Outdoor Assembly Cost Guide

Outdoor furniture and structure assembly in the UK typically costs £60–£250 per item depending on complexity. Sheds, gazebos, BBQs, garden offices, hot tubs and trampolines all fall into this bracket — anything that arrives flat-packed and needs putting together where it'll live. Hourly rates of £35–£60 are common for assemblers; fixed-price jobs are widespread for known products.

Assembly is one of those jobs where the spec sheet says "2 hours" and the reality is 5. A flat-pack shed with 200 parts and an instructions booklet from an unrelated product is the classic example.

Typical UK assembly costs

What an assembly service typically includes

• Unboxing and inventory check — verify all parts are present before starting (saves return trips).
• Position and level the base — particularly important for sheds, trampolines and gazebos.
• Assembly per manufacturer instructions — using their fixings and supplied tools where appropriate.
• Anchoring or weighting — gazebos, parasols, trampolines need securing in UK winds. Ground stakes or weighted bases as appropriate.
• Test and demonstrate — moving parts (folding chairs, swings, BBQ ignition) tested before leaving.
• Disposal of packaging — usually included; some charge extra for cardboard and polystyrene removal.

What's typically NOT included

• Site preparation (leveling ground, laying paving slabs, concrete bases) — usually a separate landscaping job.
• Electrical or plumbing connections (BBQ gas hookup, hot tub power, garden office mains) — needs a Gas Safe / Part P registered tradesperson.
• Replacement of damaged or missing parts — assembler may pause and ask you to source replacements.
• Mounting to walls or fences without prior agreement.

Garden office and shed assembly — special considerations

Larger structures (sheds 6×8 ft+, gazebos, garden offices) need:

• Level base — pavers, concrete, or pressure-treated timber bearers. The base must be square and level within 5 mm.
• Two-person job — most one-person assemblers will charge for an additional pair of hands or refuse single-handed installations of larger structures.
• Roof and felting — pre-fitted on some kits, separate on others. Felting in particular is finicky and often poorly finished by DIY.
• Doors and windows aligned — diagonal squareness affects whether doors close properly. Easy to get wrong.

Things people often miss

• Site prep is your job — most assemblers won't excavate or pave. Have the base ready before they arrive.
• Hot tub electrics — most hot tubs need a 32A dedicated circuit on RCD, with the cabling run by a Part P electrician before delivery. Don't book the hot tub until the electrics are commissioned.
• Trampoline ground anchors — UK winds will move an unanchored trampoline into a neighbour's garden. Anchor kits cost £20–£40; well worth the spend.
• Shed doors swelling — ungalvanised hinges and swelling timber cause sticking doors within a year. Discuss with the assembler whether they pre-treat the timber.
• BBQ gas connection — propane bottle connection is fine for the homeowner; mains gas hookup needs a Gas Safe engineer.
• Permitted development limits — sheds and gazebos typically need to be under 2.5 m at the eaves (within 2 m of a boundary) and not cover more than 50% of the garden to avoid planning permission. Check before assembly.

Frequently asked questions

How much does it cost to assemble a flat-pack shed?

£250–£600 for a typical 8×6 ft garden shed, depending on complexity. Larger or more complex sheds (apex roofs, integrated porches, double doors) are at the upper end. Includes anchoring to the base but not the base itself.

Will the assembler bring tools?

Standard hand tools yes — drills, screwdrivers, levels, mallets. Power tools depending on the assembler; some bring full impact-driver kits, others just basic drills. Specialist tools (heavy crowbars, scaffolding for large structures) are usually their responsibility but worth confirming when booking.

Do I need to be present?

For the start (to confirm position, sign off layout) and end (sign off completion). Middle hours can be unsupervised if you're confident with the assembler. For complex structures with decisions to make (door orientation, window position), best to be on call by phone.

Can the assembler help with site preparation?

Some include light groundwork (clearing leaves, basic levelling); most expect the base ready. For paving slabs, concrete bases, or significant landscaping, hire a landscaper separately and have it complete before the assembly date.

What if parts are missing?

The assembler should pause and notify you. You'll need to contact the supplier for replacement parts (which can take days). Some will arrange a return visit at minimal extra charge once parts arrive.

Is assembly insured?

Reputable assemblers carry public liability insurance covering damage to your property during the work. For high-value items (large garden offices, hot tubs over £5,000), check the cover limit — sometimes insufficient for the replacement value.

Want a local pro to handle this? A handyman or general assembler will save you the weekend you'd lose to flat-pack instructions. Worth the £100–£300 for anything more complex than a small bench — and definitely for sheds, hot tubs, and garden offices.