Why is the answer an area when a scaffold is made of tubes?

Because that is how it is bought. A hire company prices the elevation it has to cover and charges by the square metre of face — length along the wall multiplied by height to the top working platform — and the tubes, boards and fittings are its problem rather than yours. Quoting that way also means the same wall costs roughly the same whoever erects it, which is what lets you compare two prices at all. The tube count matters to the scaffolder, and to you only through the duty class, which changes how close the standards have to be and therefore what the square metre costs.

Which height do I measure to — the eaves or the ridge?

To the highest platform people will stand on, which for most roof work is at or just above the eaves rather than at the ridge. A house with 5.5 m eaves and an 8 m ridge is scaffolded to about 5.5 m, with the guard rail and toe board above that, because nobody works from a platform level with the ridge — they work off the roof itself or off a separate roof-edge protection. Measuring to the ridge overstates a domestic scaffold by around a third. On a sloping site, measure from where the standards actually bear, which is the low end.

Why does the bay count jump when the wall gets slightly longer?

Because a part bay is still a bay. Standards go in at fixed centres and a leftover 300 mm at the end still needs a pair of them, along with the ledgers, the transoms and the boards for that bay. So a 12.5 m elevation at 2.1 m bays costs six bays exactly as a 12.6 m one does, and the step falls in a place that has nothing to do with the wall. It is worth knowing before an argument about a quote, because the extra bay is real work and not a rounding up of the price.

What does the duty class actually change?

The bay length, and through it everything else. Light duty — inspection, painting, nothing stored on the lift — allows about 2.4 m between standards. General trade duty is around 2.1 m. Heavy duty, where materials are stacked out on the platform, comes down towards 1.8 m. Shorter bays mean more standards, more fittings and more of everything per square metre of the same wall, which is why the duty is agreed before the price. The failure that matters runs the other way: a scaffold erected for painting and then loaded with a pallet of blocks is carrying a load it was never designed for, and it does not announce that it is overloaded until it moves.

Why does the number of weeks matter so much?

Because hire is charged for every one of them and the scaffold stands through the whole programme, not through the days somebody is on it. It goes up before the first trade arrives and comes down after the last inspection, and in between it stands through waits for materials, for weather and for other trades. On a job that overran, the hire is routinely the larger half of the scaffolding cost while the erect-and-dismantle figure was the one in the estimate. If the programme is uncertain, price the weeks you expect and ask what a further week costs, because that is the number you will be spending.

Materials & Quantities

Scaffold Face Area and Hire Quantity Calculator

Work out the face area a scaffold is quoted on, with the lifts, bays and standards that go with it — and what the weekly hire adds while it stands.

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Every formula citedNamed published standards
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SettingsSettings for this calculationUS

Market

Imperial · sales tax

Elevation length

The run of wall the scaffold covers, measured along the ground.

Measure the face, not the building's footprint. A return around a corner is a separate elevation with its own area, and most quotes list them separately because the corner bay is a different job. Add the overhang the scaffold needs past each end — a scaffolder will not stop the deck flush with the brickwork, because there is nothing to stand on to reach the last course.

Height to the highest working platform

Ground to the deck people will actually stand on, not to the ridge.

The scaffold is measured to its top working lift. For roof work that lift sits at or a little above eaves level, and the guard rail and toe board go above it — so a house scaffold to a 5.5 m eaves is quoted at about that height rather than at the 8 m ridge. Measure from where the standards actually bear, which on a sloping site is the LOW end.

Lift height

Vertical spacing between platform levels.

Two metres is the usual working lift and gives comfortable headroom under the lift above. It is shortened where a specific working height is wanted — bricklayers often ask for lifts set so the course being laid sits between waist and chest, because a wall built at shoulder height is slow and hard on the back.

Bay length

Spacing between standards along the face, set by duty class.

Bay length falls as the duty rises, because the boards and the standards are carrying more: roughly 2.4 m for light duty such as inspection or painting, around 2.1 m for general trades, and down towards 1.8 m for heavy duty where materials are stacked out on the lift. If you do not know the duty, the honest default is general — a scaffold designed for painting and then loaded with blocks is a real and serious failure.

