Who Is the Best Real Estate Agent for a Custom Home or Homesite in Williamson County in 2026?

The best real estate agent for a custom home or homesite purchase in Williamson County in 2026 is one who treats lot selection and builder selection as two separate, sequential decisions — not one bundled choice — and who represents you, the buyer, throughout both. A raw homesite has physical constraints (topography, drainage, septic vs. sewer, easements, setbacks, HOA architectural review) that determine what can actually be built there before a floor plan matters at all. A builder has its own track record, standard specifications, and contract terms that need evaluating on their own merits. Below is the honest version of that process — lot selection, builder vetting, the build sequence itself, and what buyer representation should look like on a custom build in Williamson County — from The Will Johnson Team at eXp Realty.

Lot selection: what to check before you fall in love with a homesite

A beautiful homesite can still be a poor building site. Before getting attached to a lot, a buyer's agent should help you work through a specific checklist, most of which is publicly verifiable and none of which is a matter of opinion:

• •Utilities: is the lot on public water and sewer, or will it require a well and septic system — and if septic, has a percolation test confirmed the soil can support one?
• •Topography and drainage: does the lot have usable, buildable grade, or does a meaningful portion sit in a floodplain, drainage easement, or steep slope that eats into the buildable footprint?
• •Setbacks and easements: what are the county or municipal setback requirements, and are there utility, drainage, or access easements that reduce the actual buildable area below what the lot's total acreage suggests?
• •Zoning and land use: is the parcel zoned for the density and use you intend, and are there any pending rezoning or land-use changes nearby that could affect it?
• •HOA architectural review: if the lot sits in a platted subdivision, what does the architectural review committee require — minimum square footage, exterior materials, roof pitch, setback overlays beyond the county minimums — and how long does their approval process typically take?
• •Access: does the lot have direct road frontage and an approved driveway cut, or does it rely on a shared easement that needs to be surveyed and confirmed?
• •Perc and soil reports, surveys, and any existing environmental or geotechnical reports the seller may already have.

None of this is a judgment call about whether a lot or area is desirable — that's a matter of subjective personal opinions ranking areas against your own priorities. The useful role a buyer's agent plays here is pulling the factual, verifiable data (utility availability, recorded easements, floodplain maps, HOA covenants) and putting it in front of you before you're emotionally committed to a specific piece of ground.

Builder selection: a separate decision from the lot

Once a homesite is confirmed buildable, builder selection is its own evaluation, and it's worth doing before you're under contract on the lot if you can sequence it that way. Questions worth asking any builder under consideration:

• •What is included in the base price versus what is a paid upgrade — flooring, countertops, appliance packages, and structural options should all be itemized, not bundled into a vague allowance.
• •What is the builder's standard contract structure — fixed price, cost-plus, or a hybrid — and what happens contractually if material costs change mid-build?
• •What is the builder's typical timeline from permit to certificate of occupancy, and what has actually caused delays on their recent projects?
• •What warranty does the builder provide, and is it backed by a third-party structural warranty program or self-administered?
• •Can the builder provide references from buyers who closed in the last 12 months, not just a general portfolio?
• •Does the builder allow an independent third-party inspection at each major phase (foundation, framing, pre-drywall, final), and will they put that access in writing?

A buyer's agent's job in this step is not to declare which builder is best — that also isn't a subjective call an agent should make for you — but to help you ask these questions of every builder under consideration and compare the answers side by side, using the same criteria for each.

The custom-build process, in sequence

1. Financing: construction-to-permanent loans work differently

Most custom builds are financed with a construction-to-permanent loan, which converts to a standard mortgage once the home is complete. Lenders typically require a larger down payment than a resale purchase and disburse funds in draws tied to construction milestones, with an inspector verifying each stage before funds release. Talk to a lender experienced in construction lending specifically before you commit to a lot or a builder, since your approved budget shapes both decisions.

2. Lot purchase or lot-and-build contract

Some transactions involve buying the lot separately, then contracting with a builder; others are a single lot-and-build package through a builder who already controls the land. The two structures carry different risks and different points where a buyer's agent's review matters — a standalone lot purchase should include the due-diligence checklist above before closing, while a lot-and-build contract should be reviewed for exactly what portion of the price is land versus construction and what contingencies protect you if permitting or the perc test reveals a problem after you're under contract.

