07716 484668

Decommissioning &Tank Removal Contractors InBishop Auckland & The North East

Petrol tanks, process plant, pipework and redundant equipment gas-freed, cleaned and removed under a job-specific method statement, with the paperwork to prove it was done safely.

Free site survey, written fixed price, and full RAMS from our in-house health and safety person, backed by 50+ years of family experience in demolition.

50+ yrs
Family experience in demolition, trading as Century since 2021
£5m / £10m
Public and product liability / employers' liability cover
SSIP
SSIP and Constructionline accredited for health and safety
CCDO Gold
Gold-carded supervisors, CCDO and CPCS operatives as a minimum
24/7
Phones answered every day of the year, attendance aimed within the hour
The service

What this work involves, and who it is for

What decommissioning & tank removal covers

Decommissioning is the safe removal of tanks, vessels, pipework and process equipment that has reached the end of its working life: petrol forecourt tanks, factory storage tanks, redundant boilers, silos, pipe runs and process plant. It is a distinct discipline from general demolition because the equipment itself can hold residual fuel, product, vapour or sludge, and has to be made genuinely safe before any cutting or dismantling starts.

Century Demolition Ltd sequences every decommissioning job the same way: identify what the equipment held, isolate the supply, empty and clean it, test the atmosphere and confirm it is gas-free, then cut, dismantle and remove. Only once that sequence is complete do we treat the equipment as a standard demolition item. Where the wider site also needs demolishing or the ground beneath a removed tank needs remediating, we run it as one contract rather than three separate ones.

Who we do it for

Forecourt operators and fuel retailers decommissioning redundant petrol and diesel tanks ahead of a redevelopment or a site closure.

Factory owners, industrial operators and principal contractors with redundant process plant, storage tanks, pipework or vessels to remove as part of a wider strip-out or demolition, plus public bodies and estate managers holding legacy tanks and equipment on sites they are bringing back into use.

When it is needed

Ahead of demolishing or redeveloping a former forecourt or industrial site, when tanks and pipework have to come out before groundworks can start.

When a factory or process line is being decommissioned, mothballed or replaced and the old plant, tanks and pipework need to be cleared out.

When a tank or vessel is found during a demolition or remediation contract that was not recorded on the original drawings.

When insurance, planning or environmental conditions require redundant tanks to be removed rather than simply capped and left in the ground.

Why it pays to use a demolition contractor

Tanks and process equipment carry a risk that ordinary structures do not: residual product, vapour and sludge that make cutting or moving them dangerous if the equipment has not been properly emptied, cleaned and gas-freed first. Getting that sequence wrong is how fires, explosions and atmospheric incidents happen on decommissioning sites.

A contractor who treats gas-freeing and cleaning as a genuine, tested step, not a formality before the interesting work starts, is what keeps a tank removal routine instead of dangerous. We quote every decommissioning job individually after a site visit, and the survey and written quote are free.

Free site surveys and quotes. We price job by job, with no obligation to proceed.

Leave it and it costs more

What happens if this is left alone

Redundant tanks and process equipment do not become safer by being left in place, and a rushed or shortcut removal is one of the more serious ways a site can end up with an incident on it.

Risks and escalating cost

  • Residual fuel, product or sludge left in a tank can ignite or cause an atmospheric incident the moment cutting or hot work starts, with consequences far beyond a normal demolition accident.
  • Corroding tanks and pipework left in the ground can leak, contaminating soil and groundwater and turning a straightforward removal into a remediation project.
  • Redundant equipment left in place attracts trespass and metal theft, both a safety hazard and a liability for the site owner.
  • A planning or environmental condition requiring tank removal that is left unresolved can hold up sale, redevelopment or occupation of the site.
  • Undocumented removal leaves no record for future owners, buyers or environmental searches that the ground was ever affected or properly made safe.

Mistakes we are called in to fix

  • Assuming a tank is empty because it has not been used for years, residual product and sludge remain even in tanks that look empty.
  • Cutting or hot-working a tank or vessel before it has been tested and confirmed gas-free, rather than after.
  • Using a general demolition or groundworks contractor for tank work without decommissioning-specific competence and equipment.
  • Leaving tanks capped and buried rather than removed, on the assumption this satisfies a planning or environmental condition when it may not.
  • Not keeping a record of what was removed, when and how, leaving a gap in the site's history for future transactions or environmental searches.
How it works

Our process, start to handover

  1. Step 1

    Free site survey and inspection

    We attend site, identify every tank, vessel and item of process plant to be decommissioned, establish what each held, and confirm access and isolation requirements. No charge, no obligation.

  2. Step 2

    Method, RAMS and fixed written quote

    Our in-house health and safety person produces the risk assessments and method statement covering isolation, emptying, cleaning, gas-freeing and removal, and you receive these with a written fixed price.

  3. Step 3

    Isolation, emptying and cleaning

    Supplies are isolated, residual product and sludge are removed, and the tank or vessel is cleaned to the standard required before any atmospheric testing takes place.

  4. Step 4

    Gas-freeing and atmospheric testing

    The tank or vessel is tested and confirmed gas-free before any cutting, hot work or dismantling begins, with a fire marshal on site for all hot works that follow.

