PlanSwift takeoff software measures off the drawing on screen, then turns each measurement into a full material list through what it calls an assembly. Draw one partition and you get the studs, the plates, the boards, the insulation and the fixings in a single action. That is the reason people use it, and it is also the reason a small mistake in it does not stay small.
Here is what an assembly actually contains, the arithmetic underneath it, and how to check a takeoff before you commit a price to it.
What PlanSwift takeoff software actually does
The base job is on-screen takeoff. You load a PDF or an image of the drawing, set the scale, and measure by clicking along walls, around rooms and over areas. The software adds up linear metres, square metres, cubic metres and counts as you go, so nothing is scaled with a ruler and nothing is added up by hand.
Plenty of packages do that much. What PlanSwift is known for is the layer on top: assemblies. An assembly is a stored recipe that says what one unit of something is made of. Attach it to a measurement and the software applies the recipe across the whole quantity.
Measure 38 linear metres of stud partition with a partition assembly attached, and you do not get "38 m". You get a stud count, a plate length, a board count, an insulation area and a fixings allowance, all at once.
Assemblies are the whole point, and the whole risk
The saving is obvious. The exposure is less obvious, and it is the same mechanism working against you.
An assembly is a multiplier. Whatever is inside it gets applied to every metre you measure with it. If the recipe is right, you have priced 38 metres correctly in one action. If the recipe is wrong — wrong board size, wrong stud centres, a waste percentage carried over from a different job — then you have applied that error to 38 metres in one action too, and it will look exactly as confident either way.
This is worth understanding properly, because a takeoff done with assemblies rarely fails in a way you can spot by eye. The quantities are internally consistent. They are just consistently wrong.
What one partition actually contains
Take an internal stud partition, 2.4 m high, running 38 m, boarded both sides.
Wall area: 2.4 × 38 = 91.2 m²
The assembly, unpacked
- Studs at 600 mm centres: 38 ÷ 0.6 = 63.3, call it 64 studs at 2.4 m
- Head and sole plates: 38 × 2 = 76 lin m
- Plasterboard, both sides: 91.2 × 2 = 182.4 m². At 2.4 × 1.2 per board (2.88 m²), that is 182.4 ÷ 2.88 = 63.3 → 64 boards, plus 10% waste = 70 boards
- Insulation: 91.2 m²
- Screws, tape and jointing compound: an allowance, not a measure
Now price it. Round figures to show the shape of a build-up, not our rates — use your own:
- 64 studs at £6.20 — £396.80
- 76 lin m of plate at £2.40 — £182.40
- 70 boards at £9.80 — £686.00
- 91.2 m² insulation at £4.10 — £373.92
- Fixings, tape and compound — £145.00
- Materials — £1,784.12
- Labour, 91.2 m² at £22.00 — £2,006.40
- Sub-total — £3,790.52
- Overhead and margin at 15% — £568.58
- Total — £4,359.10, or about £47.80 per m²
Now change one line in the recipe
Say the specification calls for 3.0 × 1.2 boards, not 2.4 × 1.2, and the assembly was never updated.
At 3.6 m² per board: 182.4 ÷ 3.6 = 50.7 → 51 boards, plus 10% waste = 57 boards.
The assembly said 70. The job needs 57. You have over-ordered by 13 boards on a single partition run, and paid to have them delivered, stored and taken away again.
Thirteen boards is not a disaster. The problem is that the same recipe is attached to every partition on the job. Twenty similar runs and you are 260 boards out, on an error that appeared nowhere on screen and required no bad measuring at all.
Stud centres do the same thing in the other direction. Drop from 600 mm to 400 mm and the count goes 38 ÷ 0.4 = 95 studs, against 64. That is 31 extra studs on one wall, £192.20 at the rate above, and it is a real cost you will carry if the assembly still says 600.
Where assemblies go wrong
- Inherited from another job — the fastest way to start, and the fastest way to import last year's board size, spacing and waste figure
- Waste baked in twice — once inside the assembly, once again in the rate, so you carry 21% and think you carry 10%
- Scale never verified — a PDF issued at the wrong scale makes every quantity wrong by the same ratio, and assemblies hide it behind a plausible material list
- Openings not deducted — some recipes deduct, some do not; a partition run with three door openings is not 91.2 m² of board
- Standard ignored — an assembly measures what its author decided, which may not match how the bill was measured
That last one matters more than it looks. Measurement is set by the standard the job is issued under, which in the UK is NRM2 and in Australia and New Zealand is ANZSMM. Both dictate what is deducted and what is not, so two estimators measuring the same wall arrive at the same figure. The RICS new rules of measurement set out the UK rules in full. Software follows the recipe it was given; it does not know which standard your bill was written to.
Checking a takeoff you did not do yourself
Whether the file came from a colleague, a subcontractor or an estimator, the same six checks apply before the numbers go anywhere near a tender:
- Was the scale calibrated against a known dimension on the drawing, or taken on trust from the title block?
- Which drawing revision was measured, and is it the current one?
- Open one assembly and read it. Do the component sizes match this specification?
- Is waste inside the assembly, inside the rate, or both?
- Spot-check one quantity by hand. If the wall is 38 m and 2.4 m high, does the area come back at 91.2 m²?
- Are openings deducted, and does that match how the bill measures them?
The hand check is the one people skip and the one that catches scale errors. It takes two minutes and it tests the whole chain.
How it compares with the alternatives
PlanSwift's strength is turning a measurement into a material list. That is a different job from keeping a price attached to a quantity through forty drawing revisions, which is where a package like Cubit estimating software earns its keep by holding the takeoff and the estimate in one linked file.
A spreadsheet does neither, and is still the right answer for a two-line variation. Most estimators end up using more than one, and the choice is less about the software than about what the job keeps doing to you: revisions, or repetition.
Who works this way
- Main contractors
- Subcontractors
- Developers
- Quantity surveyors
- Architects
FAQ
What is PlanSwift takeoff software? PlanSwift is on-screen takeoff and estimating software. You measure directly over a PDF or image of the drawing, and it converts those measurements into quantities and material lists. Its defining feature is assemblies, which turn a single measured line into every component that line contains.
What is an assembly in PlanSwift? A stored recipe describing what one unit of something is made from. Attach a partition assembly to a measured wall and the software returns studs, plates, boards, insulation and fixings for the whole length, rather than just the linear metres you drew.
Can PlanSwift take off from a PDF drawing? Yes, and most takeoffs are done that way. The scale must be set before you measure, ideally calibrated against a dimension printed on the drawing rather than trusting the title block, because a wrong scale makes every quantity wrong by the same ratio.
Does PlanSwift include waste in its quantities? Only if the assembly says so. Waste is a setting inside the recipe, not something applied automatically. Check whether it sits in the assembly, in your rate, or has been added in both places, which is a common way of double-counting.
Is PlanSwift better than a spreadsheet for takeoffs? For repetitive work, yes, because one measured line produces the whole material list. For a short, settled job a spreadsheet is quicker. The saving comes from repetition, so it grows with the number of similar elements on the job.
Do I need takeoff software to get an estimate? No. If you send drawings to an estimator, the software is their problem, not yours. What you should ask for is the measured quantities and the rate build-ups, in a format you can open and check.
Where to start
If you would rather not carry a takeoff licence or the hours that go with it, send us the drawings and we will measure and price the job for you. You get the quantities, the rate build-ups behind them and a fixed fee agreed before we start — send the drawings over and we will come back with a turnaround date. We also produce fully measured bills of quantities and estimates and cost plans, and can check a takeoff you already have.