Understanding the total cost of a transportable home
Because a transportable home is built indoors to a defined specification, a builder can usually give you a firm price for the house itself much earlier than they could on a fully site-built project. That price is strongest when the specification, inclusions, timing, and contract terms are clearly documented.
As a rule of thumb, the house itself often makes up around 75% of the total cost of a transportable home project on a straightforward site, with the remaining 25% covering site-specific costs such as freight, foundations, service connections, consents, and council requirements. That split is a general guide, not a fixed rule, it can shift significantly depending on your site.
What's fixed early, and what isn't
The house price can be firm from very early on, because it doesn't depend on your specific site. The site-specific 25% is different. Any pricing you get for that portion early on, before your site has actually been assessed, should be treated as an estimate, not a final figure. At that stage, nobody yet knows your ground conditions, your services, or your consent situation. Fixing that number properly takes detailed design work, not a guess made before anyone has looked at your site.
Why the site portion is harder to price
The site-specific part of a transportable home build starts with ground conditions. A geotech report tells you what foundation your home will need, standard piles, deeper piles, added bracing, screw piles, or, in softer or unstable ground, rammed piles and that decision affects almost everything else in the project. The same report shapes how septic and stormwater systems get designed: a high water table, for example, can mean a shallower stormwater soakage pit than you'd need on a well-draining site.
From there, a proper site assessment should also check whether the project may trigger resource consent or other planning requirements, for example because of boundary setbacks, site coverage, height, overlays, flood or natural hazard rules, earthworks, servicing constraints, rural zoning, or adding another dwelling to a site. That's worth knowing before a project starts, not partway through it.
What a well-run builder should do
A transportable home builder who wants to give you genuine price certainty, not just a fixed price on the house, needs to resolve that site-specific portion before the final contract is signed, not during the build. In practice, that means:
Getting the geotech report early, since foundation type and site services depend on it.
Scoping site works — septic, stormwater, service connections, against the actual ground conditions, not a general assumption.
Checking for resource consent or planning triggers upfront, so they can be sorted before the build starts rather than causing a delay partway through.
Pricing every one of those items before asking you to sign a final contract, so the number you agree to actually reflects your site.
A builder following that sequence properly should be able to offer a fixed contract price for the agreed scope, rather than only fixing the price of the house itself. The key is making sure the contract clearly states what's included, what's excluded, and what assumptions the price relies on.
What typically sits outside a transportable home contract
Even with a well-run process, a few things typically sit outside the build contract:
Anything outside the agreed scope of works for example, if you're arranging your own contractors for service connections, or building your own deck.
Council development contributions, where applicable. These are calculated under each council's own development contribution policy and can vary by location, project type, and demand on local infrastructure.
Consent fees for placing the home on-site, covering foundations, services, and district plan compliance, usually paid directly by you even where the builder manages the process on your behalf.
Resource consent costs, including surveyors or planners, if your site needs one.
Landscaping, fences, driveways, and gardens are rarely included in a build contract.
A good builder will confirm upfront which of these apply to your project, rather than leaving you to find out later.
What "fixed price" does and doesn't mean
A fixed-price contract should mean the agreed scope is priced clearly. It doesn't usually mean every possible third-party cost, owner-arranged item, council charge, variation, or unknown site condition is automatically included. Before signing anything, it's worth checking exactly what's included, what's excluded, and what assumptions the price is based on.
Why this matters in 2026
After the sharp post-pandemic cost increases, New Zealand residential construction cost growth slowed through 2023–2025. More recent industry reporting points to a steadier but still watchful market: overall construction inflation remains relatively low, but some key materials, including timber, cladding systems, and concrete, have recorded increases. Forecasts also point to construction activity rebuilding from 2026, which could put pressure on pricing if demand rises faster than the sector's capacity.
On a traditional on-site build, that risk sits with whoever is holding the contract when costs move and if the contract still has provisional sums in it for site works or foundations, that risk sits with you. A transportable home, properly priced before the contract is signed, closes that gap before it opens.
How Manor Build does this
This is exactly how we've built our own process, through what we call the 5D process, Discover, Design, Detail, Do, Deliver.
Once you sign up and move into the Detail phase, we get a geotech report on your site before anything else, because it determines your foundation type and shapes your septic and stormwater design. From there, we scope the rest of your site works, price any specific engineering your site needs, and check for anything that might require resource consent — sorting it before the build proceeds rather than after. At the same time, you'll sit down with us for a spec and finishes meeting to choose your cladding, joinery, kitchen, and bathroom fit-out, and those choices are priced too.
Once all of that is done, your design is frozen, and everything we've scoped and priced goes into one contract number covering the agreed scope, the home, the site works, the foundation solution, and your chosen finishes. From that point, the price shouldn't move unless you request a variation, an excluded item applies, or a stated contract assumption changes.
Before you compare transportable home prices, it's worth asking whether the quote in front of you includes site-specific foundations, services, consent planning, and freight or whether those are still estimates. Manor Build's Detail phase is built to resolve those items before you commit to a final contract number.
A note on this article
This article is general information only. Building, planning, council, site, engineering, and contract requirements can vary by property, council, design, contractor, and personal circumstances. All building work must comply with the Building Code, even where some work is exempt from requiring a building consent. Confirm the requirements and costs that apply to your specific site before proceeding.
Frequently asked questions
Is the price I'm first quoted the price I'll pay?
Not yet, and any transportable home builder should tell you that plainly. The first pricing you get is typically the house price plus estimated costs for freight, foundations, and services, based on general information like your site's zoning, region, and build size. That's a genuine starting estimate, not a site-specific final figure.
Why does a geotech report matter so much for a transportable home?
Because your ground conditions determine your foundation type, and they also shape how septic and stormwater systems get designed. Getting this sorted early means it's priced properly upfront instead of becoming a surprise once the build is underway.
Can the price still change after I've signed a fixed-price contract?
It shouldn't move outside of a few clear situations: if you request a variation, if an excluded item applies to your project, or if a stated contract assumption turns out to be incorrect. Provided the builder has properly scoped your site before the contract was signed, those should be the only reasons the price changes.
Will I know if my site needs a resource consent?
A properly run process should check this before the build starts, not partway through. That includes checking for things like boundary setbacks, site coverage, height, hazard overlays, and other planning triggers specific to your site and district.
What costs typically sit outside a transportable home contract?
Anything outside the agreed scope of works, council development contributions, consent fees for placing the home on-site, resource consent preparation costs, and landscaping. A good builder will confirm which of these apply to your specific project before you sign.
