How long does a house structure last

The structure of a house is the layer you will almost certainly never replace. Foundations run 80 to 150 years, the load-bearing frame above them 80 to 200, and both routinely outlast the people who own the house. That single fact reframes most structural worry: this is not a maintenance cycle you budget for, it is a rare-event you watch for.

What each part of the structure lasts

Part	Typical lifespan	What usually ends it
Concrete slab foundation	80–120 years	settlement, water ingress, cracking from soil movement
Strip footing	100–150 years	settlement, frost heave, cracking
Pile foundation	80–100 years	pile rot (timber), corrosion (steel), groundwater drop
Masonry structure (brick/stone)	100–200 years	mortar degradation, spalling, settlement cracks
Timber frame	80–120 years	rot from moisture, insect damage, joint loosening
Reinforced concrete frame	80–120 years	rebar corrosion, alkali-silica reaction, cracking
Steel frame	80–120 years	corrosion, fatigue at connections, fire damage

These ranges come from the durability handbooks and structural-engineering data behind the planning model. The pattern is the point: every number here is measured in lifetimes, not decades. When people say a house is “a hundred years old and solid,” this table is why; the covering and the services were replaced several times over, and the bones were left alone.

Why the structure is not a maintenance line

Most components in a house sit on a replacement clock you can plan around. The structure does not work that way, and it is the clearest case of the four maintenance roles: it is expert-triggered, not scheduled. You do not set aside money each year toward replacing a foundation the way you do for a boiler or a roof covering. Instead the structure is watched, and it announces a genuine problem rarely and specifically. That is why appkeep treats the structure as a passport entry rather than a projected cost: recording what it is, so the next owner inherits the knowledge, without pretending it needs an annual budget it does not.

The warning signs that are real

The hard part is telling cosmetic settlement, which is common and harmless, from movement, which is not. Fresh plaster cracks in a new-build settling, or fine stable cracks in an old wall, are usually nothing. The signs that warrant a specialist are different in kind: cracks that widen over months, cracks wider than roughly 5 mm, cracks stepping diagonally through brickwork, and cracks that arrive alongside doors that jam and floors that slope. Any of those is a structural-engineer question, because the consequential damage from real movement compounds and the diagnosis needs equipment and training a homeowner does not have.

When to bring someone in

Lars’s house outside Gothenburg is a 1930s brick structure, more than ninety years old in brickwork that can stand for two centuries, and a stepped crack has appeared above a ground-floor window. He does not price a repair, because he does not yet know what the repair is; a crack is a symptom, and the cause could be a blocked gutter soaking one corner or genuine foundation movement. He books a structural engineer for a single diagnostic visit. That read is the whole decision: it either buys years of peace of mind or catches the one problem where acting early matters most. The version of this that goes wrong is the one where someone prices a fix before anyone has diagnosed the cause.

What this means before you call anyone

The structure is the one part of the house where the first spend should be a diagnosis, not a repair. Because it lasts lifetimes, a real structural problem is rare, and because it is rare, guessing at it is expensive in both directions: over-reacting to a cosmetic crack, or under-reacting to a moving one. The when-to-hire-a-building-inspector guide covers who to call and what a structural read should tell you. In appkeep the structure lives in your property’s record as what it is and how old, so the day a crack appears you already know what you are looking at.