Scanning Plans and Drawings: What to Specify

Before commissioning scans of paper plans or drawings, describe the physical sheets, the details that must remain readable and what people will do with the files. A useful reference image, a searchable drawing set and editable design data are different requests. Sheet size alone does not define the work.

For a Sydney property or project team, the starting material might include printed layouts, hand-marked copies and drawings with uncertain revision status. A short, drawing-specific brief helps a supplier assess that material without assuming every sheet can be handled or processed in the same way.

Start with the task the digital drawing must support

Name the intended application and the activity people need to complete. For example, “find the drawing number and read the maintenance notes” is more useful than “make the plans digital”.

This is a scope table, not a list of guaranteed service outputs. For the wider distinction between searchable text and extracted fields, use the searchable PDF and data extraction guide.

Describe the actual sheets before arranging handover

List the sizes already known, including unusually long sheets, rather than describing the collection only as “A1 plans”. Record whether sheets are stored flat, folded or rolled and note visible tears, attachments, repairs or areas that cannot be inspected safely. Do not force a sheet open or remove repairs to complete the enquiry. Ask the provider to assess suitability and any handling limits first.

Keep the collection's existing order and references visible in your brief. Identify which sheets belong to the same drawing set and where the set appears incomplete. If there is writing on the reverse, describe it and agree whether both sides are in scope.

Treat a revision label as information to record. The scanning supplier should not be expected to decide which drawing is current, approved or superseded from appearance alone. Assign those decisions to the drawing owner. The naming and indexing guide covers how to connect stable identifiers, filenames and descriptive fields.

Identify the details that must survive capture

Choose examples that show the information people actually need: a small drawing number, a faint dimension note, a colour-coded route, a revision table or a legend at the edge. State that the full sheet context matters, including the title block and any relevant border notes, rather than asking only for a close-up of the central drawing.

The National Archives of Australia's agency paper-digitisation guidance distinguishes documents with coloured elements or paper from those without colour. Its requirements are written for the agency contexts described there; they are not a universal specification for every commercial scanning job. For your brief, identify what colour communicates and ask for those distinctions to remain usable in the output.

Specify the required result before settling on a resolution number. Adobe's image-size and resampling explanation covers how an image's pixel dimensions, resolution setting and physical size relate. For a scanning brief, the practical point is that a resolution figure stored in a file, or pixels added by enlarging it later, does not show that faint linework was captured from the sheet.

Request representative output that lets the reviewer inspect those particular features. If a required detail is unclear when the reviewer zooms in, identify the affected feature and compare it with the source where possible. Avoid treating an attractive thumbnail or a large file size as the acceptance criterion.

Agree page dimensions separately from drawing scale

Record the supplied sheet size where known, the intended PDF page dimensions and whether any resizing is proposed. Keep that information separate from a scale label printed within the drawing. An old reduced copy can still show the scale label from the earlier version.

Printing adds another decision. Adobe's Acrobat page-sizing guidance explains that Fit resizes a page to the printable area, while Actual size does not scale it and can crop content that exceeds the paper. A printout that fits neatly on a smaller sheet does not, by itself, preserve the drawing's intended dimensions.

If a task depends on measurements, have the responsible technical reviewer define the suitable source, checks and permitted use. A scanning brief should record that requirement without promising that a readable PDF is verified measurement data. Likewise, digitisation does not establish whether an old drawing describes the building or asset as it exists today.

Separate searchable text from editable CAD

A scanned drawing is a raster image: a grid of pixels representing the sheet. OCR can be assessed for finding printed identifiers or notes, but recognising text does not reconstruct lines, layers or other design objects.

Autodesk's AutoCAD documentation on importing PDFs says that when a PDF contains only a raster scan, the import brings in the image and does not convert it into vector objects. That distinction explains why “PDF supplied” and “editable CAD supplied” should be separate requirements; it does not establish which software a scanning provider uses.

If editing is the goal, ask the drawing owner whether an authorised original CAD file is available before commissioning work from paper. Where conversion or reconstruction is proposed, agree its scope, reviewer and unresolved limitations separately. For searching a scanned set, specify a few relevant identifiers and how exceptions will be recorded, without assuming all small or handwritten text will be recognised.

A fictional drawing-set brief

This example is invented to illustrate scoping. It is not a customer project, tested result or service commitment.

A Sydney facilities coordinator has a group of printed layouts, including a sheet with red handwritten additions and two copies carrying different revision labels. The immediate task is to find and read the existing records in the team's document application; editing the design is outside that request.

The coordinator records the known sheet sizes and keeps both revision-labelled copies identifiable. They ask for the whole sheet, title block and coloured additions to be represented, and flag a folded sheet for handling assessment. The drawing owner will resolve revision status. A reviewer will compare the important notes in representative output before the wider scope is agreed.

This brief leaves decisions with the people who can make them: handling suitability with the provider, drawing status with the owner and intended technical use with the responsible reviewer.

Send a focused plan-scanning enquiry

An initial enquiry can describe the collection without attaching confidential drawings. Include:

• The approximate sheet count, known sizes and drawing groups, including unusually shaped or long sheets.
• Observed condition, storage form, attachments and any restrictions on handling or access.
• The identifiers, fine detail, colours and reverse-side information that matter.
• The intended application, file format, page dimensions and whether printing is required.
• Whether the request is for reference images, searchable identifiers or a separate design-data task.
• Who will resolve revision questions and review representative output, and which decisions remain open.

Pexatech's bulk scanning overview is a starting point for discussing the collection. Confirm suitability for the actual originals before arranging handover. Use PDF versus PDF/A for the separate format decision and the scanning quality checklist to plan delivery review once the scope is agreed.