Sewer Repair
Sewer Repair near you
Most British householders who go looking for sewer repair are actually looking at a private drain: the run inside their own boundary that carries waste from the house towards the public system. That distinction decides everything about the job, because in England and Wales the public sewer and the lateral drain beyond the boundary passed to the water and sewerage companies in the 2011 adoption of private sewers, and a repair on those is carried out by the company rather than paid for by you.
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What remains yours is often the oldest and most fragile part of the system. Salt-glazed clay laid before the war, joints that have opened as the ground has moved, runs re-routed around a 1970s extension, and inspection chambers buried under a patio are the everyday findings of a drain camera in this country. Approved Document H, the statutory guidance supporting Part H of Schedule 1 to the Building Regulations 2010 in England, is clear that repairs, reconstruction and alterations to existing drains and sewers should be carried out to the same standards as new work.
There is also a notice requirement people rarely expect, and a build-over problem that surfaces whenever an extension is planned near the line of a drain. Both are covered below.
The notice you must give before repairing a drain, and the powers behind it
Under section 61 of the Building Act 1984, anyone intending to repair, reconstruct or alter a drain must give the local authority twenty-four hours' notice of that intention, except in an emergency. Where the work is done as an emergency, it must not be covered over without giving that notice, and free access must be given to the local authority to inspect the works. Approved Document H sets this out alongside the point that material alterations to existing drains and sewers are covered by the building regulations even though routine repairs are not.
There are enforcement powers on the other side of the same relationship. Under section 59 of the Building Act 1984 a local authority may require the owner of a building to carry out remedial works where a soil pipe, drain or private sewer is insufficient, in a condition prejudicial to health or a nuisance, or so defective that subsoil water leaks into it. Under section 114 of the Water Industry Act 1991 a sewerage undertaker may examine and test a drain or private sewer connecting with a public sewer where it believes the pipe is injurious to health, a nuisance, or so defective that subsoil water is getting in.
England is the jurisdiction Approved Document H covers. Northern Ireland works to its own Technical Booklets published by the Department of Finance, with Technical Booklet N covering drainage, published in October 2012, and Scotland operates its own building standards system. Ask a local contractor how compliance is evidenced where you live before assuming the English documents apply.
Signs a drain needs repair rather than another clearance
- The same run blocks again within weeks of being jetted, which usually means something structural is catching solids.
- A dip, soft spot or sinkhole in a lawn, path or driveway following the line of the drain.
- Rats indoors or in the garden: Approved Document H notes that disused and defective pipework is known to harbour rats.
- Persistent damp, or a smell of sewage in a cellar or under a suspended floor, with no visible leak above ground.
- Waste water standing in an inspection chamber long after the appliances upstream have finished draining.
- Drainage that fails only in wet weather, which can indicate groundwater entering a cracked pipe and using up its capacity.
- A CCTV survey report describing cracks, fractures, deformation, open joints, displaced joints or root ingress.
From CCTV survey to completed repair: how the work is scoped
A survey should come before a price. A camera run along the drain, with a report and a plan showing where each defect sits and how deep it is, turns an argument about symptoms into a list of locations. Ask for the footage and the written report, not just a verbal summary, because you will need both if a second contractor quotes or if the work turns out to sit on a pipe you do not own.
Records matter as much as the camera. Approved Document H points out that copies of the sewer record maps are held by the sewerage undertaker and by local authorities and are available for inspection during office hours, and that where a public sewer requires repair or replacement it will be carried out by the sewerage undertaker. Checking the map first tells you whether the defective length is even yours to repair.
LokalMatch is where the quotations come from. Describe the job once — what the survey found, whether the defect is inside your boundary, whether access for a machine exists, your postcode — and drainage contractors covering your area get in touch with you. They pay for the requests they receive. LokalMatch neither performs the repair nor sets the price, and does not vet, rank or recommend anyone, so comparing what each quotation actually includes, particularly reinstatement of the ground afterwards, remains your job.
