A render on its own
- A picture of the room
- The floor area: 12 m²
- Materials guessed from the area, if at all
- No frame, no sheets, no roof build-up, no fixings
You still have to work out the structure before you can order anything.
Free in your browser · no sign-up
Your garden room in 3D, with the exact materials to buy.
Enter the size. Get the frame, sheets, cladding, roof and base, worked to your country's practice.
- Works on your phone
- Summary PDF free
- Metres or feet
- No invented prices
Live drawing
Materials list
4 m
Vertical timber slats
- Frame studs
- 48 × 2.67 m
- Sheets (floor, walls, roof)
- 23
- Cladding boards
- 247 incl. 10% waste
- Insulation packs
- 11
Same maths as the full tool, UK practice. Change the size to see it recount.
Choose the job
A focused tool for each structure.
Each tool asks only for what matters to that structure. Preview its first material lines free; the complete list comes with the paid pack.
Garden room
Garden room calculator
Size a garden room shell and count the frame, sheets, cladding, roof, insulation and base materials.
3D shell · materials list preview · summary PDF
Calculate my garden roomDeck tool
Deck + pergola designer
Set the footprint, height, boards, railings, stairs and pergola. See the model update, then check framing and quantities.
3D model · materials list preview · summary PDF
Calculate my deckFence
Fence calculator
Lay out a fence run and calculate panels, posts, rails, boards, concrete and fixings from its actual length.
3D view · materials list preview · summary PDF
Calculate my fenceWhy it matters
A nice 3D picture is not a shopping list.
A picture shows the look. A materials list tells you what to order.
BuildPlot3D materials list
- Floor area
- 12 m²
- Frame studs
- 48 × 2.67 m
- Sheets (floor, walls, roof)
- 23
- Cladding boards
- 247 incl. 10% waste
- Insulation packs
- 11
The full materials list also covers roof covering, base and fixings. Preview the first lines free; unlock the remaining quantities and order-ready files in the Full Build Pack.
Numbers above are worked out live by the same maths the calculator uses (UK practice, Vertical timber slats). It is a materials list, not a structural design.
Get the list for your garden roomWho it's for
Building it yourself, or building it for a client.
Same tools, same counts. What you do with the list is different.
For homeowners doing it themselves
You know what you want to build. You don't want to guess how much timber to buy.
- See the full structure in 3D before you buy anything
- Get one list to take to your merchant for a quote
- Buy it all in one trip, in the lengths they actually sell
For builders quoting jobs
Measure on site, count the materials in minutes, and send the client something clean.
- Count the materials on your phone, in front of the client
- Export the order sheet to send to your yard for a price
- Put your own name on the pack and the shared page
Inside the pack
The pages you take to the yard and the site.
Every tool builds the same set of pages for your exact design, with your name on them.
Page 1
Dimensioned plan
Scaled plan with every outside measurement.
Page 2
Cut list
Each piece, its length and how many to cut.
Page 3
Merchant order sheet
Grouped by merchant counter, ready to hand over.
Page 4
Marking out the ground
Post and footing positions, and where to start.
Page 5
Build order
The steps in the order you do them on site.
Page 6
Customer acceptance
A sign-off page for the job, with your name on it.
Thumbnails show the page layout only. Open the sample pack to see a real one, worked out for a real size.
Start from a popular style
Popular starting builds.
Pick a build, then adjust the size in the tool.
Free vs the pack
Use the tool for free. Pay once for the pages you build from.
The free preview shows the model, checks and first material lines. The paid pack unlocks the full quantities and the files for ordering, cutting and building.
Free
$0No account needed. A free account keeps 25 jobs.
- The 3D drawing, regional checks and first materials list lines
- A PDF summary with the design, overall measurements and checks
- Your own supplier prices, on any plan
Full Build Pack
$9 per jobOne payment. No subscription. Kept for good.
- Full material quantities beyond the free preview
- Dimensioned framing plan and the exact cut list, packed into stock lengths
- CSV merchant order file, ready for a supplier or spreadsheet
- Marking out: the diagonal to pull so the frame is square before anything is fixed
- Merchant order sheet: only things a merchant can hand over, each line checked and in your own units, with a box to tick
- Build order: each stage in sequence, with the check that goes with it
- Your company name on the PDF and the shared page, with our line gone
Doing this every week? Plans from $19/mo
Built the local way
Your country's materials, not someone else's.
Pick your country and the tools switch to the stock sizes and build methods used there. Materials from different regions never mix in one list.
UK and Ireland
Metres by default- 400 mm stud and joist centres, metric sheets
- Ground screws or concrete pads under garden rooms
- Flush beams on decks, slotted concrete fence posts
- Feather edge, cedar, composite and slatted cladding
US and Canada
Feet and inches by default- 16 in centres, 4 × 8 ft sheets, nominal lumber
- Concrete footings taken below the frost line
- Drop beams on decks, cable or baluster railing
- Lap siding, board and batten and cedar
A materials list to local building practice, not a structural design or a building-control approval.
Materials list
Quantities, cut lengths, stock and fixings before ordering.
Full Build Pack
Dimensioned plan, cut list, order file and site sequence.
Regional setup
UK, Irish, US or Canadian practice, in metres or feet.
Saved jobs
A free account keeps 25 jobs with your own rates.
Common questions
What to know before you start.
Does it work on a phone?+
Yes. The designer, the 3D model and the materials list are built for a phone first, so you can change measurements on site. No app to install.
Which board length wastes least?+
The designer compares common stock lengths for the country you pick and shows the offcut percentage for each. You can then choose the option that suits the job.
What can I do without an account?+
You can use the designer, inspect the 3D model, regional checks and first materials list lines, and export a summary PDF. The remaining quantities, merchant CSV, dimensioned plan and exact cut list come with a Full Build Pack or paid plan. You can buy one job pack without creating an account first; saving jobs separately needs an account.
Are the prices supplied by BuildPlot3D?+
No. Material and labour prices vary by supplier and account. Costs appear only after you enter your own rates; BuildPlot3D does not insert national averages or invented prices.
What is on the merchant order sheet?+
Only things a merchant can hand over: boards, timber, posts, concrete, sheets and fixings, in metres or feet to match your job. Every line is checked before the pack prints, so there are no zero lines, repeats or mixed units. It comes with a one-off job pack or any paid plan, for decks, fences and garden rooms.
Is this a structural design or final quote?+
No. It is a planning aid that works out your materials list. Check the structure, local requirements and final order before construction.
No account required