Crown reduction makes a tree smaller while keeping its natural shape, by shortening branches back to suitable growing points. Pollarding is a deliberate, repeating system: the top of a young tree is cut at a chosen height, and the regrowth is cut back to that same point every few years for the rest of the tree's life. Topping is neither. It is cutting the top out of a mature tree at whatever height suits the operator, leaving large stubs. The Arboricultural Association calls topping and lopping outdated terminology for crude, inappropriate pruning, and a quote that describes one thing but prices the other is the single most common problem in domestic tree work.
Crown reduction
A crown reduction reduces the height and spread of the crown while keeping the main branch framework, so the tree still looks like the species it is. Each branch is shortened back to a side branch big enough to take over as the new leader, rather than cut to a blank stub.
Two numbers matter. The Arboricultural Association says reduction cuts should be as small as possible and generally not more than 100mm in diameter, and that the final cut should not exceed one third of the diameter of the parent branch or stem, following BS 3998:2010 (AA guide to tree pruning). Small cuts to living growing points seal faster.
A reduction is specified in metres, not percentages: "reduce height by 2m and lateral spread by 1.5m" is a proper instruction. Afterwards the tree looks tighter and shorter but recognisably itself, and regrowth comes from the retained side branches as normal, controlled growth. Most garden trees hold a reduction for three to five years.
Crown lifting and crown thinning
Two related jobs are often confused with reduction, and both are cheaper.
Crown lifting removes the lowest branches to get light and headroom underneath, and is specified as a clearance height above ground. The Arboricultural Association says it should be restricted to less than 15% of the live crown height and should leave the crown at least two thirds of the total height of the tree.
Crown thinning takes out a proportion of the smaller secondary branches evenly through the crown to let more light through, without changing the tree's height or outline. The association's guidance is that thinning should not exceed 30% overall. If someone offers to "thin" a tree and the outline gets smaller, that was a reduction, or worse.
If your problem is a dark window or a low branch over the car, a lift or a thin usually solves it for less.
Pollarding
Pollarding is a management system rather than a one-off job. The top of a young tree is cut at a set height to force multiple shoots from that point, and from then on the regrowth is cut back to the same swollen pollard head on a cycle. The Arboricultural Association's definition is explicit that once started, it should be repeated cyclically, always retaining the initial pollard point.
It works because some species regrow reliably from old wood. The RHS lists ash, common lime, elm, elder, London plane, mulberry, oak, tulip tree and some maples (RHS: pollarding); limes, planes and willows are the ones you see pollarded in British streets. Cycles vary with species and how big you let the regrowth get: willows are often cut every two to four years, limes and planes every three to six. The RHS advises late winter or early spring, with maples cut in summer instead because they bleed sap in spring.
Two warnings. Pollarding a large mature tree that has never been pollarded is not the same thing and leaves big wounds in old wood, which is where pollarding shades into topping. And once started, a pollard has to be kept up: the RHS notes that on weak-wooded species such as poplar and willow the regrowth can become hazardous, and that lapsed pollards on beech, oak and sweet chestnut build heavy limbs that may fail in wind. See our pollarding page.
Topping, and why it costs more in the end
Topping means removing large portions of the crown, cutting through the main stems at a convenient height with no regard for where the next growing point is. What it leaves behind is a set of stubs, and four things follow:
- Large wounds. The Arboricultural Association warns that removing a large diameter branch increases the risk of disease entering the wound, and that fungi and bacteria entering that way can decay the woody structure of the tree. A stub with no living growth beyond it has no reason to seal and no energy to defend itself.
- Decay into the main stems. The cuts are through structural wood rather than out at the edge of the crown, so any decay that starts is working on the parts holding the tree up.
- Weak epicormic regrowth. The tree responds to losing its foliage by pushing out a dense mass of shoots from dormant buds just below the cuts. These grow fast, but they are attached to the outer layers of a decaying stub rather than anchored into the branch structure. Ten years on you have a taller, heavier crown on weaker attachments than before.
- Higher long-term cost. The regrowth returns within a few seasons, so the job comes round sooner. Eventually the choice is repeated cutting or removal of a tree that was healthy before it was topped.
Topping is also legally risky on a protected tree: a Tree Preservation Order expressly covers topping and lopping. See do I need permission to cut down a tree.
How to spot a quote that is really topping
- The wording is vague: "cut back", "take the top off", "reduce by half", "tidy up". A reduction quote names the tree and the metres coming off.
- The price is far below everyone else for a big tree. Topping is quick, which is why it is cheap.
- Nobody mentions BS 3998, growing points or where the cuts will fall.
- The firm says the tree will "come back thicker" as if that were a benefit.
- Their photos show finished trees that are bare poles with stubs.
Ask one question: "Where will the cuts be made, and what is left growing beyond each cut?" Anyone doing a proper reduction can answer it in a sentence.
What it costs
Our price card gives these indicative ranges, which depend on size, access and the waste.
| Job | Small tree | Medium | Large |
|---|---|---|---|
| Crown reduction | £220–£300 | £320–£480 | £480–£750 |
| Pruning, crown lift or crown thin | £180–£280 | £280–£400 | £400–£600 |
Anything over £1,200 gets a free survey before the price is fixed.
Getting it priced
We are an introducer: we pass your enquiry to one vetted local tree surgeon who covers your area, and they confirm a fixed price. Start with crown reduction and the crown reduction cost guide, or pollarding. If reduction is not the answer, see tree removal and the tree removal cost guide; for a tall conifer hedge rather than a tree, see hedge reduction. Before you enquire, read what to photograph for a tree quote.
Questions
How much can you take off a tree in one go?
Less than most people expect. A reduction is specified in metres off the height and spread, and good practice keeps individual cuts small, generally under 100mm diameter. Taking a heavy reduction in one visit stresses the tree; where a big change is wanted, staging it over two or three years is safer.
Will a crown reduction make my tree grow back thicker?
It will produce new growth from the retained branches, which is normal. What you want to avoid is the dense mass of weakly attached shoots that follows topping. Properly reduced trees regrow in proportion and usually need attention again after three to five years.
Can a topped tree be repaired?
Sometimes it can be improved. An arboriculturist can select the strongest regrowth shoots and remove the rest over a few visits, so the tree rebuilds a branch structure rather than a mass of competing stems. It will not undo decay already in the stubs, and some topped trees are better removed.
Is pollarding bad for a tree?
Not if it is started young and kept to a cycle. Pollarded limes and planes live for decades in towns across the country. The problems come from pollarding a mature tree that has never been cut that way, or from starting a pollard and then abandoning it for twenty years.