up with the design Potton were keen to challenge the reputation that Passivhaus buildings sometimes have of being simple, boxy designs. They expect to evolve different design forms based on this Passivhaus, while not necessarily directly repeating it.

    They worked with HTA Design, an external design consultancy, on the plans, and also had specialist help from Passivhaus experts WARM.

    The building form is quite complicated and has a valley roof, so from a thermal bridging perspective the junctions have been tricky to resolve. Paul also thinks their life would have been much easier if they’d taken 18 inches of height off the design!

    Potton Passivhaus cross section

    Something they found encouraging was the use of an innovative self adhesive breathable membrane which has contributed positively to the building’s airtightness. The first airtightness test had a figure of 0.68 but after some alterations they managed to get it down to 0.5.

     

    The SIPs system took a matter of days to install

    The house has been constructed with Kingspan Tek – a product which is certified by the Passivhaus Institute – and Potton have been using it for the last 10 years on both their self build and volume contracting business. It provides a thermally robust solution and can be erected on site very quickly. One consideration, however, is that once installed it is hard to make changes to room layouts, etc.

     


     

    Use PHPP modelling from day one to see how the building is performing

    Paul explains that early modelling in the Passivhaus Planning Package was an important lesson for them when designing the Passivhaus. By doing this, something that showed up early on was that the building had a tendency more than was desirable to overheat. They were able to experiment by changing the overhangs, reveal depths and specification of the performance of the glazed units within the windows to make a considerable difference.

     

    Engage with suppliers early in the process

    There are two main lessons that Paul feels they have learned from the Passivhaus self build process. The first is the need to engage early on with suppliers to make sure they understand what you’re trying to achieve, have the right products available and certifications in place where appropriate. While they did try and engage early with their supply chain, their lesson was that they actually should have engaged even earlier and placed some of their orders earlier too.

    Secondly, Potton worked with sub-contractors who they have used on hundreds of other Potton houses in the past. What they found was more attention to detail was required to achieve Passivhaus performance, and they needed to have their hands held tightly throughout. Paul thinks this is something that won’t be unique to their build, as there just aren’t enough experienced Passivhaus sub-contractors out there.

     

    Find out more

    Visit the Potton website

    Find out more about Potton’s Self Build Academy

    Find out more about Potton’s Self Build Live

    Follow Potton on Twitter

     

     

    Transcript

    Download a transcript of the interview with Paul Newman.

     

    The Hub update

    Our Getting Started module is for absolute beginners who want to know how to research a house build. We’ve laid out a logical route so you can get going.

    In the Long Barrow case study the latest video shows the steel frame going up, and explains the areas where they needed to be careful of thermal bridging as they wanted to attach a balcony and a brise soleil as well.

    Elements of The Hub are free to view, but for full access the price currently is just £45 for the year.

     

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