What Is Not Included in an ADU Quote for Temecula Homeowners

What an ADU Quote in Temecula Does Not Include

Direct Answer

An ADU quote in Temecula usually prices the building and standard finishes. It often leaves out city permit fees, a site plan, and site work such as grading, retaining walls, and trenching. School fees start above 500 square feet, and city impact fees start above 750 [1][2][3].

TL;DR

An early ADU quote prices the building, and fees plus lot-specific site work get added as separate lines [3].
ADUs with 750 square feet of interior livable space or less pay no city impact fees, and larger units pay a share based on size [1][4].
TVUSD charges $5.38 per square foot on ADUs over 500 square feet, and $0 at 500 or less with an exemption application [2].
Plan check and permit fees apply at any size [4][3].
Units converted from existing space can't be required to add a new utility connection, while new builds can [1][4].
Slope, trench distance, septic, and panel capacity get priced after a site visit [3].
Before comparing bids, check the square footage, fees, connections, solar, and site lines each one assumes [1][3].

One-liner: In Temecula, unit size and build type decide which fees land on an ADU quote, and a site visit prices the rest.

Key Numbers

Number	What it means	Source
$5.38 per sq ft	TVUSD school fee on ADUs over 500 sq ft, effective June 16, 2026	TVUSD, 2026 [2]
$0	TVUSD school fee on ADUs of 500 sq ft or less, with an exemption application	TVUSD, 2026 [2]
About $3,770	School fee on a unit TVUSD counts at 700 sq ft	Calculated from TVUSD's 2026 rate [2]
750 sq ft	Interior livable space at or below which an ADU pays no impact fees	Cal. Gov. Code 66311.5, as in effect January 1, 2026 [4]
500 sq ft	Largest allowed junior ADU, and its impact fee exemption line	HCD ADU Handbook, March 2026 [1]
50 percent	Share of a new home's impact fee that a 1,000 sq ft ADU beside a 2,000 sq ft house could pay	HCD ADU Handbook, March 2026 [1]
30 days	How long a TVUSD Certificate of Compliance stays valid	TVUSD, 2026 [2]
100 or 125 amps	Home electrical service that usually needs an upgrade to power a second unit	Woollard Construction, 2026 [3]

Two ADU bids for the same Temecula backyard can land tens of thousands of dollars apart. When that happens, the gap is almost never the building itself [3]. It's the lines one bid priced and the other left out.

That's why knowing what is not included in an ADU quote matters as much as the total. Some items, like city permit fees and a site plan, come up on nearly every project [3]. Others, like school fees, depend on the size of the unit you build. In Temecula, a 499 square foot unit and a 749 square foot unit don't carry the same fees [1][2]. Here's what gets added, when it applies, and what to ask before you sign.

What Is Not Included in an ADU Quote

In short: An early ADU quote prices the building. Public fees and site work tied to your lot get added later as separate lines.

What is not included in an ADU quote falls into two groups. The first is fees set by the city, the school district, and your water or sewer provider. The second is site work that depends on your lot, like a site plan, a soils report, grading, retaining walls, and long utility trenches [3].

The first number prices the house before anyone has priced the ground under it. Here's who sets each missing line and when it shows up.

Line item	Set by	When it applies
Fees
City permit and plan check fees	City of Temecula	Nearly every permitted ADU [3]
City impact fees	City of Temecula	Units over 750 square feet, charged in proportion to the main house [1][4]
School fees	Temecula Valley Unified School District (TVUSD)	Units over 500 square feet [2]
Utility connection fees	Your water or sewer provider	Possible on new builds, generally not on units converted from existing space [1][4]
Site costs
Site plan	Your lot and design	Every project [3]
Soils report and grading plan	Your lot	Mainly sloped lots [3]
Grading and long utility trenches	Your lot	Units set farther from the main house, or on rock [3]
Retaining walls	Your lot	Sloped lots [3]

Three of the fee rows turn on how big the unit is or whether it's new construction. The next two sections sort those out.

ADU Fees Change at 500 and 750 Square Feet

In short: Your unit's size decides whether school fees and city impact fees apply.

Keeping an ADU at 750 square feet of interior livable space or less removes city impact fees under California law as of January 1, 2026 [1][4]. In Temecula, school fees still apply once the unit passes 500 square feet, and plan check and permit fees apply at any size [4][2][3]. Interior livable space means the rooms, closets, and stairs inside the unit [1].

Here's how the lines fall in Temecula [1][2].

Unit size	City impact fees	TVUSD school fees	Plan check and permit fees
500 sq ft or less	None	$0, with an exemption application	Charged
501 to 750 sq ft	None	$5.38 per sq ft	Charged
Over 750 sq ft	A share based on size compared with the main house	$5.38 per sq ft	Charged

A junior ADU tops out at 500 square feet, so it sits under both lines [1][2][5]. If you're weighing stock plan sizes, check where each one lands on these lines [6].

