How Site Access Affects Modular Delivery

Most people think the question is 'does my yard have room for a 20 ft module.' It almost always does. The real question is whether a truck carrying that module, and a crane big enough to set it, can get from the public road to the placement point. Access, not square footage, is what actually constrains a modular build.

The approach path, in order

1. 01Public road — width, traffic, and whether a delivery truck can legally and safely stop or stage there.
2. 02Driveway entrance — the width and angle where the driveway meets the road, often the tightest turn on the whole route.
3. 03Driveway run — length, width, surface, grade and any obstructions along the way.
4. 04Staging area — a flat, stable space near the placement point where the truck can park and the crane can set up.
5. 05Placement — the final spot, and the reach the crane needs to get the module from the staging area onto its pad or foundation.

Every one of those five links has to work. A generous driveway and a perfect building pad don't matter if the entrance off the road is a tight 90-degree turn between two stone walls.

Driveway width and why the truck needs more than the module's width

A TRAIN 20 module is about 8 ft wide. The truck carrying it is wider than that once you account for mirrors, the trailer bed, and the working clearance a driver needs on each side to avoid tree branches, fence posts and parked cars. A driveway that looks fine for a car and a delivery van can still be too tight for a flatbed carrying an 8 ft-wide load. Overhanging brush counts as an obstruction even if it would never bother a sedan.

Turning radius: a 40 ft load is a different geometry problem than a 20 ft load

A straight driveway is easy regardless of module length. A 90-degree turn is not. A 40 ft module on a trailer has a much longer effective wheelbase than a 20 ft module, and it needs a wider arc to complete the same turn. A driveway entrance that a TRAIN 20 delivery can negotiate in one pass might require a TRAIN 40 delivery to back up and re-approach, or might not be workable for a 40 ft load at all without an alternate route or a shorter module.

Overhead obstructions — the most commonly missed problem

People measure width and forget height. Utility lines crossing the driveway, low tree canopy, a gate or archway, an overhang at the garage — all of these get missed in a walk-through because nobody looks up. A loaded module on a trailer sits high enough that a line or branch that clears a moving truck can still catch a module riding on top of it. Overhead clearance should be checked the entire length of the approach, not just at the obvious pinch points.

Grade, soft ground and buried risk

A loaded delivery truck and a crane outrigger both put significant point loads into the ground. Steep grade or cross-slope makes a truck harder to control and a crane harder to level. Soft ground — wet lawn, uncompacted fill, anything that wasn't built to carry heavy equipment — can rut or fail under that load. Septic fields, leach fields, culverts and buried utility lines are all crush risks: driving or setting up on top of them can cause real damage that isn't visible until later. These need to be identified and routed around, not driven over and hoped for.

The staging area needs its own space

The truck and the crane are not the same machine and they don't share the same footprint. The truck needs room to park and, ideally, to pull through rather than reverse out. The crane needs a separate, stable, level area to set up its outriggers — and that area has to be positioned so the crane can actually reach the placement point once the module is unloaded. On tight lots, finding room for both at once, without one blocking the other, is often the real design puzzle.

Crane placement and the physics of reach

A crane picks a load from where it's staged and swings or extends it to the placement point. Reach isn't free: the farther the module has to travel from the crane to its final position, the less weight the crane can safely lift at that distance, which means a longer reach calls for a bigger machine. A bigger machine needs more setup room, more stable ground, and sometimes a different access route just to get itself on site. This is why a placement point 20 ft farther from the driveway than expected can change the entire plan — it's not a small tweak, it's a different crane class and a different staging footprint.

  PUBLIC ROAD
      │
      ▼  driveway entrance (tightest turn)
  ┌───────────────────────────────┐
  │        driveway run           │
  └───────────────────────────────┘
      │
      ▼
  ┌───────────┐        reach       ┌───────────┐
  │  STAGING  │ ─────────────────▶ │ PLACEMENT │
  │  (truck + │   crane must span  │   POINT   │
  │  crane)   │   this distance    │           │
  └───────────┘                    └───────────┘

A difficult site is a planning problem, not a no. But it has to be planned before the truck leaves the yard, not discovered when it's halfway up the driveway.

Seasonal reality in the Northeast

• Frost can heave and crack a driveway surface that looked stable in fall.
• Mud season (typically a stretch in early spring here) turns unpaved driveways and lawns soft enough to rut under light vehicles, let alone a loaded truck.
• Snow storage areas often occupy exactly the flat open space a crane would want to stage in during winter.
• Winter access — plowing, ice, shortened daylight — affects when a delivery and set can happen at all, independent of the site's summer condition.

A self-assessment checklist

Walk the route with a tape measure and answer these honestly:

• What is the narrowest width along the entire driveway, measured at the tightest pinch point, not the average?
• What is the lowest overhead clearance anywhere along that same route?
• Is there a 90-degree or sharper turn anywhere between the road and the placement point?
• Is the ground along the route and at the staging area firm, level, and free of visible soft spots?
• Are there septic components, a leach field, a well, or buried utility lines anywhere near the route or staging area?
• Is there a flat area near the placement point large enough for a crane to set up separately from where the truck parks?
• How far is the placement point from the nearest spot a crane could realistically stage?

What we measure, and why

What to photograph before a site check

• The driveway entrance from the road, showing the full turn angle.
• The full length of the driveway, including any narrow or overhung sections.
• Anything overhead near the driveway and near the placement point — wires, branches, eaves.
• The intended placement point and a wide shot of the surrounding open space.
• Any visible septic covers, well caps, culverts or utility markers near the route.