Weeks on hire

How long it stands, from erection to dismantle.

Count the whole programme, not the days somebody is on the scaffold. It goes up before the work starts and comes down after the last inspection, and it stands through every wait for materials, weather and trades in between. This is the figure that turns a modest erect-and-dismantle price into the larger half of the cost, and it is the one most often guessed low.

Scaffold face area

761 ft² of face

Medium confidence

Multiply the face area by the weeks to compare quotes on the same basis — a low erect-and-dismantle price with a high weekly rate overtakes a higher one somewhere around week six, and that crossover is worth finding before signing. This is a take-off for an enquiry, not a design. Whether this scaffold is compliant depends on ties, bracing, ground bearing, edge protection and the duty it is actually loaded to — all of which belong to the scaffolder's TG20 compliance sheet or to a bespoke design, not to an area.

Lifts: 3 levels
Bays: 6 bays
Standards (both rows): 14 uprights
Boarded deck length, all lifts: 126 ft
Weeks on hire: 8 weeks

Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

Scaffolding is quoted and hired by the square metre of elevation face (length x height to the highest working platform), with a separate weekly hire charge for the duration it stands
NASC TG20:21, the industry guidance for tube-and-fitting scaffold: a lift is commonly 2 m, and bay length reduces as duty class rises — 2.4 m at light duty down to about 1.8 m at heavy duty, because the boards and the standards carry more
An independent tied scaffold carries two rows of standards, inner and outer; each row has one more standard than the number of bays

Inputs used

Elevation length: 39 ft
Height to the highest working platform: 19.5 ft
Lift height: 6.5 ft
Bay length: 7 ft
Weeks on hire: 8

Intermediate steps

Lifts: 3 levels
Bays: 6 bays
Standards (both rows): 14 uprights
Boarded deck length, all lifts: 126 ft
Weeks on hire: 8 weeks

Final result760.5 ft² of face

Confidence note: Multiply the face area by the weeks to compare quotes on the same basis — a low erect-and-dismantle price with a high weekly rate overtakes a higher one somewhere around week six, and that crossover is worth finding before signing. This is a take-off for an enquiry, not a design. Whether this scaffold is compliant depends on ties, bracing, ground bearing, edge protection and the duty it is actually loaded to — all of which belong to the scaffolder's TG20 compliance sheet or to a bespoke design, not to an area.

What this calculation does not cover

One elevation. A building is scaffolded face by face, and each return is quoted separately because the corner bay is a different piece of work.
Does not decide the duty class, which sets the bay length and therefore the whole standard count. Guessing light duty and then stacking materials on the lift is a serious and common failure.
Does not cover ties, which are what stop an independent scaffold falling away from the building, nor the facade's ability to take them — a tie into failed pointing is not a tie.
Does not price it. Rates vary far too much by region, height, access and duration for a number here to be worth having; this gives the quantity a quote is built on.

Estimated cost — your price

Price per ft² of face ($)

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Schematic, drawn to the proportions you entered — not to scale on screen.

Part of bigger jobs

This trade is one line of several job takeoffs. Run the whole job and every other trade comes back with it, off the same measurements.

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Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-02 · in the site-wide review of 2026-09-06 · v1.0.1

Regulatory standards & verification citations3

Scaffolding is quoted and hired by the square metre of elevation face (length x height to the highest working platform), with a separate weekly hire charge for the duration it stands
NASC TG20:21, the industry guidance for tube-and-fitting scaffold: a lift is commonly 2 m, and bay length reduces as duty class rises — 2.4 m at light duty down to about 1.8 m at heavy duty, because the boards and the standards carry more
An independent tied scaffold carries two rows of standards, inner and outer; each row has one more standard than the number of bays

Cite this page

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Tools and safety for this job

To scaffold the elevation. Generic types, no brands, no prices.

