Restumping, Reblocking and Underpinning: What's the Difference?

The short answer, because it’s the reason most people land here:

Restumping and reblocking are the same job. Two words, one piece of work. Reblocking is the older Victorian term.
Underpinning is a different job entirely. It deals with footings and the ground, not the posts a floor sits on.
Relevelling and house levelling describe an outcome, not a method. Any of the above can achieve it.
Jack and pack is a specific method — and the cheapest one.

That’s the whole answer. The rest of this page explains why the distinction matters when you’re holding two quotes that appear to be for different things and aren’t — or appear to be for the same thing and aren’t.

Restumping and reblocking: same job, two words

A house with a suspended timber floor sits on a grid of posts. Floorboards on joists, joists on bearers, bearers on posts, posts in the ground. Replacing those posts is the job.

In Victoria it has two names. Restumping is the more common term now. Reblocking is the older one, and it comes from “blocks” — what the posts were called in Victoria before “stumps” became standard usage. [[VERIFY — this etymology is widely repeated in the trade but source it before publishing as fact, or soften to “the term is generally understood to come from…”]]

Some operators use one word, some the other, some both. There is no technical distinction. If you get one quote for restumping and one for reblocking, you are looking at quotes for the same work and you can compare them directly.

Worth knowing: “reblocking” is distinctively Victorian. It has real search volume here and very little interstate, which is why sites run from outside Victoria targeting Victorian towns tend to ignore the word entirely. If a company servicing Bendigo never uses it, that’s a small signal about where they’re actually based.

What restumping involves, and what it costs in Bendigo →

Restumping vs underpinning: genuinely different jobs

This is the distinction that costs people money when they get it wrong, because the price gap runs into tens of thousands.

	Restumping / reblocking	Underpinning
What’s replaced	The stumps — the posts holding up a suspended floor	Nothing is replaced. The existing footing is extended or supported deeper
What’s wrong	The posts have rotted, split, sunk or been eaten out	The ground won’t carry the load evenly
House types	Timber-floored houses on stumps	Brick on strip footings, and slab-on-ground homes
Possible on a slab home?	No — there are no stumps	Yes — it’s the only structural option
Typical cost	Around $280 – $550 per stump; $12,000 – $30,000 for a full house	Around $1,200 – $2,500 per pier; $15,000 – $40,000+ whole house
Engineering	Sometimes	Effectively always — pier design comes from an engineer

The plain version: restumping fixes what’s standing on the ground. Underpinning fixes the ground.

Which means a house can need both, one, or neither — and it’s entirely possible for the stumps to be perfectly sound while the house is still moving. Underpinning in Bendigo →

Levelling, relevelling and jack and pack: where they fit

Here’s where most of the confusion actually comes from. Some of these words describe a job, and some describe a result. They get used interchangeably and they shouldn’t be.

House levelling and relevelling are results. The floor isn’t level and the goal is to bring it back. That’s the outcome, not the method. Restumping can achieve it. Jack and pack can achieve it. Underpinning can achieve it. Which one applies depends on why the floor went out of level.

So a quote for “relevelling” hasn’t told you what work is being done. It’s a legitimate term, but it needs a method attached to it before it means anything.

Jack and pack is a method, and a specific one. The house is jacked up and packing is inserted between the existing stump tops and the bearers. Nothing is dug out, nothing is replaced. It only works where the stumps are already sound and the ground is stable — but where those conditions hold, it costs a fraction of the alternatives.

It’s also the one most likely to go unmentioned, because it’s a small job with limited margin. When jack and pack works, and when it doesn’t →

Every term you'll hear, in one place

Term	Job or outcome	What it means
Restumping	Job	Replacing the stumps under a suspended timber floor
Reblocking	Job	The same job. Older Victorian term
Underpinning	Job	Extending or supporting footings down to ground that will carry the load
Jack and pack	Job	Lifting the house and packing on top of existing sound stumps
House levelling	Outcome	Getting the floors level, by whichever method suits
Relevelling	Outcome	Same as above. Usually implies it was levelled before
Subfloor repairs	Job	Bearers, joists, ventilation and damp — the layer between stumps and floorboards
Stumps / blocks	—	The posts. Timber, concrete or galvanised steel
Bearers	—	Horizontal timbers sitting on the stumps
Joists	—	Timbers sitting across the bearers, carrying the floorboards
Piers	—	What underpinning installs. Not the same as stumps
Screw piles	—	Steel piles screwed down to load-bearing strata. An underpinning method
Resin injection	—	Structural resin injected to consolidate soil. An underpinning method
Mass concrete underpinning	—	Excavating beneath the footing in stages and filling with concrete
Site classification	—	How reactive the ground is, under AS 2870. A to E, plus P for problem sites
Class P	—	A problem site. Standard footing design doesn’t apply; an engineer must design specifically

Why this costs people money

Three specific ways the terminology trips people up.

1. Comparing quotes that aren’t comparable. If one quote says restumping and another says underpinning, those are quotes for different work — and at least one of the two has diagnosed your house differently. The gap between them isn’t a price difference to negotiate. It’s a disagreement about what’s wrong, and you need to resolve that before you compare dollars.

2. Assuming reblocking is cheaper. It isn’t a lesser version of restumping. It’s the same job under an older name. If one quote is materially cheaper, the reason is scope, stump count, materials or exclusions — not the word on the letterhead.

3. Accepting “relevelling” without a method. A relevelling quote could mean jack and pack at a few thousand dollars, or a full restump at twenty-five. Both are honestly described as relevelling. Ask which method, and ask why that one.

The useful question in every case isn’t “what’s this called”. It’s “what do you think is causing the movement, and how did you establish that”. Terminology follows from the diagnosis. The nine questions to ask every quote →

Which one applies to your house?

A rough path. Not a substitute for someone measuring floor levels, but enough to know which conversation you’re having.

Is it a slab-on-ground house? If yes, restumping, reblocking and jack and pack are all impossible — there are no stumps. The conversation is underpinning or slab repair. Most Bendigo housing built from roughly the 1980s onward falls here: Maiden Gully, Epsom, Strathdale, Junortoun, Strathfieldsaye, Huntly, Marong.
Does it have a timber floor on stumps? All options are live. Gold-era and post-war Bendigo housing — Long Gully, Golden Square, Quarry Hill, Ironbark, Eaglehawk, Flora Hill, Kennington.
Are the stumps sound? Only findable by getting under the house. Sound stumps plus a settled house points to jack and pack. Failed stumps points to restumping.
Is the movement seasonal or one-way? Cracks that open in summer and close after a wet winter suggest reactive clay, and the first fix is usually drainage rather than structural work. Movement that only ever goes one direction suggests stumps or ground.
Are the stumps sound and the house still moving? That’s a ground problem. Underpinning.

In Bendigo there’s a fourth possibility that doesn’t exist in most cities: subsidence over historic mine workings. Reactive clay above, old workings below, and both produce the same sloping floors. Why Bendigo ground moves →

All four methods compared with costs: house levelling in Bendigo.

Still not sure which one you need?

That’s the normal position, and it’s the point of an assessment. Five questions — what you’re seeing, what the house sits on, roughly when it was built, why you’re looking into it now, and how to reach you.