  5. Step 5

    Cutting, dismantling and removal

    Once confirmed safe, the equipment is cut, dismantled and removed by CCDO and CPCS carded operatives under supervision, with redundant pipework and associated plant removed in the same operation.

  6. Step 6

    Ground check, documentation and handover

    The area beneath and around the removed equipment is inspected for signs of leakage or contamination, waste is routed through a licensed recycling facility, and full documentation is issued for your records.

What you get

Why clients keep us on their list

Gas-freeing treated as a genuine step, not a formality

Tanks and vessels are emptied, cleaned and tested before any cutting starts, with the sequence written into the RAMS and followed on site, not assumed.

One contractor for decommissioning, demolition and remediation

Where a site needs tanks removed, buildings demolished and ground remediated, all three sit with us, avoiding gaps in supervision between separate contractors.

Documented safety, not assumed safety

In-house health and safety, SSIP and Constructionline accreditation, CCDO Gold supervision and fire marshal cover on every hot works operation, evidence your insurer or client can read.

Ground checked as part of the job

The area around a removed tank is inspected for leakage or contamination as standard, so a hidden ground problem does not surface later in an environmental search.

Fixed written price

Every decommissioning job is surveyed and quoted individually, so you agree a figure in writing before we mobilise rather than tracking variable costs on a hazardous job.

Cover if it goes wrong

£5 million public and product liability and £10 million employers' liability across all decommissioning and demolition-related work, so the risk does not sit with your business.

The detail

Decommissioning & Tank Removal: materials, methods and variations

Tanks, plant and equipment we decommission

Underground and above-ground petrol and diesel tanks on forecourts, garages and depots, along with the associated pipework, dispensers and interceptors that go with a forecourt decommissioning. Factory and industrial storage tanks for fuel, oil, chemicals and process liquids, ranging from single vessels to a full tank farm.

Redundant process equipment including boilers, silos, ovens, conveyors, pressure vessels and pipe runs left behind when a production line or process is retired. Domestic and commercial heating oil tanks, and legacy septic tanks or cesspits found during land remediation work, which follow the same emptying and testing discipline scaled to the size of the vessel.

Methods, plant and controls

Every job starts with isolation of the supply and identification of what the tank or vessel actually held, since the cleaning and gas-freeing method differs between fuel, oil, chemical and process residues. Emptying and cleaning is carried out before any atmospheric testing, and testing is repeated as needed until the vessel is confirmed gas-free; this is the point that has to be right before hot work is permitted.

Cutting and dismantling uses appropriate plant for the vessel size, from hand tools and cold-cutting on smaller domestic tanks through to mechanical plant and supervised hot works on larger industrial vessels, with a fire marshal on site for any hot works. Underground tanks are excavated using tracked plant once confirmed empty and safe, and the surrounding ground is checked for signs of historic leakage before backfill.

Variations of the service

Forecourt decommissioning, covering tank removal, pipework, dispensers and interceptors ahead of a site redevelopment or closure. Factory and process plant decommissioning, where a production line, boiler house or tank farm is stripped out as a unit rather than piece by piece.

Single tank removal, where one redundant vessel, a heating oil tank, a septic tank, an isolated storage vessel, is dealt with on its own. Decommissioning combined with demolition and remediation, where the tank removal is one stage of a wider site clearance and the ground beneath it is assessed and remediated in the same contract.

Commercial and industrial differences from domestic work

Commercial and industrial decommissioning, particularly on forecourts and process plants, usually involves environmental permitting considerations, historic contamination records and a principal contractor's own permit-to-work system that our RAMS and documentation are prepared to fit into. Equipment is often larger, and pipework runs can extend well beyond the immediate tank area, so the survey has to map the full extent of the system before pricing.

Domestic tank removal, a redundant heating oil tank, a disused septic tank, is smaller in scale and generally arranged directly with the homeowner, but the same emptying, cleaning and testing sequence is followed regardless of size. Where a domestic tank shows signs of leakage, the ground beneath it is checked before backfilling.

Working across County Durham, Teesside and Tyneside

We are based at 9 The Mill, Ramshaw, Bishop Auckland, keeping most of County Durham within a short mobilisation and Darlington, Teesside, Middlesbrough, Newcastle and Sunderland comfortably in range for site visits and ongoing works. Contract works are taken nationwide.

Our permanent team of eight scales to around twenty with trusted subcontractors, giving us the capacity to resource a multi-tank forecourt or a full process plant decommissioning without pulling cover from smaller jobs already committed.

FAQs

Decommissioning & Tank Removal: straight answers

If your question is not covered here, ring us. The phone is answered by people who do the work, not a call centre.

Cost depends on the number and size of tanks or vessels, what they held, how much pipework is involved, and access to site. We attend, survey and issue a written fixed price free of charge once we know the extent of what needs decommissioning.
Next step

Get a written price for your decommissioning or tank removal: surveyed free, RAMS included

Tell us what needs to come out and what it held. We attend, survey the site at no cost, and come back with a fixed written price plus the risk assessments and method statement covering isolation, cleaning and gas-freeing before any cutting starts.

  • Free survey and written price
  • SSIP & Constructionline accredited
  • £5m / £10m insured
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