Financing a Package Home Self Build Project – What Are the Options?
Discover how the package home route delivers clarity on project costs, faster build speeds and greater confidence when creating a bespoke home
by Build It
17th April 2026
Building a bespoke home will always involve some degree of complexity. Multiple trades, the volume of decisions and sheer scale of a house project can quickly make cost control and scheduling feel daunting. For many self builders, the appeal of a package home lies in its ability to bring structure and clarity to that process – fixing more of the unknowns earlier and allowing decisions to be made with confidence.
Package routes are built around defined scopes of work, agreed upfront, and are particularly well suited to offsite-manufactured construction systems such as timber frame, SIPs and oak frame. By resolving design, engineering and manufacture before work begins on site, suppliers can offer greater certainty on both cost and programme – without compromising the individuality of the finished home.
How much you can afford to spend on your package self build?
Before you can move ahead with a project – and ideally before you’ve purchased the land – you need to figure out just how much you can afford to spend. This is fundamentally an exercise in totting up your savings, whatever equity you have in any existing property and what level of funding you could attain via a self build mortgage (if required) – keep reading for more on this.
The sum you come up with will need to pay for your entire project – including the plot, site prep and service costs, construction, professional fees etc. Land prices vary hugely, but tend to work out at anything between 30% and 50% of the total spend.
The remainder will be what you can put into enabling and completing the work. It’s important to have a clear limit in mind when offering on a plot – there’s nothing worse than overpaying and finding you don’t have enough left to achieve the quality you want.
Working in collaboration with Adrian James Architects, Timber Innovations crafted this striking, modern family home in Oxford. he dynamic sculptural form is clad in stylish copper, offering a delightful, durable finish, which is also both 100% recycled and 100% recyclable
Unless you’re in a position of having a design already mapped out for the site, gauging whether you’ve got enough to build with is usually back-of-an-envelope stuff. As a ballpark guide, you can take a fairly standard per m² rate and multiply that by the size of house you want to build.
You should also be sure to retain 10% of your build budget as a contingency, to cover any problems you might encounter over the course of the project. Working with a package company can help to minimise issues during the main construction phase, but you might still encounter a few pitfalls that need to be covered off.
How can a package self build allow you to fix your budget early on?
One of the clearest advantages of the package approach is the ability to establish firm pricing early on – whether that be for the structural kit, an assembled weathertight shell or right up to a full turnkey service. Because package suppliers require a higher level of design resolution upfront, costs are based on detailed information rather than assumptions. “The benefit of doing a timber frame or a package build home is that we produce full detailed plans and manufacture the houses in our own factory,” says Derek Dawson, managing director at Scandia-Hus. “So, we can guarantee the cost of the structural frame and the erection, eliminating a lot of the unknowns.”
This stunning project by English Brothers combines the benefits of modern timber frame with the natural beauty of a glazed oak frame gable end for an eye-catching feature
This clarity is reinforced by clearly defined scopes of work and responsibilities. Structural packages or turnkey contracts set out exactly what is included – from design development and engineering through to manufacture, delivery and erection. That transparency makes budgeting, cashflow planning and discussions with lenders far more straightforward.
It’s also why suppliers stress the importance of moving beyond planning drawings if you want a clear steer on costs. “If people want an accurate, virtually fixed price, we have an in-house design service so they can commission us to do the Building Regulations drawings and go through the specification in detail,” says Derek Dawson. “Once that’s done, and we know the build route, we can give clients a very precise quote – unless they change something.”
Digging out the foundations is an exciting moment on any build but it’s also one of the most nervy – as you can never be completely sure what lies beneath, even if trial pits are dug and soil tests carried out. If site conditions dictate you can’t use conventional strip or trenchfill options, you may need to shell out £1,000s extra for an engineered solution – it’s a setback, but not insurmountable if you’re prepared.
Arranging services
Always try to secure a quote from the relevant utility networks for connecting to gas, electricity etc before you buy a site. It’s not unheard of to faces fees in the £10,000s to get hooked up, especially on virgin plots, and this should be reflected in your offer for the land.
Planning contributions
Currently, self builders are exempted from the Community Infrastructure Levy (provided the project will be your main residence and you live in it for over three years) and from Section 106 affordable housing contributions. However, you must submit the correct forms at the correct time to claim these exemptions. Councils can exercise their right to charge if you fail to do so; and this will be expensive.
Planning conditions
You may be required to submit certain parts of your scheme for explicit approval as part of your planning consent. Common elements include the exact facing brick or cladding, roof tiles and even landscaping schemes – and in some cases, you might end up paying more than you’d originally hoped in order to comply.
Making changes
If you want to stay on schedule and on budget, then changing design details halfway through the build isn’t likely to help. This can also be particularly tricky if you’re using a prefab route, where the building system has been precision-engineered to suit your design. But ultimately, this is your chance to create a dream home, so if you do need to alter something and are happy to accept the added cost that will come with it, don’t be afraid to make the call.