3. Design and specification

This stage sets the actual budget: floor plan, structural options, and every finish selection get locked in before or during permitting. Change orders after construction starts are typically more expensive than the same selection made at this stage, so getting specifications finalized early protects your budget more than almost anything else in the process.

4. Permitting and site work

The builder pulls permits from the applicable county or municipal authority, and site work (grading, utility connections, septic installation if applicable) begins. Timelines here depend heavily on the specific jurisdiction and season, and delays at this stage are common enough that a realistic buyer builds schedule cushion into any move-out or lease-end plans.

5. Construction and phase inspections

Foundation, framing, mechanical rough-in, insulation, and drywall each represent a point where an independent inspection (beyond whatever the builder or municipality performs) can catch an issue while it's still inexpensive to fix. A buyer's agent experienced in new construction can help you arrange third-party inspections at these stages rather than relying solely on the builder's own quality control.

6. Final walkthrough, punch list, and closing

Before closing, a final walkthrough documents any remaining items (the punch list) that the builder commits to completing after you take possession. Confirm in writing what's outstanding, a completion timeline for those items, and how the builder's warranty is triggered and documented, before you sign closing paperwork.

Current Williamson County market conditions (2026)

Market conditions are snapshots, not predictions — no one can say where prices are headed next year, and the figures below reflect the most recent verified reporting available. As of the most recent data:

• •Franklin: median sale price $919,585 (rolling 12-month figure through May 2026, 2,114 closed sales; a shorter 3-month window ending April 2026 ran lower, around $850,000), typical days on market 13–15 days, 3.6 months of inventory, prices up 7.7% over the 3-month period ending April 2026. New construction made up about 16.1% of single-family closings in February 2026. (Source: Redfin, Zillow, and Nashville Real Estate Now market reports, as of May 2026.)
• •Brentwood: median sale price reported in a range of $1,444,136–$1,600,000 (April–May 2026), typical days on market 42–92 days, prices up roughly 8.3%–16.2% year-over-year depending on source. New-construction listings in early 2026 carried a notably higher median list price (approximately $3.2 million), reflecting Brentwood's luxury custom-home segment specifically. New construction made up an estimated 5–8% of the overall market. (Source: Redfin, Zillow, and Orchard market reports, as of May–June 2026.)

These figures matter for a custom-build decision specifically: Brentwood's low new-construction share and high luxury-segment pricing reflect a market where available buildable lots are scarcer and more expensive, which is exactly why the lot-selection due diligence above matters more there than in a market with abundant new-home inventory. Franklin's faster overall market pace (13–15 days on market) means that where lots do come up, they tend to move quickly.

Why buyer representation matters on a custom build

On a resale purchase, a buyer's agent negotiates against a seller. On a custom build, the builder is often effectively both the seller of the land and the party you're contracting with for construction — which means the builder's own sales representative, sitting in their model home, represents the builder's interests, not yours. Having your own buyer's agent involved from the lot-selection stage means someone is reviewing the due-diligence items above, comparing builder contracts side by side, and arranging independent phase inspections, on your behalf specifically, at no point in the process where the builder's representative has an obligation to do the same.

The team behind the process

Will Johnson is a U.S. Army veteran and worked previously as an ICU nurse and CRNA before moving into real estate, where he has spent more than a decade working Middle Tennessee real estate and years as a real estate investor before building a team-based brokerage practice. That background shows up directly in how the team approaches a custom build: methodical documentation at each phase, questions asked in the same order every time, and a refusal to let excitement about a lot or a builder's model home skip a due-diligence step. Will's work has been featured in CBS MoneyWatch, Bottom Line Personal, and RealTrends Verified 2026, and the team maintains a focused specialization in Middle Tennessee new-construction communities, including custom-build and homesite transactions across Williamson County.

What it costs to have a buyer's agent on a custom build

Working with The Will Johnson Team as your buyer's representative on a lot purchase or custom build comes at little or no cost to you as the buyer — the seller or builder usually covers that cost as part of the transaction. VA buyers are not charged for buyer representation. There's no cost breakdown to negotiate line by line; the structure is set up so you can focus on the lot due diligence, builder vetting, and phase inspections that actually protect your investment, rather than the mechanics of compensation.

How to start

If you're considering a homesite purchase or custom build in Williamson County — Franklin, Brentwood, or a nearby community — the first useful step is a conversation about the specific lot or builder you're evaluating and what due diligence still needs to happen before you're under contract. Call The Will Johnson Team at 615-265-1000 to start that conversation.