How much does crawl space beam repair cost?
Beam repair in a crawl space can range from localized reinforcement to full replacement of a major load-bearing member. Angi's 2026 crawl-space repair guide lists beam replacement around $1,500 to $5,000 as a typical planning range, but difficult access, large beams, temporary shoring and related moisture damage can push the project higher.
When comparing bids, separate the beam itself from temporary support, posts or footings, joist work, moisture repair and finish restoration. Two proposals can use the same phrase “beam repair” while covering very different structural scopes.
What can make the price rise
- Beam size and length: larger structural members require more material and handling.
- Temporary shoring: the structure may need support while damaged material is removed.
- Access: low clearance, plumbing, ductwork or tight entry can increase labor.
- Moisture or rot: the repair may expand if nearby joists, sill plates or posts are also damaged.
- Support changes: additional posts, footings or piers may be needed if inadequate support caused the failure.
- Utilities and finishes: wiring, plumbing, insulation or finished flooring above can complicate the work.
Repair versus replacement
Not every damaged beam requires complete replacement. Depending on the material, damage and engineering requirements, a professional may discuss reinforcement, sistering, partial replacement or a new beam. The right method depends on the load, condition and cause of damage.
Ask the contractor to identify the exact damaged section and explain why the proposed method is appropriate rather than accepting a generic “replace beam” description.
Temporary shoring can be a major line item
Because a crawl-space beam can carry loads from floors and walls above, temporary posts or shoring may be needed before damaged material is removed. The layout and duration of temporary support can affect labor and access.
Ask whether shoring is included in the price and whether any jacking or floor correction is part of the same scope.
Posts and footings may be part of the problem
A damaged beam can be connected to inadequate, settled or deteriorated support posts. Replacing only the beam may not address the full load path if the supports below it are part of the failure.
If posts are being added or replaced, compare our crawl space support post cost guide. If foundation movement is also present, use crawl space foundation repair cost.
Moisture must be part of the conversation
If rot or mold developed because the crawl space stays damp, replacing the beam without correcting the moisture source can leave the new material exposed to the same conditions. Ask whether drainage, vapor control, encapsulation or dehumidification is part of the scope.
Our crawl space moisture repair cost guide, drainage cost guide and encapsulation cost guide separate those items from structural work.
How this relates to sagging floors
A damaged beam can allow floors above to dip, bounce or become uneven, but joists, posts and foundation supports can create similar symptoms. See our sagging floor repair cost guide for the broader set of causes.
If joists are damaged too, compare floor joist repair cost and joist sistering cost.
What a detailed beam proposal should show
- Beam material, approximate size and length.
- Repair, reinforcement or full replacement method.
- Temporary shoring and jacking.
- Posts, footings or piers included.
- Joist or sill-plate work included or excluded.
- Plumbing, electrical or ductwork relocations.
- Moisture-control work included or excluded.
- Permits, engineering and inspection.
- Cleanup and restoration.
Questions to ask a contractor
- Is the beam being repaired, reinforced or fully replaced?
- What caused the damage?
- Is temporary shoring included?
- Are posts, footings or joists also part of the repair?
- Will the floor be lifted or only stabilized?
- What moisture correction is needed to protect the new work?
- Are permits or engineering included in the quoted price?
- What happens if hidden rot is found after work begins?
How to compare two beam bids
Compare beam length, material, repair method, shoring, posts, joists, utilities, moisture control, engineering, cleanup and warranty. A lower total can simply mean the contractor is treating fewer parts of the load path.
2026 source notes
Angi's current crawl-space cost guide lists beam replacement in the low-thousands and notes that moisture, hidden deterioration and difficult access can significantly increase total project cost.
Angi crawl space repair cost guide · HomeAdvisor crawl space repair cost guide
Frequently asked questions
Does replacing a beam always fix a sagging floor?
No. Joists, posts, footings or foundation movement can also contribute.
Why is temporary shoring important?
It supports the structure while load-bearing material is being repaired or replaced.
Should moisture repair be separate?
Yes when moisture caused the damage, so the structural repair and prevention work are both clear.
Can a beam be reinforced instead of replaced?
Sometimes, depending on the damage, load and repair design. The appropriate method requires an on-site evaluation.
This article is educational. Structural beam work should be scoped on site by an appropriate qualified professional.