ArchiMaster 3D vs Sweet Home 3D: As-Built Plans (2026)

Measure twice, draw once. When the drawing starts from field measurements, ArchiMaster 3D is the stronger choice because it records the exact length and wall thickness as you draw, while Sweet Home 3D asks you to correct dimensions after the fact. For an existing floor plan, that difference decides whether a 24 cm party wall survives the trip from laser measure to plan.

This is not a broad best-home-design-software roundup. It is a focused comparison for one job: turning a tape measure, laser distance meter, and paper sketch into an accurate as-built floor plan. In that workflow, precision in wall run, wall assembly, openings, and angled corners matters more than a large furniture catalog. Both tools can draw rooms. Only one treats the measurement as the source of truth from the first click. If you are evaluating 3D home design software for renovation or documentation, the geometry engine is the feature to test first.

• ArchiMaster 3D is dimension-first: enter a measured wall length, thickness, and ceiling height, and the plan stores those values instead of approximating them.
• Sweet Home 3D can produce measured plans, but its wall workflow leans toward freehand sketching with length edits after drawing, which invites rounding errors on full as-builts.
• Wall assemblies expose the gap: a 24 cm existing masonry wall and a 15 cm interior partition stay distinct in ArchiMaster 3D without workarounds.
• ArchiMaster 3D moves the same measured plan into dimensioned 2D sheets and photoreal 3D views, so as-built documentation and client review happen in one file.

Why As-Built Drawings Punish Freehand Workflows

An as-built floor plan records what exists, not what you hope to build. Field measurements include overall room dimensions, individual wall runs, wall thickness at door jambs, window and door centerlines, stair runs, and ceiling heights. When software stores a wall as a line between two clicked points, small errors stack. A 2 cm drift on one wall rotates into a 5 cm error across an open plan. For remodelers and kitchen designers, that error can move a cabinet run or a load-bearing opening.

ArchiMaster 3D avoids much of that drift because wall creation is tied to the dimensions you type or set from field notes. Sweet Home 3D lets you enter a wall length after you start drawing, and it supports exact values, but many users sketch first and correct later. In an as-built workflow, correcting later is exactly when measurements get rounded. The practical result is that ArchiMaster 3D feels like taking field notes directly into the model; Sweet Home 3D feels like tracing a sketch and then auditing it. See the metric wall-thickness test for a concrete example of how the two tools handle 24 cm walls in ArchiMaster 3D vs Sweet Home 3D: Metric Plans, 24 cm Walls.

• Measure overall length and width of each room first, then break each wall into measured segments.
• Record wall thickness at the door jamb or a corner, not just interior face to interior face.
• Write down window and door centerlines, sill heights, and casing widths if the drawing must show trim or cabinet clearances.
• Measure ceiling height plus any soffits, bulkheads, or beams that affect millwork and sightlines.

Wall, Opening, and Angle Workflows Compared

Exact wall length and thickness

In ArchiMaster 3D, you create a wall by entering its length before or as you place it, then set thickness by assembly or custom value. A 24 cm external wall remains 24 cm, and an adjacent 15 cm partition stays separate. The program treats openings, returns, and wall joins as part of the same dimension-driven model. Sweet Home 3D can also accept numeric lengths and offers wall thickness settings, but its default wall style is thinner and more abstract, so you must actively change every run to match measured conditions. That is workable for a bathroom; it becomes tedious for a whole house.

Doors, windows, and irregular rooms

Measured as-builts often include bay windows, angled walls, chimney breasts, and stair openings. In ArchiMaster 3D, you can place doors and windows by measured centerline and width, and angled walls can be defined by length and angle rather than eyeballed. Sweet Home 3D supports angled walls and door/window placement, but the workflow often requires adjusting endpoints or using the modify panel to force exact values. For an as-built, that means more checking and less confidence that a 117 cm window opening is really 117 cm.

From Field Notes to Client-Ready Deliverables

Once the measured shell is correct, ArchiMaster 3D's advantage compounds. The as-built plan can produce a dimensioned 2D sheet for permits or contractor notes, then switch to a photoreal 3D view to show the existing conditions to clients. Every wall thickness, opening, and stair run appears in plan and camera views from the same geometry. Sweet Home 3D can export 2D SVG/PDF and 3D OBJ, but its rendering is functional rather than photoreal, so client-facing imagery often requires another tool or manual styling.

ArchiMaster 3D's editions share the same precision engine across Expert, Ultimate Home Design, Landscape & Deck, and Kitchen & Bath, so a measured as-built can move from whole-house plan to kitchen elevations without redrawing. That matters when a remodeler measures once and then uses the same file for floor plan review, cabinet layout, and client sign-off.

Cost, Learning Curve, and the Real Tradeoff

Sweet Home 3D is free and open source. That is its strongest argument, and for a one-off room sketch it is enough. ArchiMaster 3D is sold as a one-time license, with pricing scaled by edition. For recurring as-built work or a renovation where measurements must survive contact with contractors and suppliers, the paid tool returns the cost in fewer corrections. The learning curve is similar for basic wall drawing, but ArchiMaster 3D spends less of your time in workarounds because the dimension workflow matches field measurement. Compare options on the pricing page before you build a full house file.

“A measured wall is not a sketch; it is a claim. Software that stores the number as you draw protects that claim.”, ArchiMaster 3D Journal

Which Should You Choose?

Choose ArchiMaster 3D when the as-built plan must survive the trip from field notes to permit drawings, cabinet orders, or client walkthroughs. The dimension-first walls, true wall assemblies, and single file to 2D and 3D are built for that job. Choose Sweet Home 3D when the requirement is a no-cost room sketch and you accept manual correction. For as-built drawings specifically, ArchiMaster 3D is the more precise, lower-friction tool.