A foundation poured a few feet past a setback line can cost more to fix than the survey that would have caught it. Most land-related building problems start long before the first shovel hits the ground. They start when owners wait too long to bring in a land surveyor. The best time to call is early, before the design is locked, and again before layout begins.

This guide covers five points in a building project where survey work pays off. It’s written for property owners and developers, but architects, engineers, and contractors will find it useful too. Each section explains what the surveyor does at that stage and what you should ask for.

Before Finalizing the Building Location on the Property

Call a land surveyor before you commit to where the building will sit. A boundary survey shows where your property lines are, along with any fences, sheds, or driveways that cross them. Many owners rely on an old plat or a tax map, and those records can be off by several feet.

Setbacks depend on those lines. A setback is the minimum distance a building must sit from a property line, and the rules come from local zoning. If your lines are wrong, your setbacks are wrong, and that can lead to a failed inspection, a variance request, or a costly redesign.

Ask the surveyor to show recorded easements on the drawing too. An easement gives someone else, often a utility company, the right to use part of your land. Building over one can cause trouble with permits, title, and a future sale.

When Existing Site Conditions Could Affect the Design

A topographic survey is the right tool here. It maps the shape of the ground, including elevations, slopes, trees, pavement, visible utilities, and nearby structures. Your architect and civil engineer use it as the base for grading, drainage, and foundation design.

Small lots and older properties often hide surprises. Old retaining walls, buried utility lines, sudden grade changes, and poor drainage can all shape where a building fits. Finding them early is far cheaper than finding them after the plans are drawn.

The right scope depends on the site and what your design team needs. Some projects also call for a floodplain check or tree locations for permit review. Talk with your engineer before ordering so the survey covers what they’ll use.

Before Construction Plans Move Into Final Coordination

Survey data should be checked against the design before plans are finalized. This is when the architect, engineer, and surveyor confirm that the building, grading, and utility connections fit the real site. Catching a conflict now means changing a line on a drawing instead of moving concrete.

Many permit reviews ask for a site plan based on current survey data. Requirements can vary by jurisdiction, property type, and project scope, so confirm early what’s expected. An older survey may not be accepted, especially if the site has changed.

Also ask whether the survey uses the same vertical datum as the design files. A datum is the reference used to measure elevations. If the surveyor and engineer use different ones, grades on the plans can be wrong enough to cause drainage problems.

When Property Constraints Could Change the Project Scope

Some survey findings go beyond moving the building a few feet. They can change the size, shape, or type of project you’re able to build. Knowing this early helps you adjust budgets and timelines before paying for full design.

Common constraints include encroachments, access problems, and right-of-way lines. An encroachment is anything that crosses a property line, like a neighbor’s garage or your own driveway. Right-of-way is land set aside for streets, sidewalks, or utilities, and it can be wider than it looks from the curb.

If you’re buying land to build on, order the survey before closing when you can. That gives you time to negotiate, ask the seller to fix issues, or walk away. Commercial buyers and lenders often ask for an ALTA/NSPS Land Title Survey, which follows a national standard and ties closely to the title report.

Before Site Work and Construction Layout Begin

Call the surveyor again before any digging starts. Construction staking, also called construction layout, marks building corners, grades, and utility lines on the ground so crews build in the right place. Without it, even a perfect plan can end up in the wrong spot.

Many projects need more than one visit. A surveyor may stake the foundation, then return to check the forms before concrete is poured. Some owners also order an as-built survey to confirm the finished work matches the approved plans.

Protect the stakes once they’re set. Equipment and weather can knock them out, and replacing them costs time and money. Ask your contractor to report missing or disturbed marks right away.

Frequently Asked Questions

Do I need a new survey if I already have an old one?

It depends on how old the survey is and what’s changed since. New fences, additions, or driveways can make an old survey outdated. Permit offices, lenders, and title companies may also set their own age limits. A land surveyor can review your existing survey and tell you whether an update will work.

What type of survey do I need before building?

Most building projects start with a boundary survey and a topographic survey. Some sites also need an easement review, a floodplain check, or an ALTA/NSPS survey for commercial deals. Your architect or engineer can help define the scope. Share your plans with the surveyor so the survey matches the project.

How long does a survey take before construction?

Timing varies with the site size, the records research needed, and the surveyor’s workload. Simple lots often move faster than large sites or ones with conflicting records. Busy building seasons can stretch schedules too. Ask for a timeline with your quote, and order early if permits or closing depend on it.