Price What Connects the Austin ADU to the Property

A responsible site budget begins with a coordinated sketch and evidence register. It does not begin with a generic “utility allowance.”

Identify every provider and connection

Record the electric, water and wastewater providers for the address. Austin Energy and Austin Water serve many properties, but not every property using an Austin mailing address. Some areas involve municipal utility districts, other utilities or onsite wastewater.

List account/meter information, visible services, available plans and responsible provider contacts. Mark assumptions that require confirmation.

Draw the existing-service map

On the property plan, show:

• electric service, meter, panels and overhead/underground routes;
• water meter, service entry and likely private branches;
• wastewater cleanouts, building drain and available elevation information;
• septic components where applicable;
• communications;
• stormwater flow and roof discharge;
• trees, easements, paving and retaining work; and
• the proposed construction route.

Use locating, survey or field investigation where records do not establish the needed position.

Calculate electrical demand

The ADU may add electric cooking, water heating, cooling, receptacles and vehicle charging. Have qualified participants document the existing service and calculate the proposed load. Resolve panel location, service upgrade, meter assumptions, trench/conduit and work at the main house.

Ask whether the estimate includes provider work and restoration. A recent anecdote about an expensive transformer or service change is a warning to investigate, not a universal Austin price.

Plan water from meter to fixtures

Confirm the proposed connection, pipe route, sizing basis, protection, shutoffs and any work inside the existing dwelling. Identify provider application and meter requirements and who pays each charge.

Coordinate the water design with trees, paving and wastewater trenches. The shortest line may not create the least property disruption.

Establish the wastewater elevation

Gravity drainage depends on real elevations. Record the ADU fixture/floor level, connection point, route, slope basis, cleanouts and trench depth. If gravity is not supported, require a designed alternative and its ownership/maintenance implications.

For garage conversions, compare the desired floor with existing slab and sewer levels. For rear-yard units, price distance, access and restoration. Do not assume an existing house connection has unlimited capacity.

Coordinate drainage and impervious cover

Show the new roof, paths, driveway changes and other hard surface. Explain where runoff goes and how the finished grading protects both dwellings and neighbors. Check current Austin rules, including any HOME/infill provisions that apply to the property.

Temporary controls also matter. Define protection of exposed soil, excavations and stored material during heavy rain.

Protect trees during permanent and temporary work

Map trunks, canopies and relevant root areas. Then overlay foundations, trenches, equipment movement, material storage and grade changes. A tree conflict can come from construction logistics even when the final wall appears clear.

Obtain qualified tree input where needed and put protection details in the construction package. Enforce them before machinery arrives.

Measure access and restoration

Record gate and side-yard width, slopes, overhead lines, steps and vehicle staging. Decide how excavation, concrete, framing and waste move through the property.

List every surface or feature likely to be disturbed: paving, deck, fence, gate, irrigation, lawn, planting and interior finishes. State the restoration quality and photograph baseline conditions.

Price four layers for each service

Divide every utility into:

1. investigation and design;
2. provider/agency fees;
3. construction and connection; and
4. removal and reinstatement.

Label each amount fixed, quantity-based, allowance or owner-direct. Where the condition remains uncertain, state the unit rate or decision rule that will price it.

Keep an unknowns ledger

For every open site question, record the current assumption, evidence needed, responsible party, resolution date and potential consequence. Close high-impact unknowns before a fixed construction commitment when practical.

The Austin cost guide integrates this ledger with the owner forecast.

Price the access route as temporary infrastructure

Show how workers, excavation equipment and materials reach the unit. Identify temporary fence removal, ground protection, neighbor coordination, spoil removal and the surfaces that need repair.

If a crane, pump or compact machine is assumed, state the working area and access width behind the price. A plan that depends on access the site cannot provide needs a different construction method and a revised budget.

Coordinate drainage with the finished yard

New roof and paving change runoff. Draw roof discharge, grading, swales and any required controls with the final landscaping. Do not leave drainage as an undefined site allowance after foundation design.

Record who designs the system, who checks field elevations and who repairs affected irrigation and planting. The owner should receive the final drainage arrangement with closeout records.

Keep provider work on the main schedule

Utility applications, inspections, outages and meter work may sit outside the general contractor’s direct control. Add them as named activities with owners, prerequisites and status dates.

Long-lead provider work should be started when the approved concept is stable enough, not discovered after interior rough-in depends on it.