What a Complete Technical Package Includes
A complete technical package for a custom furniture order contains five document types: dimensioned 2D drawings, a 3D model file, a written material and finish specification, reference photos, and a named point of contact. A buyer who sends all five gets an accurate quote in 3-5 working days; a buyer who sends only a sketch can expect clarifying questions that add 1-2 weeks to the quotation stage. The package's only job is to remove ambiguity, because every guess a factory makes about your design becomes either a wrong quote or a wrong product. The sections below explain what each document should contain and what you can safely leave out.
This guide is written from the factory side of the table - we have reviewed hundreds of custom furniture RFQs, and the difference between a fast, accurate quote and a slow, vague one is almost always the quality of the technical package, not the complexity of the design. For the full path from drawings to container loading, our OEM process guide covers every stage; this article focuses specifically on the documentation you hand over at the start.
Start with 2D Drawings - The Minimum Baseline
The minimum a factory needs to build a custom outdoor furniture piece is a dimensioned 2D drawing: orthographic views (front, side, and top) with every dimension in millimeters, overall height and width, seat height, and structural thickness. A complete drawing set lets our engineers quote tooling and materials within 3-5 working days; a partial drawing forces a round of clarifying questions that typically adds 5-10 working days. Follow ISO 2768 general tolerances (linear +/-0.5mm for machined parts) so the factory knows exactly how precisely to cut. You do not need professional CAD training - a hand-drawn sketch with all dimensions marked in millimeters works for quotation, provided the numbers are complete and unambiguous.
Draw 2D views in one consistent unit (millimeters) and label every critical dimension rather than assuming the factory can infer it from a photo. If you only have a rendered product image, sketch over it and mark the six core seating dimensions before sending - a dimensioned overlay is worth more to the factory than a photorealistic render, because the factory programs cutting and bending equipment from numbers, not pixels.
3D Files - Which Formats Actually Help a Factory
A 3D model accelerates engineering review, but format matters more than file size - a STEP file of a typical dining chair is 5-20 MB and loads directly into cutting and welding programming. Send STEP (.stp) or IGES neutral files, or SolidWorks and Fusion 360 native files. Avoid sending only STL or OBJ mesh files: these describe a surface, not a manufacturable geometry, and force engineers to rebuild the part, adding 2-4 working days to the review. If you only have a rendered model, send it as a reference but pair it with a dimensioned 2D drawing, because a factory cannot program a CNC cutter from a render.
When you send both 2D and 3D files, mark which is the authority for production if they disagree. We flag any mismatch between the drawing and the model in our review rather than silently choosing one - which is exactly the behaviour you want, because the disagreement is normally a mistake in one of the two files. A clean, consistent file set is also what our drawing review and quoting workflow is built around.
Specify Every Material and Finish in Writing
A written material specification prevents the most expensive mistake in custom furniture: material substitution that changes price or durability after quoting. Write down the aluminum grade (we use 6063-T5, standard for outdoor frames) and minimum wall thickness (we build to 1.8mm and reject profiles below 1.75mm), the powder coat color as a RAL code, the rattan type (virgin HDPE with UV stabilizers), fabric grade (solution-dyed acrylic), and foam density in kg/m³ (28-32 kg/m³ for commercial seating). An ambiguous spec forces the factory to choose, and its choice may differ from your expectation - a 20% grade difference alone can change a quoted price by 10-15%. Write it down and both sides quote on the same product.
For color, name the RAL number rather than a color word: "anthracite" can mean five different finishes, but RAL 7016 is one powder coat. For fabric, name the brand, the grade, and the weight where it matters. Our materials page lists the grades we stock and can certify, and our private label branding guide covers how finishes carry into laser engraving, embroidery, and packaging when you are branding the product.
Add Reference Photos and Dimensioned Photos
Reference photos communicate style and proportion that drawings cannot, and a dimensioned photo set takes you only 30-45 minutes to shoot. Pair each reference with a note on what you want from it - "copy the arm profile, change the base to a sled style" - so the factory applies the right parts. Photos of an existing piece you want modified are the most useful: photograph it with a tape measure in frame, capturing overall height, seat height, arm height, and depth in millimeters. A dimensioned photo set saves a full round of clarifying questions, which typically shortens the quotation cycle by 3-7 working days. Sketches overlaid on photos are welcome and usually sufficient for quotation.
