If you've been told you need a Root Protection Zone investigation before an extension goes ahead, or you've got a tree in visible decline and no one can tell you why, digging with a spade or a mini excavator is the wrong tool. Every cut through a root with a blade is permanent damage, and on a lot of Nottingham gardens sitting on shallow sandstone, a digger bucket does as much harm to the ground as it does to the roots. Air spade excavation uses compressed air instead of a blade to strip soil away from roots without severing them, which is why it's become the standard method for root investigation work near foundations, basements and buried services. We use it as an extension of work we already do underground — the same root system assessment we carry out before relocating a tree applies directly to air spade investigations, because both start with knowing exactly where the roots run before anything gets disturbed.

This isn't a bolt-on service we subcontract out when someone asks for it. George, who founded the business on stump removal before it grew into full tree surgery, still runs every job hands-on, and air spade work sits naturally alongside the root-level work the company was built on. If you're weighing up whether your project needs it, or you just want a straight answer about what compressed-air excavation can and can't do on your particular plot, read on.

• Exposing roots around the root collar and root plate to diagnose girdling roots, collar rot or decay without cutting into them
• Clearing soil and old mulch build-up that's smothering the root flare and starving the tree of oxygen
• Locating and exposing buried drains, cables or ducting that run through a root system, so you know exactly what's there before anyone digs by hand or machine
• Trenching for a utility run, extension footing or driveway close to a tree, with roots left intact and simply worked around
• Root Protection Zone investigation and root mapping to support a BS5837 arboricultural report for planning or building control
• Decompaction and soil replacement where compacted ground close to a house or driveway is restricting root growth
• Photographic and written findings from the excavation, useful evidence if a tree officer or structural engineer needs to see what's under the surface before a decision is made

• Writing the BS5837 arboricultural impact report itself — we expose and map the roots, a qualified arboricultural consultant produces the planning document if the local authority requires one
• Repairing or replacing any drain, cable or duct we expose — that's a job for the relevant utility contractor or plumber, we just get you eyes on it without cutting through it first
• Structural assessment of subsidence or foundation cracking — we can tell you what a root is doing, not whether your foundations need underpinning
• Bulk groundworks or full-plot excavation — an air spade is precise and slow by design, it's not a substitute for a digger on a large-scale dig
• Fixed day rates quoted without a site visit — soil type, sandstone depth and access all change the time on site, so we won't guess a figure over the phone
• Work in frozen or waterlogged ground, which reduces how effectively compressed air breaks up the soil and can be pushed back a few days if conditions are against us

1. Initial call -- Tell us what's prompting the job — a planning condition, a tree in decline, an extension due to start, or a buried service you need to find safely. George or the team will ask about the tree species, its distance from the structure and whether there's already a survey or arb report in place.
2. Site visit and ground assessment -- Before any air spade comes out of the van, we look at the actual ground — is it topsoil over Sherwood sandstone, heavy clay, or made-up ground from a previous build? Sandstone close to the surface changes how deep we can realistically expose roots and how long the job takes, so this gets checked on site, not guessed from a photo.
3. Marking out and service checks -- We mark the excavation area and cross-check against any known utility runs before starting. If the job includes locating a drain or cable inside a root plate, this is where we agree the target area with you.
4. The excavation itself -- The compressor and air lance break up soil into fine spoil while roots, cables and pipework are left physically undisturbed. Spoil is either bagged for removal or kept on site for reinstatement, depending on what you've asked for. This is the noisiest stage — a petrol or diesel compressor running for the duration — so we agree timing with neighbours in advance where the site is tight to a boundary.
5. Findings and recommendations -- Once roots or services are exposed, we photograph and record what's there — root diameter, direction, any decay or girdling, exact depth to any service found. If the job feeds into a planning application, this record goes to whoever is producing the arb report.
6. Reinstatement -- Exposed roots are protected and backfilled with suitable material, not just the spoil pile shovelled back in, and we talk you through any aftercare the tree needs before we leave.

George's team runs air spade work themselves rather than subcontracting it to a groundworks or utility-locating firm, which is where this differs from how a lot of tree surgeons handle root investigation — a legacy of the stump grinding the business was founded on, when George started clearing stumps other firms left behind. The practical difference on an air spade job is that whoever's holding the air lance is also NPTC-certified in aerial and rigging work, so they know what a girdling root or an early sign of collar rot looks like the moment it's exposed, rather than a groundworker who's skilled at running the compressor but wouldn't necessarily flag what matters underneath. That's useful when the whole point of the job is diagnosis, not just moving soil. We carry £5,000,000 public liability cover, worth asking about directly if the work is happening within touching distance of a basement wall or foundation. And George's rule on scope is to expose only as much ground as the actual question needs — enough to see a girdling root, trace a drain run, or check a root collar for decay — rather than opening up more than the job calls for, because every extra hour a root sits exposed to air is an hour it's drying out for no reason.

We're based at Long Eaton and cover Nottingham as the main area of work, with a lot of our root investigation jobs falling in the parts of the city where shallow Sherwood sandstone sits close to the surface — The Park Estate is the clearest example, where the same soft sandstone that Nottingham's cave network is cut into also means Victorian and Edwardian basements sit directly against bedrock, and root work there needs to account for stone as much as soil. West Bridgford and the older terraces around it have a similar mix of cellars and shallow foundations where we'd default to air spade over any mechanical dig. Wollaton and Bramcote tend to give us heavier clay rather than exposed sandstone, which changes how the compressor performs and how long a job takes. Further out, Ravenshead and Southwell sit on more open, semi-rural plots where root protection work is usually tied to a planning condition on a garden extension rather than a basement concern. We also cover Beeston, Attenborough, Edwalton, Gamston, Ruddington, Bingham, Arnold, Woodthorpe, Carlton, Mapperley and Hucknall, and take on jobs further afield in Derby and Mansfield where the ground conditions and the reasons for the work tend to be much the same.

A planning condition, a declining tree or a buried service near a root system is a lot cheaper to sort out properly now than to discover halfway through groundworks, when a digger has already cut through something that mattered. Get in touch to arrange a site visit and we'll tell you straight what the ground is doing and what it'll take to investigate it without damage.

Stump Grinding and Stump Removal Services
Call 0115-647-2443