Understanding the build schedule & when the works will take place
Choosing the package home route also brings significant programme advantages, particularly during the early stages of the construction cycle. Offsite manufacture allows several processes to run in parallel. For instance, site preparation can take place while the building components are being engineered and fabricated in the factory.
“The package home route consolidates multiple aspects of the build into one cohesive process,” says Derek McIntyre, SIPs director at JML SIPs. “By choosing a company that handles design, production and assembly, you reduce the risk of delays caused by coordinating multiple trades.”
This sensitively-designed home in the Scottish Highlands featured a complex design, with three floor levels and eight roof areas within the single-storey layout. The remote location also meant no mechanical assistance was possible, so JML SIPs engineered the pre-cut panelised structure for delivery on a small trailer and manual handling on site – efficiently assembling the kit in a snowy, windy January
Once on site, speed is one of the most tangible benefits. “A timber package home project offers an efficient, time-effective alternative to site-based methods,” says Jay Hubbard, managing director at English Brothers. “Factory-manufactured systems reduce on-site construction time and mean follow-on trades can commence sooner.”
Your supplier will be able to give you a firm idea of how long their package of works will take to complete. “It might take as little as a week to erect the watertight structure for a small bungalow, for instance,” says Derek Dawson. “On an average-sized property it may be two to three weeks, and perhaps four or five weeks for bigger or more complex designs.”
Crucially, in each case this will be far quicker than a traditional site-based construction method (such as brick and block). The precision-engineered system is a key part of that, while weather resilience is another benefit. “Timber frame or SIPs projects can continue in 0°C weather or below,” says Jay. High winds are more of an issue, as it will put cranes out of action – but wind is a challenge for any build, and might cost you a week at most. And of course, once the kit’s erected, the works can continue inside and out in a controlled environment.
Case study Build It Award-winning timber package home
Len and Yvonne Rose had no intention of taking on a self build until 2021, when a fire broke out in their West Sussex thatched cottage and destroyed it. “We had nothing but the clothes we were wearing. We had to move into our daughter’s bungalow next door,” says Yvonne. “But we’re in our 80s and couldn’t dwell on what happened. We had to decide – sell the land and buy another house or rebuild on the same plot.” Not keen on trying to find a new location to live in, the couple decided to stay put on the plot that had accommodated their home for more than 20 years.
Photo: Fourwalls
The couple decided that using a timber frame company, where the kit is prefabricated in a factory, would be the quickest way to progress the project. Len and Yvonne were instantly drawn to Scandia-Hus’s chalet-style Cranbrook house and went to visit the company to find out more.
Photo: Fourwalls
“We really liked the front gable that created a double-height hallway with a galleried landing,” says Yvonne. “I loved the balcony and the downstairs snug next to the cloakroom, which could become a bedroom later on – the design felt right for us.” The stunning home won the coveted, reader-voted Best Self Build Project at the 2025 Build It Awards.
Why is the package home route so attractive when it comes to trust & certainty?
Ultimately, cost and programme certainty reinforce each other. Faster, more predictable build stages reduce preliminaries, hire costs and delays between trades. “Offsite-manufactured homes fix the price and timescale from the outset,” says Nick Blunt, UK designer at WeberHaus. “You gain the benefit of a fixed price and programme, with all trades included for the agreed package of works.” For many self builders, that confidence is the real value of the package home route: don’t think of it as a shortcut, but rather a structured way to turn your vision for an individual design into a well-managed, predictable build.
This low-energy, barn-style home sits in a magical forest-edge setting. With a modern oak frame by Oakwrights, the home maximises its views over the spectacular meadows. Photo: Richard Keily
The package route simplifies sequencing and coordination. A shell build, for instance, typically follows three main stages: technical design and engineering, factory manufacture, then on-site assembly. Additional services may include planning support, Building Regulations approval, follow-on materials and, at the upper end, full turnkey delivery.
“The package approach consolidates multiple aspects of the build into one cohesive process, reducing the risk that things fall between different consultants or contractors,” says Derek McIntyre. This reduces the risk of late-stage changes – a common cause of programme slippage on traditional builds. Working with one supplier also means a single point of accountability. That’s hugely valuable for self builders who want confidence the programme for that chunk of works is being actively managed by a specialist.
What can a package home supplier not control when it comes to costs?
Package suppliers are clear that not every element of a build is within their control. Groundworks, service connections and unforeseen site conditions can all affect progress and costs. “Occasionally groundworks can be delayed due to excess rain or unexpected soil conditions,” says Jay. “Issues like this sometimes require intervention from a structural engineer.”
Katy and Alan Pateman teamed up with Welsh Oak Frame to design and build this charming cottage-style oak frame home in the Essex countryside. The 168m² build cost a total of £460,000 (£2,738 per m²), and took a total of 12 months to complete. Photo: Nikhilesh Haval
The value of the package route lies not in eliminating all risk, but in significantly reducing uncertainty during the most complex stages of the build. Good briefing, realistic contingencies and early decision-making remain essential. In terms of paying for your project, different companies have slightly different requirements – but on a shell build, they might expect 40% to enable manufacture, 40% ahead of delivery and the remainder on sign-off of the watertight structure.
