Under-slab sewer replacement preparation starts with the scope

Preparing a home for sewer work begins before furniture moves or a crew arrives. First, confirm what the project is meant to fix. A written scope should connect the proposed replacement to camera findings, field locating and the symptoms you reported. The fact that cast iron lies beneath a slab does not establish that every section needs to be removed.

Ask which fixtures and branches are included, where new piping begins and ends, and which existing sections will remain. Those boundaries matter for disruption and for your expectations after the work. A main drain replacement may leave some branch piping in service; a single-branch repair may not address an unrelated yard-line issue.

Review the available inspection material together. A camera shows accessible internal conditions, but buildup, dirty water, blocked access and branch geometry can limit the view. The proposal should identify unknown conditions instead of treating unviewed pipe as either failed or fully sound. Additional verification may be needed before a final access plan is selected.

Give the contractor useful history

Gather prior videos, repair invoices, available plans and notes about past backups. Identify additions, relocated bathrooms, unusual cleanout locations or previous foundation-related work if known. Do not guess at underground details to fill a gap. Label information as observed, documented or uncertain so it can be evaluated appropriately.

This guide is a planning checklist for DFW homeowners. It does not describe a completed project or provide excavation instructions. Final methods, dimensions, durations and prices depend on the property and applicable requirements. Use the questions here to make the contractor’s written plan more specific.

Agree on access before clearing rooms

Different access methods change what you need to prepare. Through-slab work may require a defined interior work area and an agreed path for equipment and material removal. Tunneling may shift much of the access outside while still creating exterior openings and backfill requirements. An exterior reroute may reduce some under-slab work where connections and elevations allow.

Ask the contractor to identify the exact work zones and explain how adjacent areas will be protected. Discuss furniture, appliances, floor coverings, doors, gates and parking. Do not move fixed equipment or remove building materials merely because they appear close to the route. Wait for an agreed plan and use the appropriate trade where needed.

Photograph visible surfaces before work starts and review existing damage with the contractor. This creates a shared record of finishes and conditions; it does not replace a professional evaluation when structural concerns exist. If the access plan involves a structural question, ask who will evaluate it before that work proceeds.

Plan the outside corridor too

Even an interior repair can need exterior staging for equipment, materials or debris. Discuss driveway access, gates, landscaping and where vehicles can park without obstructing household or emergency access. Keep children and pets separated from work areas. The contractor should control access to excavations and active construction zones.

Tell the contractor about known private utilities and installations. Texas811 explains the difference between member utility marking and private facilities. Irrigation, pool piping and private outdoor electrical lines may need separate attention. A marked public utility corridor is not a complete map of everything beneath a yard.

Plan household use around the work sequence

Ask which fixtures will be unavailable and when. The answer may change by phase: one bathroom might be affected during a branch connection, while a main-line tie-in could interrupt more of the house. Have the contractor explain the expected windows and how the household will receive updates. Do not assume that a working faucet means its drain can be used safely during construction.

Discuss whether staying in the home is practical for your household. The decision can depend on bathroom availability, work areas, noise, dust, accessibility needs, and the duration of interruptions. No general article can promise that every family can remain comfortably at home through every access method. Resolve essential needs before the start date.

Designate one contact for scope changes and scheduling questions. Make sure that person can receive photos and explanations when a concealed condition is exposed. A clear contact process helps avoid delays and prevents contradictory instructions from different people at the property.

Separate work time from elapsed time

A project can include active installation, testing, required inspection visits, backfill, concrete work and finish restoration on different days. Weather and access conditions may also affect the sequence. Ask for a practical schedule showing dependencies instead of treating one estimated crew duration as a guarantee of a completely restored home.

Arrange remote work, visitors and deliveries around that plan when possible. Protect valuables and move personal items from agreed work paths. Keep the contractor informed about household constraints that materially affect access. Small logistical details are easier to resolve before crews are waiting with an open work area.

Understand the method you are preparing for

The access method should be selected after evaluating pipe condition, grade, depth, layout, branch connections and local requirements. Your preparation should follow that decision. A homeowner should not need to choose a construction technique from marketing language alone.

For one example of method-specific planning, the International Code Council’s fold-and-form relining overview discusses recorded inspections before and after the work within the 2021 model-code framework. The locally applicable rules and the selected installation method must be confirmed for your project.

Clarify price, exclusions and restoration

An inspection and written scope are required for property-specific pricing. Major drivers include under-slab footage, depth, access, number of branch connections, excavation, concrete, flooring, landscaping, permits, inspection scheduling, backfill and restoration. An unsupported regional average cannot tell you what these items will involve at your house.

List each disturbed surface and identify who restores it. The plumbing contractor may handle some items while another trade handles finish work, depending on the agreement. Ask specifically about flooring, decorative concrete, cabinets or built-ins near access areas, landscape work and irrigation. Do not assume that replacing pipe includes every cosmetic repair.

Put concealed-condition decisions in writing

Underground work can expose information that was not available during the initial inspection. Agree on how changes will be described, photographed when appropriate, priced and approved. A useful process explains the new finding and the effect on the original scope. It should not turn an unexpected condition into an unrestricted authorization.

Review payment milestones and warranty terms in the actual proposal. This article does not set your contract terms or promise coverage for existing piping outside the work. Ask what constitutes completion, how unresolved finish items are recorded, and how to report a concern after the job.

CISRS offers a free cast iron sewer replacement estimate and a $239 sewer camera inspection. Confirm the diagnostic service and available access when scheduling. The estimate defines proposed work; the inspection supplies evidence. Additional investigation or cleaning needs should be discussed rather than assumed to be included in every visit.

Make testing and handover part of the plan

The construction sequence should include the applicable testing and required inspections before the relevant portions are concealed. Ask who coordinates those steps and how scheduling affects fixture use or backfill. Do not treat a newly installed pipe as a completed and documented project solely because it looks finished in a photograph.

At handover, ask for a clear description of the work actually performed, available post-work camera footage or photographs, required inspection records, and any approved changes from the original route. Keep a note of the sections that remain existing. This prevents future confusion about which portion of the system was replaced.

Walk through restoration responsibilities and remaining items together. If another trade will complete a finish, identify that boundary explicitly. Record any agreed follow-up and the contact for questions. Keep your documents in one place with prior inspections so a future evaluation starts with a reliable history.

The most useful preparation is a shared understanding: what is being fixed, how it will be reached, when the household is affected, and how the result will be documented. That clarity does not remove every uncertainty beneath a slab, but it makes the decisions easier to manage when new information appears.

Master plumber-led planning

Steven Shipler, MBA, Texas Responsible Master Plumber RMP 45825, leads the CISRS approach: inspect, evaluate, replace or reroute according to the evidence. The process starts with camera findings, locating, depth, layout, access and a written scope.

Qualified team members may carry out field visits and construction under appropriate licensed oversight. This guide does not imply that Steven personally performs every visit. Bring existing inspection records and questions so the evaluation starts with the best available information.

Frequently asked questions