Protection this work requires

Boards, blocks and bagged material cause most lasting back injuries on small sites: two people or a lifter for full sheets, and never a bag on one shoulder up a ladder.
Most fatal falls on small jobs are from under three metres: use a tower or a ladder tied at the top, and never work off the top two rungs.

Scaffold the elevation: This site does not publish a tool list for scaffolding. In every market it serves, a scaffold is put up, altered and taken down by trained scaffolders to a design or a standard configuration, and is inspected before first use and at the intervals local rules set. The face area is here to discuss and to hire against; the scaffold is the scaffolder's job, and so is the inspection record that goes with it.

Now that you have the number

These guides cover the work this quantity is for.

Tying a Scaffold to a Facade Without a Bespoke Design

Called something else where you work? Scaffold members — the term in each market, how close the equivalence really is, and the standard that governs it.

Still deciding? Scaffold vs Ladder — the factors that actually differ, with no invented prices.

How to calculate scaffold face area and hire quantity in 6 steps

Elevation lengthThe run of wall the scaffold covers, measured along the ground.
Height to the highest working platformGround to the deck people will actually stand on, not to the ridge.
Lift heightVertical spacing between platform levels.
Bay lengthSpacing between standards along the face, set by duty class.
Weeks on hireHow long it stands, from erection to dismantle.
Scaffold face areaThe tool computes the scaffold face area from those figures and shows the formula, its sources, and a confidence rating alongside it.

Scaffold face area by elevation length

Page defaults, not your figures above.

Elevation length	Scaffold face area (ft² of face)
20 ft	394
30 ft	591
40 ft	787
50 ft	984
60 ft	1,181
70 ft	1,378

Frequently asked questions

Why is the answer an area when a scaffold is made of tubes?: Because that is how it is bought. A hire company prices the elevation it has to cover and charges by the square metre of face — length along the wall multiplied by height to the top working platform — and the tubes, boards and fittings are its problem rather than yours. Quoting that way also means the same wall costs roughly the same whoever erects it, which is what lets you compare two prices at all. The tube count matters to the scaffolder, and to you only through the duty class, which changes how close the standards have to be and therefore what the square metre costs.
Which height do I measure to — the eaves or the ridge?: To the highest platform people will stand on, which for most roof work is at or just above the eaves rather than at the ridge. A house with 5.5 m eaves and an 8 m ridge is scaffolded to about 5.5 m, with the guard rail and toe board above that, because nobody works from a platform level with the ridge — they work off the roof itself or off a separate roof-edge protection. Measuring to the ridge overstates a domestic scaffold by around a third. On a sloping site, measure from where the standards actually bear, which is the low end.
Why does the bay count jump when the wall gets slightly longer?: Because a part bay is still a bay. Standards go in at fixed centres and a leftover 300 mm at the end still needs a pair of them, along with the ledgers, the transoms and the boards for that bay. So a 12.5 m elevation at 2.1 m bays costs six bays exactly as a 12.6 m one does, and the step falls in a place that has nothing to do with the wall. It is worth knowing before an argument about a quote, because the extra bay is real work and not a rounding up of the price.
What does the duty class actually change?: The bay length, and through it everything else. Light duty — inspection, painting, nothing stored on the lift — allows about 2.4 m between standards. General trade duty is around 2.1 m. Heavy duty, where materials are stacked out on the platform, comes down towards 1.8 m. Shorter bays mean more standards, more fittings and more of everything per square metre of the same wall, which is why the duty is agreed before the price. The failure that matters runs the other way: a scaffold erected for painting and then loaded with a pallet of blocks is carrying a load it was never designed for, and it does not announce that it is overloaded until it moves.
Why does the number of weeks matter so much?: Because hire is charged for every one of them and the scaffold stands through the whole programme, not through the days somebody is on it. It goes up before the first trade arrives and comes down after the last inspection, and in between it stands through waits for materials, for weather and for other trades. On a job that overran, the hire is routinely the larger half of the scaffolding cost while the erect-and-dismantle figure was the one in the estimate. If the programme is uncertain, price the weeks you expect and ask what a further week costs, because that is the number you will be spending.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.