Deck inspection, starting at the house
A proper deck inspection begins at the connection to the building and works outward, because that is where decks fail. We match you with local pros and tell you what a real report contains.
What is deck inspection?
A deck inspection is a structural assessment of an existing deck: the connection to the house, the footings and posts, the framing and its hardware, the guards, and the stairs. A useful one produces a written report you can act on, ranked by whether an item is dangerous now, deteriorating, or cosmetic. It usually takes an hour or two and most of it happens underneath the deck.
Signs you need deck inspection
- You are buying a house with a deck and want more than the paragraph a general home inspection gives it
- You are selling, and want to know what a buyer's inspector is going to find before they find it
- The deck came with the house and you have no idea whether it was ever permitted
- A storm, a fallen limb or heavy snow has loaded the deck unusually
- You are about to spend money on it and want to know whether to repair, resurface or replace
- You are planning to put something heavy on it - a hot tub, a large planter arrangement, an outdoor kitchen
- The deck is over about a couple of decades old and has never been looked at by anyone
- You are about to host a large gathering on an elevated deck
Seeing something not on this list? Browse decks problems by symptom →
How deck inspection actually works
The ledger, first and in detail
Where the deck meets the house, the inspector is looking at what the ledger is fastened to, what it is fastened with, whether it was flashed, and whether the house framing behind it is sound. This is checked first because a ledger failure takes the whole deck and everyone on it down at once, and because it is the defect a homeowner is least able to see.
Watch forAn inspection that never gets close to the house wall. If the report describes board condition and railing height but says nothing about the ledger, it has skipped the important part.
Underneath - footings, posts, beams, joists, hardware
The inspector goes under, or lifts boards if there is no access. They are probing for soft timber at joist ends and post bases, looking at how posts meet their footings, checking that the structural connectors are present, correct and not corroded, and looking for any sign the structure has moved.
Watch forA report written from the top of the deck. Almost nothing that makes a deck unsafe is visible from up there.
Guards and stairs, tested rather than measured
Guards get pushed. Stairs get walked and their step heights compared. Both are checked against what your jurisdiction requires, which matters more than what looks normal - and both are where an old deck is most likely to be non-compliant, because requirements have tightened over the decades.
Watch forAn inspector who measures the guard height and never leans on it. Height is the easy half; whether the posts are anchored to anything is the half that matters.
The permit history question
A good inspector will ask, or check, whether the deck was ever permitted. An unpermitted deck is not automatically unsafe, but it means the structure has never been independently checked, and it is a live issue at resale and potentially at claim time.
Watch forThis being skipped. It is a public record in most places and it changes what the rest of the report means.
A written report, ranked by consequence
You want findings sorted into what makes the deck unsafe to use now, what will within a season or two, and what is cosmetic - with photographs. That structure is what lets you spend sensibly instead of doing everything or nothing.
Watch forA verbal summary and a quote. Those are two different documents and you are paying for the first one.
What does deck inspection cost?
A standalone deck inspection is commonly $150 to $500, depending on size, access and whether a written report with photographs is included. Free inspections offered by companies that build decks are a sales visit; useful, sometimes, but not the same product.
See the full deck inspection cost guide - by material, size and region →
If the number is the problem, here are the ways people pay for it →
HomeMatchup does not perform deck inspection. We match you with licensed local decks pros for deck inspection. Free for homeowners — Get matched free · how we verify pros.
When deck inspection is the wrong call
When saying yes is the wrong move:
- You have already decided to replace the deck. Paying to be told a structure you are demolishing has problems is money you could put into the rebuild. Skip to a builder's assessment.
- The deck is visibly failing. If posts are rotted through, the deck has separated from the house, or it moves when you walk on it, you do not need a report to tell you to stop using it. Fence it off and get a builder.
- The "inspection" is free and offered by a company that sells decks. Not worthless, but understand what it is. Somebody whose income depends on the answer is not the person to settle a repair-or-replace question. Pay for an independent opinion if the number is large.
- The deck is brand new and was permitted and inspected. It has just had a structural inspection by a building official with no financial interest. A second one within the warranty period rarely tells you anything new.
- You want an inspection instead of a permit. They are not substitutes. An inspection tells you the condition of what exists; a permit and its inspections govern what is being built. An unpermitted deck with a clean inspection report is still unpermitted on the property record.
- Nobody can physically get under it. A very low or fully enclosed deck cannot be properly inspected without lifting boards. An inspector who reports on it anyway is reporting on what they could see, which is the surface.
What to check when hiring for deck inspection
- Will you get underneath the deck, and lift boards if you cannot? If the answer is no, you are buying an opinion about the boards, not an assessment of the structure.
- What will you tell me about the ledger connection specifically? The defining question. An inspector who cannot describe what they look for at the ledger is not the right inspector.
- Do you sell or perform deck repairs? Not disqualifying, but you are entitled to know. If they do, weigh the recommendations accordingly, or get a second opinion before a large spend.
- Do I get a written report with photographs? A report you can hand to three builders for comparable quotes is worth several times a verbal summary.
- Will findings be ranked by urgency? Unranked findings force you to treat a splintered board and a failing ledger as the same decision.
- Will you check whether the deck was permitted? It is usually a public record, it takes minutes, and it changes what an absence of prior inspection means.
Deck Inspection near you
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Sources
Sources last checked
- Treated Wood — consumer safetyU.S. Environmental Protection AgencyRetrieved 2026-08-04Preservative-treated lumber context for outdoor structures.
- Occupational Employment and Wages — Construction TradesU.S. Bureau of Labor StatisticsRetrieved 2026-08-04Labor cost context for home-services trades nationally.
Sources for figures and claims on this page.
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