Should You Buy or Hire a Site Cabin? A Decision Guide

Whether to buy or hire a site cabin comes down to how long you need it, how often it will be used again and who looks after it between jobs. Hiring hands most of the work of ownership to someone else for a set period. Buying costs more at the start but leaves you with a unit you can move to the next project or sell. Below are the factors and a way to compare the two with your own figures.

Eight factors that decide it

How long you need it, and how often it will be reused

Hire charges run for as long as the cabin stays, so a short job with a fixed end date usually favours hiring. A purchase price is paid once, so the longer the cabin is in use, the more weeks it is spread across.

Reuse matters as much as the length of one job. A cabin bought for one short project that then sits idle is expensive to own. One that moves from job to job earns back part of its price on every project.

How many sites you run

One site at a time with long gaps between jobs gives owned cabins little to do. Several sites at once, or jobs back to back, let the same office or welfare unit go straight from one compound to the next. Every Karmod container layout shares the same four footprints, so a compound planned around one set of offices and welfare units can be laid out again at the next site.

Layout and fit-out

When you hire, you normally choose from the units available. When you buy, you pick the closest layout, such as an office with a private office or a welfare unit with two entrances, and add options such as an electrical pack, an electric wall heater or air conditioning, plus a kitchen unit or a toilet and sink unit on the layouts that offer them. Changes such as a different door position are confirmed on a drawing before production.

Resale and redeployment

A bought cabin still has value when the job ends: you can move it to the next site, use it at your yard or sell it. Its resale value depends on condition, layout, demand and the cost of getting it to a buyer, so use a cautious estimate, or the hire charges you would avoid on the next project if you plan to reuse the unit.

Maintenance and repairs

Under many hire agreements the hire company looks after servicing and normal wear and charges the hirer for damage, so read the terms. When you own the cabin, upkeep is yours: locks, window seals, floor coverings, cleaning between jobs, frost protection for water pipes and periodic checks of the electrics by a qualified electrician.

Storage and transport between projects

Every move of an owned cabin is a delivery in its own right: services disconnected, a HIAB or crane lift and a prepared base at the next site. With hire, the hire company usually delivers and collects, and you pay for both. If you buy, you also need somewhere secure and level to keep the cabin between jobs. Our guide to preparing your site for cabin delivery covers what each move involves.

Insurance and security

Hire agreements often require the hirer to insure the cabin or pay a damage waiver, so check what is covered. An owned cabin needs cover on site, in transit and in storage, so ask your insurer. Karmod container layouts have a steel entrance door as standard, but a cabin standing empty between jobs still needs locking and regular checks.

Cash flow and accounting

Hiring turns the cost into regular charges that stop when the job ends and can be charged to one project. Buying means paying the purchase price at the start rather than spreading it over the job, unless you use finance, and puts an asset on your books. Ask your accountant how each option affects your accounts and tax, including whether capital allowances apply. Compare both sides on the same VAT basis: Karmod prices exclude VAT, delivery and offloading, so set out hire quotes the same way.

How to compare the cost of buying and hiring

Put both options side by side over the same period, and leave out costs you pay either way, such as the base, connecting services, power and day-to-day cleaning. Whichever you choose, the units must still meet the construction site welfare requirements for your project.

Cost of hiring: H = (W × r) + Dh + Ch

Net cost of buying: B = P + D + (n × m) + S + R + I − V

Letter	What it is	Source	Your figure
W	Weeks the cabin is needed	Your programme	weeks
r	Weekly hire charge, including any damage waiver or insurance the hire terms require	Hire quote	£
Dh	Total hire delivery charges, one for each job	Hire quote	£
Ch	Total hire collection charges, one for each job	Hire quote	£
P	Purchase price of the unit and its options	Purchase quote	£
D	Delivery and offloading	Formal purchase quote	£
n × m	Further moves, including taking the cabin off site at the end, times the cost of each	Your plans and a transport quote	£
S	Storage between jobs	Your yard or a storage quote	£
R	Maintenance and repairs	Your allowance for the period	£
I	Insurance for the period	Your insurer	£
V	Resale value, or hire avoided on the next job	Your cautious estimate	£

If B is lower than H, buying costs less over the period; if H is lower, hiring does. If they are close, the other factors above usually decide.

A worked example for the buying side

Say the job needs a self-contained office with its own toilet. A K2004 Site Office with WC & Kitchenette at 3.00m × 6.00m is £8,640 + VAT. With the standard electrical pack (£1,050 + VAT) and an electric wall heater (£375 + VAT), P = £8,640 + £1,050 + £375 = £10,065 + VAT, the sum of the listed prices before delivery and offloading. D comes from the formal quote for your postcode and the other letters from your own plans; on the hire side, take r, Dh and Ch from a quote for a comparable unit.

Finding the break-even point

To see how long the cabin must be in use before buying costs less, solve for W:

Break-even weeks = (B − Dh − Ch) ÷ r

Longer use, on one job or across several, favours buying; shorter use favours hiring. S, R and I grow with time, so work out B for the length of use you expect and recalculate if the answer is far from it. Try V at zero to see how much resale matters.

Signs that point one way or the other

Buying tends to suit	Hiring tends to suit
A long programme, or one likely to be extended	A short job with a fixed end date
Several sites at once, or jobs back to back	One site, with a long gap before the next
A particular layout or fit-out	Any standard unit will do
A yard to store it and a way to move it	No storage and no wish to organise moves
Cash or finance available now	Cost must be spread or charged to one job

Owning some units and hiring for peaks

You can own the units every job needs, such as a site office and a welfare unit, and hire extra cabins only for the busiest phase of a large project. The units you would need on every site over the next few years are the ones worth pricing for purchase. Our site office cabins and welfare cabins and WC units pages list the layouts with their prices.

Get a purchase price for your comparison

To fill in P and D, choose a layout, size and options and send a request through our quote page. Sending a request does not commit you to anything, and the formal quote confirms delivery to your postcode and the offload equipment needed. For what changes a cabin's price, see our portable cabin price guide. For other questions, contact our team or call 0116 403 0143, Monday to Friday, 8am to 6pm.