School Fees From TVUSD

If your lot sits inside TVUSD boundaries, the district charges $5.38 per square foot on ADUs over 500 square feet [2]. That rate took effect June 16, 2026. If TVUSD counts a unit at 700 square feet, the fee comes to about $3,770. The district counts all covered space within the structure's perimeter, so its number can differ from the livable square footage on your plans [2].

Even when the fee is $0, TVUSD has three steps [2]:

An exemption application for any ADU at 500 square feet or less
A Certificate of Compliance for every project, paid or not, valid for 30 days while you pull the permit
A running total, so earlier additions, garage conversions, and ADU additions on the same building count toward the 500 square foot line

Before you settle on a size, ask TVUSD whether earlier work on your home counts toward that total.

City Impact Fees Above 750 Square Feet

Impact fees help cover public facilities tied to new building [4]. State law bars them on an ADU with 750 square feet of interior livable space or less, and that includes park fees [1][4]. Above 750 square feet, a city can charge them, but only as a share based on the unit's size compared with the main house [1][4]. In the state housing department's 2026 handbook example, a 1,000 square foot ADU next to a 2,000 square foot house could pay 50 percent of the fee for a new home [1]. Because that share depends on the square footage of both units, it belongs on its own line in a quote.

Utility Connection Fees: Converting Space vs Building New

In short: Connection fees follow how the unit is built. A garage conversion can't be forced into a new connection, while a new unit can.

Connection fees and capacity charges aren't impact fees, so staying at 750 square feet or less doesn't remove them [1][4]. What counts is whether the unit is carved out of space that already exists [1][4].

Build type	New separate connection	Connection fee or capacity charge
Converted from existing space, such as a garage conversion or junior ADU	Can't be required, unless built with a new house	Can't be charged, with the same exception
New attached or detached unit	Your water or sewer provider may require one	May be charged, sized to the unit's load on the system

That's one more point in favor of a garage conversion, which already skips a new foundation, walls, and roof [7]. You can still choose a separate meter, which costs more up front and makes billing a tenant simpler [3]. If a quote lists a new water meter or sewer line, ask whether the provider requires it or the design chose it. The state housing department doesn't oversee gas or electric service, so take those questions to the utility [1].

ADU Site Costs in Temecula That Need a Site Visit

In short: Site costs come from your lot, so they get priced after someone walks it.

Some people call these hidden ADU costs. They stay off the first number because nobody can price them before seeing the property. A flat lot and a sloped one can price out as two different jobs [3]. Here's what a site visit checks:

Slope and drainage. A sloped lot can bring a soils report, a grading plan, engineered foundation work, and retaining walls. It often drives the budget on Crowne Hill hillsides [3].
Distance to the main house. The farther the unit sits from the house, the longer the trench for water, sewer, and power. Rock or decomposed granite costs more to dig per foot [3].
Sewer or septic. On septic, Riverside County reviews whether the system can handle a second home, which can mean a larger leach field or a new system. It weighs most on Wine Country properties [3].
Electrical panel. Older homes on 100 or 125 amp service usually need more capacity before they can power a second unit [3].
Garage slab. For conversions, a slab that slopes toward the door needs leveling before it becomes living space [7].

The cost breakdown shows how much each one moves the price [3]. If a bid already lists a site line, ask whether it came from a visit or is a placeholder allowance.

Why Do ADU Quotes Vary So Much?

In short: Bids differ mostly in what they include, and unit size changes the fees.

ADU quotes vary because they include different things. One bid lists fees and site work as separate lines, while another leaves them out or folds them into a single number. In Temecula, the size of the unit also decides which fees apply [1][2][3].

Before comparing totals, find out what is not included in an ADU quote from each builder. One bid might show one fees line while another splits out plan check, school, and impact fees. Ask both builders the same questions:

Line on the bid	What to ask	Why the answer moves the total
Unit size	What livable square footage is this price based on?	Small changes can cross the 500 or 750 fee lines [1][2]
Fees	Are plan check, school, and impact fees included?	School and impact fees follow unit size [1][2]
Utility connection	Does it assume a new water or sewer connection?	Conversions of existing space can't be required to add one [1][4]
Solar	Is the required solar system in the price?	Generally required on new detached ADUs, not on conversions [1]
Fire sprinklers	Does the price include fire sprinklers?	Required only if the main house has to have them [1]
Site work	Which site lines came from a visit?	Slope, trenching, and septic vary by lot, and skipped checks can return as change orders [3]

Getting a Complete ADU Quote in Temecula

In short: A complete quote shows the building, the fees, and the site work as separate lines, priced after someone walks your lot.

The line items tell you more than the total. Woollard Construction prices the building first, then prices your site and fees after walking the lot and getting your site plan [3]. Finish upgrades get their own line [3]. After the visit, you get a number for your property instead of a range [3].

