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Campervan conversion cost: what a UK build really adds up to

8 min read

Most conversion budgets fail for the same reason: the figure is picked before the specification exists. These are the real numbers Skiddy uses when it prices a build — by van size, then category by category — so you can set a budget that survives contact with the van.

The short answer

For a UK self-build, expect roughly £3,000–£7,000 for a simple small-van camper, £6,000–£16,000 for a medium van such as a Transporter, Trafic or Vivaro, and £14,000–£30,000 for a large van with a fixed bed, washroom and a serious off-grid electrical system. Premium specifications on a Sprinter or Ducato reach £50,000. All of that sits on top of the cost of the vehicle.

Conversion cost by van size

Ranges below cover the conversion only, excluding the vehicle purchase.

Van sizeBudget buildMid-rangePremium
Small van (Caddy, Berlingo, Connect)Micro-camper: bed, small 12V system, portable cooking.£2,500 – £4,000£3,000 – £7,000£7,000 – £10,000
Medium van SWB (Transporter, Vivaro, Trafic)Side kitchen, rock-and-roll bed, 100–200Ah leisure battery.£3,500 – £7,000£6,000 – £12,000£12,000 – £20,000
Medium van LWB (Transporter LWB, Custom LWB)Fixed or convertible bed, diesel heater, hot water possible.£5,000 – £9,000£8,000 – £16,000£16,000 – £28,000
Large van (Sprinter, Ducato, Boxer, Crafter)Fixed bed, washroom, shower, 300Ah+ lithium and solar.£8,000 – £15,000£14,000 – £26,000£25,000 – £50,000

Where the money actually goes

This is the same category breakdown Skiddy uses to cost a personalised blueprint. Figures are for a medium-to-large UK van; small vans sit below the range, super-high-roof builds add 15–20% on materials.

CategoryTypical spendWhat it covers
Insulation and sound deadening£450 – £950Closed-cell foam, wool, vapour barrier and deadening mats. Scales with van length.
Windows, vents and roof fan£400 – £900Bonded window, roof fan and sealant. Off-grid builds usually need more ventilation.
Timber, cladding and flooring£900 – £2,500Mixed ply and vinyl at the lower end; birch ply and hardwood trim at the top.
Electrical system£700 – £4,500Battery bank, solar, charger, inverter and distribution. The single biggest swing factor.
Kitchen and appliances£500 – £2,000Hob, fridge, sink, tap and worktop. A compressor fridge alone is around £520.
Water system£300 – £1,500Fresh and grey tanks, pump and plumbing. Hot water adds roughly £480, an indoor shower another £350.
Heating£320 – £950Diesel heater at both ends of the quality scale; wood burners around £700.
Bed, upholstery and soft furnishings£450 – £1,600A crash-tested rock-and-roll bed with belts is around £1,200 fitted.
Fixings, consumables and safety kit£350 – £600Rivnuts, screws, adhesive, sealant, CO and smoke alarms, extinguisher.

Self-build vs professional conversion

A professional conversion of a medium van typically starts around £25,000 and rises quickly with a washroom or a large lithium system, because labour is the biggest single line item. A self-build to the same specification usually lands at 40–60% of that figure — you are paying for parts, not hours.

The saving is real, but it is only a saving if you buy each component once. Re-doing an undersized electrical system or rebuilding furniture that pushes you over the plated weight erases the difference fast.

Four costly budgeting mistakes

Forgetting the van itself

Conversion cost and total cost are different numbers. A tidy used medium van is typically £8,000–£18,000 before you spend a penny on the build.

No contingency

Most first builds overrun. Hold back around 15–20% of your budget — you will find rust, a wiring surprise or a part that does not fit.

Buying the electrics twice

Undersizing the battery bank is the most common expensive mistake. Size it from your real daily watt-hours and off-grid days, not from what looks affordable.

Ignoring payload

Water, batteries and timber are heavy. Going over the plated weight means a rebuild, not a tweak — check the VIN plate before you specify anything.

Frequently asked questions

How much does a campervan conversion cost in the UK?

A self-build campervan conversion typically costs £3,000–£7,000 for a simple small-van build, £6,000–£16,000 for a medium van such as a Transporter or Trafic, and £14,000–£30,000 for a large van with a fixed bed and washroom. Professional conversions usually start around £25,000 on top of the vehicle.

Is it cheaper to convert a van yourself?

Yes. A self-build usually costs 40–60% of a professional conversion of the same specification because labour is the largest line item in a paid build. The trade-off is your time and the cost of mistakes, which is exactly what a planned blueprint reduces.

What is the most expensive part of a van conversion?

The electrical system. A lithium battery bank with solar, an inverter and a proper charging setup can range from £700 to over £4,500 depending on capacity and off-grid ambitions.

How long does a campervan conversion take?

A weekend-and-evenings self-build on a medium van typically takes 3–6 months. Working full time, a competent builder can complete the same specification in 4–8 weeks.

Get a costed budget for your exact van

Answer the Skiddy consultation and you get a personalised budget breakdown for your vehicle, layout and appliances — with the headroom, weight and specification checked against your payload.

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