Technical Installation · 6 min read
How to Assemble a Flat Pack Shed: Panel-by-Panel Guide
Total Sheds arrive as factory-built panels, not loose boards. The full assembly sequence, honest timings and the mistakes that catch people out.
Two People, One Afternoon
Assembling Your Shed, Panel by Panel
Forget the flat-pack horror stories. Our buildings arrive as factory-built wall panels, so assembly is bolting finished pieces together in the right order. This is that order.
If you searched for "flat pack shed assembly", here's some good news: a Total Sheds building isn't flat-pack in the bundle-of-loose-boards, thousand-screws sense. Every building leaves our West Midlands workshop as finished panels — cladding fixed to tanalised framing, doors already hung, windows already glazed. Assembly is bolting those finished pieces together — not building walls from boards.
That's why the timings sound optimistic and aren't: two people will put up a 6x4 to 8x6 in two to four hours, and even a large building is half a day, not a lost weekend. Below is the whole sequence — what to have ready before the van arrives, the panel order, and the mistakes that catch people out. One thing first: none of it works without a solid, level base.
Before the Van Arrives
Ten minutes of preparation saves an hour of frustration on the day.
- A base flat and level to within 10mm — concrete, slabs or a proper timber base. Sort it before delivery day, not after.
- A second pair of hands for the whole session — the panels are manageable, but genuinely awkward on your own.
- Tools: cordless driver, spirit level, tape measure, stepladder, silicone gun. Nothing exotic.
- The assembly manual, downloaded from your product page and read once with a cup of tea.
- A dry, calm weather window — you'll thank yourself at the roofing stage.
- Clear access from the van to the base, with room to walk a panel round.
The Build, Panel by Panel
Your manual has the exact order; this is the shape of it for every building we make. The golden rule throughout: snug first, square, then tight.
- 1
Check the base and the parts
Put a spirit level across the base in several directions — you want flat and level to within 10mm. Then lay out the panels and check them against the parts list in the manual (there's a PDF on every product page).
Tip: If the base fails the level check, stop here — every later problem starts at this step.
- 2
Floor down first
Position the floor on the base and check it's square by measuring both diagonals, corner to corner. When the two measurements match, it's square. Everything else keys off this.
- 3
Stand the back wall
Lift the back panel onto the floor, flush to the edge. One of you holds it plumb while the other fixes it down — or brace it with timber if you need both hands free.
- 4
Sides join the back
Offer each side panel up to the back wall and fix through the corner framing. Run the fixings in snug — firm, but with a little give. You'll want that movement at step six.
Tip: If a firm push can still shift a panel a few millimetres, that's exactly right.
- 5
Front goes on last
The front is the heaviest panel — it carries the door, which is why it arrives already hung. Two people, no heroics: walk it in, fix to both sides, snug as before.
- 6
Square the building — then tighten
Measure the diagonals across the building. Nudge the walls until the measurements match and the door swings freely in its frame. Now — and only now — go round and tighten every fixing.
Careful: Tightening before squaring is the most common assembly mistake. A racked building fights you at every step after; a snug one squares up with a gentle push.
- 7
Roof on
Lift the roof panels up and fix them to the wall framing, then cover with felt or EPDM rubber. If your building has EPDM, our <a href="/how-to-install-epdm">animated fitting guide</a> covers the whole membrane, step by step.
Careful: Never roof in wind. A roof panel or sheet of membrane in a gust is a sail, and it doesn't care that you're up a stepladder. Wait for calm.
- 8
Trims, silicone and the door catch
Fix the fascias and corner trims, run a neat bead of silicone around the windows, and adjust the door catch so it closes with a click rather than a shove.
- 9
Treat anything you cut
The panels arrive pressure-treated, but any timber you cut or drill exposes fresh wood. Dab preservative on every cut and hole — two minutes' work that keeps your 15-year anti-rot guarantee exactly as written. Ongoing care is light; our <a href="/knowledge/maintenance">maintenance guide</a> covers the once-a-year jobs.
What Arrives Pre-Done
Walls clad and framed
Each wall is built complete in our workshop — cladding fixed to pressure-treated framing, square and ready to stand.
Doors already hung
Hinged, braced and fitted in the factory. The front goes up with the door swinging; you only adjust the catch.
Windows glazed
Fitted in the workshop. On the day you run a bead of silicone once the building is square — that's the lot.
Roof panels cut to size
Sized to your building and ready to lift straight on. Sawing required on assembly day: none.
The Honest Answer: DIY or Book Us In?
Crack on yourself if…
- You've got a willing helper and a free half-day
- Your base is flat, level and the right size
- You're comfortable with a cordless driver and a stepladder
- The building is a manageable size — around 8x6 is a gentle first build
Book installation if…
- You'd be working alone — this genuinely isn't a one-person job
- The building is large, or access to the base is tight
- Heights, heavy lifting or a packed weekend rule you out
- You'd rather it was done right, first time, by the people who built the panels
When it won't go together
Somewhere around step four or five you may meet a panel that won't quite line up. The instinct is to lean on it and let the screw pull it home. Don't. Our panels leave the workshop square — whether you bought off the shelf or designed yours in Build Your Shed — so when something won't meet, the building is telling you something further back isn't square. Nine times out of ten, that something is the base.
The fix is always the same: stop, loosen the fixings you've run in, re-check the floor's diagonals and re-square before carrying on. Forcing a panel onto a bad base builds the fault into the walls — and the door will remind you daily. If the base is the problem, our shed base guide shows what good looks like — and if you'd rather hand the job over, our installers will do it properly. Just have the base ready before they arrive, or talk to us and we'll help you plan it.
Assembly Questions, Answered Straight
How long does it take to build a shed?
With two people and the base ready, a 6x4 to 8x6 goes up in two to four hours; larger buildings take half a day or more. The real variable isn't the shed — it's the base. Get that flat and level beforehand and the day runs like clockwork.
Can one person assemble a shed?
Plan for two. The panels aren't especially heavy, but a full wall is big and awkward, and someone needs to hold it plumb while the other fixes. One person can handle preparation and finishing — but standing walls solo is how sheds get dropped and backs get hurt.
What tools do I need to assemble a shed?
A cordless driver, spirit level, tape measure, stepladder and silicone gun. That's genuinely the list — the fixings are supplied, and there's nothing exotic in the manual.
Do I need to treat the shed after assembly?
The framing is pressure-treated before it leaves us. The one job that matters: dab preservative on any timber you cut or drill — a fresh cut exposes untreated wood. Two minutes' work, and it keeps the 15-year anti-rot guarantee exactly as written.
What if a panel arrives damaged?
Don't build it in. Check the panels as they come off the van, photograph anything that's taken a knock and get in touch straight away — we made the panel in our own workshop, so replacing it is straightforward.
Up in an afternoon, standing for decades
Every building leaves our West Midlands workshop as finished panels — manual on the product page, installation team a phone call away. All that's missing is yours.
Browse the rangeReady to put it into practice? Every building is made in our West Midlands workshop with free mainland delivery.
Browse buildings →