Before you sign with anyone, check the contractor's license through the Contractors State License Board [8]. Call (951) 551-6165 to set up a free site visit [9]. You'll leave knowing which of these lines apply to your lot.

Frequently Asked Questions

In short: Size and build type decide most of these answers.

Are ADUs 750 square feet or smaller exempt from all fees in Temecula?

No. They skip city impact fees, but plan check and permit fees still apply, Temecula's school district charges fees above 500 square feet, and new builds may owe connection fees [1][4][2].

What is not included in an ADU quote for a garage conversion?

Typically city permit fees, a site plan, and school fees once added space tops 500 square feet. Slab leveling or a panel upgrade gets priced after someone inspects the garage, and no new utility connection can be required [1][4][2][7].

Does a junior ADU pay school fees or impact fees?

No impact fees, since a junior ADU tops out at 500 square feet. School fees usually don't apply either, but Temecula's school district requires an exemption application and counts earlier additions toward its 500 square foot line [1][2].

Is solar required on a new ADU in Temecula?

Generally yes for a newly built detached ADU, under the state energy code, and the panels can go on the ADU or the main house. Units built inside existing space, like garage conversions, don't need it [1].

Definition Bank

Term	Plain definition
Accessory dwelling unit (ADU)	A home on the same lot as a main house, with its own space for living, sleeping, cooking, and sanitation [1]
Junior ADU (JADU)	A unit of up to 500 sq ft of interior livable space inside a single-family home, which may share a bathroom with it [1]
Interior livable space	Space meant for living, sleeping, eating, cooking, or sanitation, including closets and interior stairs [1]
Impact fee	A charge tied to project approval that helps pay for public facilities. For ADUs it includes park fees but not connection fees [1][4]
Proportional impact fee	A reduced impact fee for an ADU over 750 sq ft, based on its size compared with the main house [1]
Plan check fee	A city fee for reviewing plans, which falls outside the legal definition of an impact fee [4]
School fees	Per square foot fees a school district charges on residential construction to fund school facilities, also called developer fees [2]
Level 1 fees	The per square foot school fee rates the State Allocation Board sets every two years [2]
Exemption application	The TVUSD form required for ADUs of 500 sq ft or less, which owe no school fee [2]
Certificate of Compliance	A TVUSD form showing a project was reviewed for school fees, valid for 30 days [2]
Capacity charge	A water or sewer charge that state ADU law keeps separate from impact fees [4]
Existing space conversion	An ADU built inside an existing house or accessory structure, such as a garage [1]

Entity Cards

Temecula Valley Unified School District (TVUSD)

Property	Value
Type	Public school district
Fee authority	Education Code 17620 and Government Code 65995 [2]
ADU fee over 500 sq ft	$5.38 per sq ft, effective June 16, 2026 [2]
ADU fee at 500 sq ft or less	$0, exemption application required [2]
Certificate of Compliance	Issued for every project, valid 30 days [2]
Square footage rule	Counts covered space within the perimeter. Additions on the same building add up toward 500 sq ft [2]

California Government Code 66311.5 (as amended by SB 543)

Property	Value
Type	California statute
Amending law	SB 543, Chapter 520, Statutes of 2025 [1]
In effect	January 1, 2026 [1]
Impact fees	None on ADUs at 750 sq ft of interior livable space or less, or junior ADUs at 500 or less [4]
School fees	Units under 500 sq ft of interior livable space are treated as not adding 500 sq ft of assessable space [4]
Utility connections	Units built from existing space can't be required to add a separate connection unless built with a new house [4]

HCD Accessory Dwelling Unit Handbook

Property	Value
Publisher	California Department of Housing and Community Development [1]
Edition	March 2026 [1]
Reflects law in effect	January 1, 2026 [1]
Topics used here	Impact fees, school fees, utility connections, solar, fire sprinklers, junior ADUs [1]

City of Temecula (ADU fees)

Property	Value
Impact fees on ADUs of 750 sq ft or less	None, under state law [4]
Impact fees on ADUs over 750 sq ft	A proportional share based on the main house [4]
Plan check and permit fees	Apply at any size [4][3]
Development impact fee schedule	Fiscal Year 2026-27, effective July 1, 2026 [10]

Woollard Construction

Property	Value
Legal name	Woollard Construction Inc. [3]
California contractor license	B-842038 [3]
Building in the Temecula Valley since	2004 [3]
Service area	Temecula, Murrieta, Menifee, Wildomar, Lake Elsinore [7]
ADU types	Detached, attached, garage conversion, junior ADU [3]
First step	Free site visit, (951) 551-6165 [3]

Sources

Spencer Woollard

Spencer Woollard has 30+ years of experience in custom construction in Southern California. With over 350 completed projects including ADUs and bathroom remodels, Spencer is a trusted local contractor in Temecula, CA.

What an ADU Quote in Temecula Does Not Include