For a piece you are matching to an existing collection, include a photo of the adjacent furniture so we can judge proportion, not just the piece itself. If the furniture will be installed in a specific outdoor setting - a narrow pool deck, a windy rooftop - one wide shot of the space tells us constraints that a dimensioned drawing cannot, and lets our engineers flag stability or clearance issues before production.
How to Specify Custom Dimensions That Won't Get Misbuilt
Custom dimensions fail most often when they are incomplete, not when they are unusual, and six numbers cover most seating pieces: overall height, seat height, seat depth, arm height (or armless), overall width, and overall depth - all in millimeters. A standard commercial dining chair is 450mm seat height, a bar stool is 750mm, and a lounge chair seat is 380-420mm; stating the intended use lets our engineers sanity-check your numbers against ergonomic norms. When you modify an existing product, specify the change as a delta ("raise seat height 30mm from the standard 420mm") rather than a mystery absolute. Complete, use-case-anchored dimensions eliminate the largest source of rework, which our QC records show drives roughly 12% of custom-order change requests.
If you do not have exact numbers, say so and give us a target range plus a reference product to work from - we will propose the exact figures in the drawing review and confirm them with you before sampling. A stated range is far easier to engineer than a silent gap, and it keeps the quote honest about what will change once you lock the final numbers.
What Happens After You Send Your Package
Once your technical package lands with our R&D team, the review follows a fixed sequence: a 3-5 working day feasibility and cost review, a written quote with assumptions called out, then a 15-20 working day first-sample build if you proceed. Our 3-person engineering team works from a 300 m² sample room and flags risky details - thin wall sections, unstable proportions, or non-standard finishes - before production. You receive a quotation document listing price, MOQ, lead time, and the assumptions we made where your package was incomplete. A complete package typically compresses this cycle by 1-2 weeks versus one needing back-and-forth. We archive your approved sample for 5 years so reorders match at ΔE < 2.0 color tolerance.
Our factory tour guide maps where that review happens: the R&D sample room sits between the engineering office and the production floor, so a drawing issue found in review is corrected before any material is cut. The OEM process guide documents the same review sequence in the context of a full production run, and the MOQ negotiation guide covers how order size interacts with the tooling your drawings require.
Common Documentation Mistakes That Add Weeks to Your Lead Time
The five documentation mistakes that most reliably delay a custom furniture order are: no dimensions at all, mixing inches and millimeters, naming a brand without a grade, sending renders without 2D drawings, and changing the design after sampling starts. Each mistake triggers a clarification round; factories average 1-2 rounds per incomplete package, and each round costs 3-7 working days. In a 45-day production window, two clarification rounds can erase 25-30% of your schedule before the first part is cut. Preparing a complete package is free; the delay it prevents is not. Buyers who self-check against a checklist before sending cut total lead time by roughly 2-3 weeks across quote, sample, and production stages.
Two of these mistakes are purely commercial, not technical. "Similar to this product" invites the factory to quote a substitute design that you never approved, and a design change after sampling starts means re-quoting tooling and material - both are expensive for the buyer even when the factory handles them gracefully. Put the reference model and the frozen design in writing at the start, and treat any later change as a formal change order with a cost and timeline impact, exactly as the quality control checkpoints guide recommends.
The Complete Technical Package Checklist
Use this checklist before sending any technical package; a complete submission gets you a firmer quote and a shorter timeline than an incomplete one. Based on our review of hundreds of custom furniture RFQs, packages that include all five core documents receive quotes in 3-5 working days, while incomplete packages average 8-12 working days due to clarification rounds. The table below is what our engineers actually check when they open a submission - the same standard we apply to every OEM/ODM project, from a single modified chair to a 450-piece resort program.
