Ask an entry door factory “what is your production capacity” and you will usually get a confident figure: so many door sets per month. The problem is not that the number is wrong — it is that, on its own, it tells you almost nothing about whether that factory can deliver your order on time. Capacity is not a fixed property of a building. It is the output of six connected variables, and unless you know the assumptions behind the figure, you cannot compare two factories or plan your own lead time.
Every factory’s throughput is built from the same physical ingredients. Look at each one instead of the headline number.
Capacity has three states. Normal output is what the line sustains day to day. Peak output is what it reaches at full utilization, often with overtime and deferred maintenance. Available capacity is what is left for your specific product mix in your required delivery month after existing commitments are subtracted. The nominal maximum is the least useful of the three for planning. The figure that protects your schedule is available capacity.
| Question | Why it changes the answer |
|---|---|
| Which product types are included? | “Entry door” spans steel, aluminum, wood and composite; each has a different line. |
| Does the “door set” include frame and hardware? | Changes the unit size, so two equal numbers may not be equal. |
| Is this one model or a mixed order? | Mixed orders run slower per unit than a single repeated model. |
| How many shifts and working days? | The same line at 1 shift is not the same as 3 shifts. |
| Where is the bottleneck? | The slowest station, not the building, sets the real rate. |
| How does customization cut output? | Non-standard sizes and finishes reduce daily throughput. |
| How much is already committed that month? | Nominal max minus booked orders equals what you can actually get. |
| Can they show recent records for a similar order? | Production and shipment logs beat a brochure number. |
Scale helps with standardized volume, but high-end entry doors are often custom. A modern entry door frequently calls for a non-standard opening, a specific powder-coat color and integrated smart hardware — work that a rigid high-volume line handles poorly. A capable factory keeps a flexible cell or sample workshop alongside the main line. Ask about minimum order quantity, sample lead time from drawing approval, and whether an oversized or shaped opening needs a new tooling fee. Scale and flexibility are not opposites, but you have to verify both.
Take ALPES as a concrete example of the kind of base worth evaluating. Its operation runs across a 100,000 m² manufacturing footprint with two production centers in Foshan and Zhaoqing, Guangdong, built around system aluminum products — thermal-break casement and sliding windows, sliding doors and sunrooms — using 6060-T66 profiles (1.8–2.5 mm), PA66GF25 multi-chamber thermal breaks and German-engineered hardware from ROTO, Winkhaus, CMECH and Wehag. That process maturity and scale are the right things to look for in any door supplier. For entry-door-specific line capacity, per-model output and lead times, confirm the current figures directly with the factory, since published catalogs change and a category page does not carry its own throughput number.
| Ask for | A good answer looks like | Red flag |
|---|---|---|
| Recent production records for a similar order | Dated photos, batch numbers, shipment logs | Only a round brochure number |
| Shift pattern and working days | Stated shifts and calendar days | “We work hard” with no detail |
| Committed load in your month | Honest “X% booked” or a slot date | “No problem, unlimited” |
| Custom opening policy | Clear MOQ, sample lead time, tooling fee | Vague or “no extra cost” with no limits |
| In-house processes | Named steps done on-site | “We assemble locally” only |
| Subcontract boundaries | Clear what is made vs bought | Refuses to say |
“What is the production capacity of an entry door factory” is the wrong first question. The useful question is: with my product mix, my finish, my sizes and my delivery month, how much of this factory’s capacity is actually available to me, and can they prove it with records? Whether the project is a china entry door for a single villa or a multi-unit development, the evaluation method stays the same. Ask for the six levers, separate normal from peak from available, and treat any single number without its assumptions as decoration. A factory that answers the eight questions with dated evidence is one you can plan around — regardless of how large the headline figure looks.
