Pick the form
Volumetric modular construction finishes more work off site and then has to fit the road and the crane. Panelized construction packs flatter and leaves more assembly in the weather.
Plain-language format guide
KeystoneSource Sourcing Format and Quote Scope Guide
KeystoneSource Sourcing wrote this guide for buyers who searched Guerdon and now need to compare other modular formats. It explains volumetric boxes, panelized kits, and the scope words that make two prices incomparable. The desk does not claim authorized dealer status and does not offer the named brand’s buildings.
This is a comparison aid for alternative products, not a line card from the referenced company.
A decision path, read left to right
Pick the repeat
A standardized unit is easier to compare when the project fits published module dimensions. A custom plan fits an odd site and needs its own engineering.
Pick the scope
A shell price leaves foundation, utilities, and set with the buyer. A turnkey ask still needs every exclusion written, or the larger number is not a larger building.
Pick the evidence
Ask which drawing, load case, and plant the number belongs to. Accept an alternative only after those three match the project.
Open choices, grouped so they stay visible
Format
Transport stateFinished box, flat panels, or a folded package. Write the transport envelope.
Site work leftMating lines and a crane lift plan for a box. More weather exposure for panels.
Structure wordsPrimary frame, secondary framing, purlin, and girt only if that system uses them.
Performance the project must name
ClimateInsulation as R-value or thermal transmittance, plus the climate the number assumes.
FireFire-resistance rating only for the assembly the authority asked about.
LoadsDesign live load, design dead load, wind speed, ground snow load, seismic design category.
Commercial scope
Quantity basisModules or buildings, and whether the budget is per unit or the whole project.
DestinationA place a truck can reach, plus who receives it.
PreferenceHigh-end, mid-range, budget, or undecided. A buyer preference, not a verified rating.
Questions still open before you accept an alternative
No. A modular building under a state program, a dwelling under the IRC, and a manufactured home under the HUD Code are different filings. An alternative supplier must say which path its documents follow for your jurisdiction. Matching a photo is not that statement.
When the span, the snow case, the seismic design category, or the foundation interface falls outside the published option list. Forcing a standard box onto that site hides engineering that a custom package would show. The comparison should mark the deviation instead of averaging it away.
The manufacturer named on the quotation, the drawings for that system, the material and coating, the exclusions, and the delivery basis. AISC 360 or AWS D1.1 matters only if the supplier’s own documents say the work was done to that reference. ISO 9001 or IAS AC472, if mentioned, must be tied to the plant in the bid, not to this website.
Send the open choices with the brief
- Format still undecided, or already narrowed to a box or a kit
- Scope still undecided, or already narrowed to shell or a wider set
- Loads known, or marked unknown on purpose
- Quantity, destination, and timing written in one place