“It’s important to agree a payment schedule that works for all parties,” says David Himmons, director at Timber Innovations. “Stage payments at key milestones are standard practice, and vesting agreements are often used to transfer ownership of the kit once it’s paid for.”
Can you use a self build mortgage to finance a package home project?
If you’re considering using a mortgage to fund your package home project, it’s good to know that lenders are often in favour of this route due to the reduced risk and guaranteed project timescales. “Package home projects supported by a detailed build contract, a credible manufacturer or provider, and a realistic overall budget tend to perform well with lenders because costs are easier to evidence, monitor and control,” says Tom McSherry, national business development manager at BuildStore Mortgage Services.
“Stage payment mortgages are often used where costs are incurred at key points, such as manufacture, delivery and on-site assembly,” says Tom. “Where manufacturers require deposits or upfront payments, BuildStore’s exclusive advance payment mortgages can provide vital flexibility. This ensures cashflow constraints do not hinder progress and that contractual obligations to the manufacturer can be met without unnecessary delay.”
What key factors will determine the price of my package home?
The complexity of your design, such as large open-plan living areas and features like differing roof lines, will have a big impact on costs. Then there are optional add-ons such as incorporating energy efficiency upgrades. The location will determine labour prices, while your own participation will also be a factor – if you’ve selected a shell build, self-managing the follow-on works could offer savings, whereas instructing a main contractor might cost more. Ultimately, adaptability is at the core of what your chosen package company can provide. You’ll have the ability to work to a set timescale, with the benefit of cost and scheduling certainty, which will deliver great value for your bespoke home building project.
Answered by Richard Goman
Richard Goman is project manager at Scandia-Hus, a Build It Award-winning timber frame package home supplier
What are the energy performance benefits of an offsite package?
With systems such as timber frame, huge amounts of the construction work are done in a factory environment, using some of the best modern machinery and processes. So, the thermal properties and U-values of your timber home can reach the highest efficiency standards and achieve accreditations such as Passivhaus. Fitting the insulation in the factory guarantees a high-performance envelope and allows you to specify the rest of your project with confidence. You’ll be able to maximise passive heat sources, such as solar gain and mechanical ventilation and heat recovery (MVHR), and benefit from tech such as heat pumps to deliver lower heating bills all year round. Some companies can also deliver the insulated foundations as part of the package.
Answered by Lee Broomhall
Lee Broomhall is sales director at MBC Timber Frame. MBC designs, manufactures and delivers high-performance timber frame structural systems for self builders across the UK.
Are there any hidden costs that I need to be aware of when budgeting for a package home build?
“The biggest advantage when building a brand new house with a structural insulated panels (SIPs) system and/or timber frame package is the speed of delivery and erection. However, having the follow-on trades organised is essential to reduce unexpected costs and time on site,” says Stuart Speight from Glosford SIPs. “Once the SIPs or timber frame are installed and we leave the building site, windows and roof parts can be fitted straight away, saving time, while the internal trades can start work directly after fenestration. This is important to remember as leaving these important elements right to the last minute could cause unexpected costs and delays to you moving in,” he says.
Can I reclaim VAT on a timber frame package self build?
Yes, in the UK you may reclaim VAT on eligible building materials and services – including package builds – through the VAT Refund Scheme for DIY Housebuilders, provided this is a new home. VAT Notice 431NB is the scheme that covers VAT reclaims on UK self builds. Note that most labour costs are already zero-rated, so they’re not part of the process.
Additionally, items such as furniture, appliances and tool hire are excluded from the scheme. You only have one opportunity to submit a claim, which must be made within three months of receiving the completion certificate. The reward for keeping meticulous records throughout the project is a welcome cash bonus that’s the cherry on top of moving into your new home.
Answered by Sarah Mathieson
Sarah Mathieson is managing director at Fleming Homes, a bespoke timber frame design and build company based in Berwickshire.
How much design flexibility is there when constructing a timber package home?
Timber frame construction offers unbeatable design freedom to suit different budgets and meet the requirements of even the trickiest building plots. With a wide range of innovative products and cladding solutions, modern timber frame systems deliver warm, cosy and beautiful buildings, allowing self builders to realise their dream home however simple or elaborate their plans may be. Early involvement is key to a successful scheme that matches up with your budget – get in touch with your structural supplier as early on in your project as possible. They can assist with design challenges and work with your architect to turn your dream into a reality.
Answered by Simon Orrells
Simon Orrells is the managing director of Frame Technologies, and has over two decades’ experience in self build timber frame construction. Frame Technologies offers a flexible range of timber services to cover full supply-and-erect, or supply-only packages.
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