Dormer crane work and access

Short answer

Prefab dormers are usually lifted by crane. The crane needs space, level ground, and often a street permit. If access is tight, alternatives exist but they change the cost and schedule.

When a crane is needed

A crane lifts the prefab dormer box, windows, and sometimes materials onto the roof. Traditional builds may also use a crane for heavy beams or tiles.

• Prefab dormer — almost always needs a crane.
• Traditional build — may need one for heavy materials or high roofs.
• High or steep roofs — a crane reduces manual handling and risk.

Access requirements

The crane company needs to know the reach, the weight of the lift, and the ground conditions. A site visit is usually needed.

• Clear space for the crane body and outriggers.
• No overhead power lines in the lifting zone.
• Level, firm ground — a crane cannot sit on soft ground without mats.
• A clear route from the road to the lifting point.

Permits and notices

• Street parking suspension.
• Temporary road closure or traffic management.
• Notice to neighbours or shared driveway users.
• Insurance cover for public liability during the lift.

Alternatives

If a full-size crane will not fit, the company may use a compact spider crane, a telehandler, or build the dormer on site. Each option affects cost and duration.

The full checklist

FAQ