Repair methods used on British drains
- Patch lining, which bonds a short resin-impregnated liner across a single cracked or open joint without excavation.
- Full-length relining, forming a new pipe inside the old one along an entire run, with connections reopened afterwards.
- Excavation and replacement of a collapsed or badly deformed length, which is the fallback where lining cannot work.
- Root cutting followed by lining, since cutting alone leaves the joint that let the roots in.
- Re-jointing or replacing a short section where the pipe has displaced at a junction.
- Installing a missing access point so the run can be rodded in future, rather than repeating an expensive dig.
- Sealing a length that has been permanently taken out of use, which section 62 of the Building Act 1984 requires at the points the local authority directs.
Line it, patch it, or dig it up?
Lining wins when the host pipe still holds its shape. A run with open joints, hairline cracks or root ingress but a sound line and level is the classic candidate, and the appeal is obvious: no trench across the garden, no lifted block paving, and a working drain the same day. Patch repairs suit a single defect; full relining suits a run with several.
Excavation wins where the pipe has lost its shape or its position. A collapsed section, a badly deformed length, a drain that has dropped out of line so that solids stand in it, or a run laid at a gradient that never worked cannot be cured by putting a liner inside it. Excavation is also the honest answer where the pipe is too small for what it now serves.
Two practical points tilt the decision. First, ask what happens to connections along a lined section and how they will be reopened. Second, ask who reinstates the surface: the difference between a drain repair under a lawn and the same repair under a resin driveway or a tiled kitchen floor is mostly the cost of putting the ground back, and quotations vary in whether they include it.
Pipe sizes, bedding and access points a repair should restore
- A drain carrying foul water should have an internal diameter of at least 75mm, and one carrying the discharge from a WC at least 100mm.
- A sewer serving more than one property should normally be at least 100mm where it serves no more than ten dwellings, and at least 150mm above that.
- Where a drain or sewer runs under a building, at least 100mm of granular or other suitable flexible filling should be provided around the pipe.
- Connections into another drain or into a public sewer should be made obliquely, or in the direction of flow, using prefabricated components.
- Access points come in four types — rodding eyes, access fittings, inspection chambers with working space at ground level, and manholes with working space at drain level — chosen by depth.
- Access to a sewer serving more than one property should be somewhere accessible and apparent in an emergency, such as a highway, public open space, an unfenced front garden or a shared driveway.
- Repairs, reconstruction and alterations should be carried out to the same standards as new drains and sewers, so a repair that leaves a run unroddable has not finished the job.
Extensions built over drains, and the build-over agreement you need
This is where drain repair and home improvement collide. Requirement H4 of the building regulations says the erection or extension of a building, or work involving underpinning, must be carried out so that it is not detrimental to the building or to the continued maintenance of the drain, sewer or disposal main. The guidance applies to building over or within three metres of the centreline of an existing drain, sewer or disposal main shown on the sewerage undertaker's records, whether the sewer is public or not.
The detail is stricter than most people expect. Buildings and extensions should not be constructed over a manhole, inspection chamber or other access fitting on a sewer serving more than one property. The length of drain or sewer under a building should not exceed six metres without the owner's permission, and building over or within three metres of any drain or sewer deeper than three metres or larger than 225mm in diameter also needs that permission. A satisfactory diversionary route should exist so the pipe could be reconstructed later without affecting the building, and that route should not pass within three metres of it.
In practice this means an agreement with your water company. Thames Water, for example, requires a build over agreement for work within three metres of a public sewer, or within one metre of the point where a pipe serving only your property crosses your boundary, and warns that without one you may not get a building regulations completion certificate, which causes problems when you sell. It can also seek an injunction to remove a building that limits its ability to maintain or repair a public sewer, and liability for damage caused to the sewer during construction sits with you. Applications are assessed within a stated period and the agreement is a document to keep with the deeds.
Sewer Repair: frequently asked questions
A survey says my drain has collapsed beyond the boundary. Is that my repair?