| Document | What to include | Minimum acceptable |
|---|---|---|
| 2D drawings | Front / side / top views, all dimensions in mm, overall + seat + arm heights, ISO 2768 tolerance | Hand-drawn sketch with every dimension marked in millimeters |
| 3D model | STEP or IGES neutral file; SolidWorks / Fusion 360 native if available | None - but pair any render with dimensioned 2D drawings |
| Material & finish spec | Aluminum grade + wall thickness, RAL powder coat code, rattan type, fabric grade, foam density in kg/m³ | Name the grade for each material you know; flag unknowns as "propose" |
| Reference photos | Catalog shots with a note on what to copy; dimensioned photos of existing pieces | One clear photo with a tape measure in frame |
| Context | Intended use, climate, installation site, quantity, target timeline | Use case (dining / lounge / bar) and rough quantity |
Run every file through this list before you hit send. If a row is empty, either fill it or say explicitly "propose for me" - an honest gap that the factory fills within its engineering judgment beats a silent gap that gets filled by luck. That single habit removes most of the ambiguity that slows custom projects down.
Frequently asked questions about technical drawings for custom furniture
What CAD files do furniture factories actually need?
Factories need dimensioned 2D drawings (DXF, DWG, or PDF with all dimensions in millimeters) plus a 3D model in a neutral format such as STEP (.stp) or IGES. Native SolidWorks or Fusion 360 files are also acceptable. A STEP file of a typical dining chair is 5-20 MB and loads directly into cutting and welding programming. STL or OBJ mesh files are not manufacturable as-is and force engineers to rebuild the geometry, adding 2-4 working days to the review. If you only have a rendered model, send it as a reference but pair it with dimensioned 2D drawings.
Can I order custom furniture with just a sketch and photos?
Yes, for quotation purposes. A hand-drawn sketch with every dimension marked in millimeters, plus reference photos, is enough for a factory to quote in 3-5 working days. Before production starts you will need dimensioned drawings so the factory can program cutting and bending equipment. Photos of an existing piece you want modified - taken with a tape measure in frame - are the most useful form of reference and typically save a full clarification round, shortening the quotation cycle by 3-7 working days.
What dimensions must a custom chair or sofa drawing include?
For any seating piece you must state six numbers in millimeters: overall height, seat height, seat depth, arm height (or note armless), overall width, and overall depth. A standard commercial dining chair is 450mm seat height, a bar stool is 750mm, and a lounge chair seat is 380-420mm - stating the intended use lets engineers sanity-check your numbers against ergonomic norms. When modifying an existing product, specify the change as a delta (for example, raise seat height 30mm from the standard 420mm) rather than a single absolute number.
What is ISO 2768 and do I need to specify it?
ISO 2768 is the international standard for general geometric tolerances on drawings without individual tolerance callouts. For outdoor furniture machining, linear tolerances of +/-0.5mm are typical and achievable with standard CNC and laser cutting. You do not need to write ISO 2768 on your drawing - factories apply general tolerances by default - but specifying it (or stating a tighter tolerance like +/-0.2mm for critical joints) tells the factory exactly how precisely to cut, which affects both fit and quoted cost. We verify cutting to +/-0.5mm on our aluminum fabrication line.
How long does it take to review technical drawings and produce a sample?
A complete technical package gets a feasibility and cost review in 3-5 working days, followed by a written quote listing price, MOQ, lead time, and any assumptions where the package was incomplete. If you proceed, the first sample is typically built in 15-20 working days by our 3-person R&D team in a 300 m² sample room. An incomplete package adds 1-2 clarification rounds, each costing 3-7 working days, so a complete submission typically compresses the whole quote-to-sample cycle by 1-2 weeks.
Send Your Technical Package for a Firm Quote
A technical package is the cheapest insurance in custom furniture sourcing: it costs you a few hours of drawing and photography, and it buys you a quote that describes the same product the factory will build. The numbers in this guide - 3-5 working day reviews, 15-20 working day first samples, 1-2 clarification rounds per incomplete package - are the real operating figures behind our OEM/ODM service, and the checklist above is the exact standard our engineers apply when they open your submission. Buyers who arrive with a complete package consistently get firmer quotes, shorter timelines, and fewer change orders than buyers who arrive with a photo and a hope.
Next steps: Gather the five document types above and send them through our OEM/ODM page or directly to [email protected]. If any part of your design is still conceptual, send the reference photos and use case anyway - our R&D team will propose the missing numbers in the review. To start the process, request a custom quote with your project scope, or contact our project team to discuss drawing formats, MOQ, and sample timelines before you commit the design to paper.