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Tuesday, 29 September 2009

Construction Systems: Package Building

Construction Systems: Package Building

As part of H&R's 12 Steps of Self Build, we look at Package Builds and find there's more to choosing a build method than selecting materials and techniques.

Construction Systems: Package Building

ABOVE: Some examples of houses built by package companies. Clockwise from top left: Timber Frame by Baufritz; Timber Frame by Potton; Masonry by Design & Materials; Oak by TJ Crump & Oakwrights.

Central to the decision is the whole question of procurement, or how you get your superstructure delivered. Traditional, in this context, means going with an architect or a designer, allied with the skills of the local building trades. The alternative is to work with a dedicated homebuilding business, or package company. As a rule, these package companies deliver timber framed homes from their own factories, but there are many differences between them and if you are thinking of using one, you have to pay close attention to what it is they are offering.

Not all package-build companies are timber frame. Design & Materials, for example, works mainly with masonry mater - ials. There are some, such as Custom Homes, who offer a choice of build systems (SIPs or timber frame). And there are examples of continental custom home builders who deliver panelised masonry homes.

Scottish Experience

Scotland has the most developed packagebuild industry in the UK. It is based around a very standard product, delivered by a building trade which is fully conversant with it. Most Scottish package builds are based on timber frame, and the companies working in the sector all deliver much the same package, which includes the joinery ready-fitted and the plasterboard. This makes it much easier to compare quotations.

In contrast, package-build companies in the rest of the UK, and from the continent, work to very different standards and provide very different levels of service. Some are supplying nothing more than the superstructure, others offer to supply many additional items such as joinery and wall finishes, whilst many of the continental suppliers are keen to deliver every single item making up the finished house.

Even the measuring systems vary. Bear in mind that the unofficial UK method of measuring house size is to use the internal or net floor area, whereas most German and Swedish companies use the gross area, which includes the width of the external walls. So a 160m2 house measured the British way could well be said to be 180m2 using the continental system.

FACTORY BUILDS

Timber Frame House by Baufritz

There are a number of companies who can provide a full turnkey service, building virtually the whole house in a factory, not just the superstructure as happens with conventional timber frame. This solution is commonplace on the continent: the houses are usually timber frame but there are also masonry versions as well. This particular timber frame house is from German package company Baufritz. Read more about it here

Monday, 28 September 2009

SIPs Self Build - £1300 / sq metre = £124 / sq foot

http://www.homebuilding.co.uk/your-projects/sips-self-build

A SIPs Self Build

Beccy and Steve Kestin’s unique energy-efficient home was built using Structural Insulated Panels (SIPs) – chosen for their fast construction time and airtightness – ensuring the property is superbly insulated, despite its extensive use of glazing.

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A SIPs Self Build

Fact file

Name Beccy and Steve Kestin
Profession Mussel farmers
House Type Four bedroom detached house
House Size 270 sq m
Finance Private
Build Time Jan '06 - March '07
Land Cost £305000
Build Cost £360000
Total Cost £665000
Current Value £850000
Cost /m2 £1333
Cost Saving 22 %
Build route Builder and specialist subcontractors
Construction system Structural insulated panles (SIPs), blockwork, zinc roof
Architectural features Conservatory, Flat roof, Glazing, Open plan
County Cornwall
Region South West England

When Beccy and Steve Kestin decided to start a new life in Cornwall they took on two immense challenges. The first was to start up a mussel farm – Cornish Mussels – which they now run together, and the second was to build a brand new, eco-friendly home on the site of a bland 1950s bungalow.

Click here to read the full story...

Further reading:


Demolition and site clearance
£1,200
Reinforced slab and footings
£12,800
Scaffolding
£1,000
Floor insulation
£2,100
Structural insulated panels (SIPs)
£59,000
Zinc roof, soffits gutters
£17,879
GRP flat roofs
£800
Velfac corner windows
£13,000
Conservatory and sliding doors
£74,000
External rendering
£17,000
Underfloor heating
£4,000
Plumbing
£8,500
Electrics
£11,500
Plasterboard and plastering
£7,000
Limestone flooring
£17,000
Sanitaryware
£7,500
Kitchen units, appliances and granite
£15,000
Hearth
£700
Heat recovery unit and fittings
£3,500
Staircase
£8,250
Lighting design and supply
£5,000
Central vacuum system
£1,000
Patio
£1,632
Deck
£1,500
Fees
£26,000
Main contractor
£43,000