In England and Wales that length is a lateral drain and it passed to the water and sewerage company in the 2011 adoption of private sewers, so the repair is theirs. Approved Document H states plainly that where repair or replacement of a public sewer is required it will be carried out by the sewerage undertaker. Send them the survey and the plan rather than accepting a quotation to excavate your garden.
Do I have to tell anyone before repairing a drain?
Yes. Section 61 of the Building Act 1984 requires twenty-four hours' notice to the local authority before repairing, reconstructing or altering a drain, except in an emergency — and in an emergency the work must not be covered over before that notice is given, with free access provided for inspection. Material alterations to existing drains are also covered by the building regulations, so ask your contractor who is giving notice.
Can I build my extension over a drain?
Sometimes, with the owner's agreement and with conditions. The guidance covers building over or within three metres of the centreline of a drain or sewer on the undertaker's records; the length under a building should not exceed six metres without permission; you should not build over a manhole or inspection chamber on a shared sewer; and a diversionary route should remain available. Water companies handle this through a build over agreement, and building without one can leave you without a completion certificate.
How do I find out where the sewers actually run?
Ask for the sewer records. Approved Document H notes that copies of the sewer record maps are held by the sewerage undertaker and by local authorities and can be inspected during office hours. It is worth doing before you design an extension rather than after the foundations are set out, because the map determines whether requirement H4 and a build over agreement come into play at all.
Does Approved Document H apply across the UK?
No. Approved Document H is guidance for building work carried out in England. Northern Ireland has its own Technical Booklets from the Department of Finance, with Technical Booklet N covering drainage, published in October 2012, and Scotland runs a separate building standards system. The underlying engineering is much the same, but quote the right document for where you live.
How does LokalMatch work for a drain repair?
One description of the job reaches drainage contractors covering your postcode, and they contact you. They pay for the request; you do not. LokalMatch does not carry out repairs, set prices, or vet, rank or recommend any contractor, so ask each firm for its survey findings in writing and check whether reinstating the ground afterwards is included in the figure.
Sources
- GOV.UK: Approved Document H — drainage and waste disposal
- Approved Document H, 2015 edition (full text)
- Thames Water: do I need a build over agreement?
- Thames Water: building over sewers or public drains
- Water Industry Act 1991, section 106: right to connect to public sewers
- The Water Industry (Schemes for Adoption of Private Sewers) Regulations 2011
- Department of Finance: Northern Ireland building regulations technical booklets
Written by the LokalMatch editorial team. Last reviewed 14 September 2026. How we write and check our guides
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What affects the cost of sewer repair
Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:
- Type of problem and how easy it is to find
- Access to pipes behind walls, under floors or underground
- Parts and fixtures chosen
- Age and material of the existing pipes
- Emergency, evening or weekend service
- Permits and inspections, where required
How to compare plumbers before you hire
- Hire a plumber who is licensed for this work in your area, especially for gas water heaters, sewer lines and new plumbing.
- Ask whether they charge a flat rate or by the hour, and what the call-out fee covers.
- For leaks and drain problems, choose someone who explains the cause and doesn't only clear the symptom.
- Get the scope in writing for larger jobs such as a water heater, sewer repair or re-piping.
- If it's urgent, ask how soon they can arrive and whether after-hours rates apply.
Questions to ask plumbers before you hire
- Are you licensed for plumbing work in my area?
- Do you charge a flat rate or by the hour, and is there a call-out fee?
- What do you think is causing the problem?
- Will this work need a permit or an inspection, and who will arrange it?
- Will you need to open walls, floors or the yard to reach the problem?
- What warranty do you offer on parts and labour?
When to call a pro for sewer repair
- An active leak: shut off the main water valve if you can reach it safely, then call a plumber.
- Sewage backing up into drains or the basement
- No hot water, or water pooling around the water heater
- Pipes that may have frozen during a cold snap
Sewer repair permits and local rules
Some sewer repair work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.
Permits and licensingSeasonal maintenance
This job is part of our home maintenance checklists for:
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