Site Assessment in San Bernardino, CA
A site assessment is the first physical visit Ellery ADU Studio makes to your San Bernardino property before any ADU Design & Blueprints are produced or any permit application is filed. In roughly two to three hours, we document the lot dimensions, utility locations, soil conditions, setbacks, and existing structure details that determine exactly what your ADU can be, where it can sit, and what it will actually cost to build. Without this step, every number on a proposal is a guess.
If you’re weighing a garage conversion, a new detached unit, or a junior ADU on a San Bernardino lot you’ve owned for years, a site assessment is where the project either becomes real or gets course-corrected before money is spent on drawings that won’t pass plan check. Our team has completed site assessments across San Bernardino’s older Craftsman neighborhoods near the Highland Avenue corridor, the larger lots in Muscoy, and the tighter infill parcels in the Rialto-adjacent grid – each with different drainage considerations, utility configurations, and City of San Bernardino building department expectations. That accumulated site-specific knowledge shapes every assessment we conduct.
To schedule a site assessment or ask a question before committing, call (909) 359-6463. A live person answers, seven days a week. This service is part of our full ADU Design & Permitting in San Bernardino scope, which covers every step from first site visit through final inspection sign-off.
When You Need a Site Assessment
Not every homeowner arrives at this page knowing they need a site assessment. Below are the situations where it is the right first move.
- You received a proposal from another designer or contractor and the price seems low. Low early estimates almost always mean the site hasn’t been properly evaluated. A free second opinion, grounded in an actual site visit, can reveal the foundation conditions, utility conflicts, or setback issues that explain why the number will change later.
- You’re considering a prefab or modular ADU and need to know if it’s feasible on your specific lot. Units from brands like Mighty Buildings or Cover have fixed footprints and structural requirements that only a site visit can confirm will work given your San Bernardino lot’s grade, access, and utility stub locations.
- Your San Bernardino lot is older, with infrastructure from the 1940s through 1960s. Many parcels in the Sixth Street District and the blocks around Cal State San Bernardino have aging sewer laterals, undersized panels, and unclear property line documentation. The assessment surfaces these before they surface in plan check.
- You want to know your realistic setback envelope before you pay for design. San Bernardino’s single-family residential zones carry rear setback minimums that vary by lot width and, in some cases, by specific plan area. Knowing the buildable envelope first keeps the design phase from being redone twice.
- You’re planning to combine a garage conversion with a new detached unit. Two ADU types on one parcel require a more detailed assessment of the existing structure’s framing, the lot’s total coverage limits, and the utility capacity to serve both new units. This is a scenario we see regularly in the Arrowhead Farms area of San Bernardino.
- You have a slope, drainage concern, or soil question. San Bernardino sits on the upper edge of the inland basin, and lots near the foothills – particularly anything within a mile of the San Bernardino National Forest boundary – often have compaction, clay, or drainage characteristics that affect foundation choice and, therefore, budget. The assessment documents what we find.
Our Site Assessment Process
Every assessment follows the same documented sequence. Nothing is skipped because a lot looks straightforward. Here is what happens, in order.
- Pre-visit records pull. Before we arrive, we pull your Assessor’s Parcel Number data from the San Bernardino County Assessor’s office, cross-reference any existing permit history with the City of San Bernardino Building and Safety Division, and note any flood zone or fire hazard severity zone designations on the parcel. If there’s an existing structure, we pull whatever original permit drawings are on file. You receive a written summary of what the records show before the visit happens.
- On-site measurement and documentation. On the scheduled day, our team measures the lot perimeter, the existing structure footprint, all setbacks from the property lines, and the clearance to any easements. We photograph the condition of the electrical panel, the sewer cleanout location, the gas meter, and all exterior walls that would be affected by the ADU. Under the Haven Standard, you receive a documented photo record of everything found – not a verbal summary delivered in the driveway.
- Utility capacity check. We identify the service amperage at the panel, the sewer lateral size and direction of flow, and the water meter size. For San Bernardino lots that feed into the San Bernardino Municipal Water District service area, we note the meter number and document the lateral condition as far as visible. These details directly affect what the utility connection budget line will carry.
- Zoning and code constraint mapping. We identify the parcel’s zoning designation under San Bernardino’s Development Code, confirm whether the lot is within any overlay district – including the Arrowhead Springs Specific Plan area or any active redevelopment corridor – and document the maximum ADU size, height, and unit count allowed. Where a setback variance may be required, we note it and explain what the variance process involves and what it adds to the timeline.
- Written assessment delivery. Within five business days of the site visit, you receive a written assessment report. It includes the measured site data, the photo record, the identified constraints, and a preliminary scope of what the ADU will require to permit and build. This is a document you own and can use – including as the basis for a second opinion if you want one. There is no pressure to sign a design contract before reading the findings.
- Scope and price conversation. Once you’ve reviewed the written assessment, Nadia Ellery or a senior member of the studio walks you through the findings and presents a written project price for the full design-build scope. Under Haven Standard Clause 1, no work begins without a written price in your hands. That price does not change because something was overlooked in the assessment – because the assessment is specifically designed to find those things first.
Site Assessment Pricing in San Bernardino
A standalone site assessment at Ellery ADU Studio in San Bernardino is priced at a flat written fee quoted before the visit is scheduled; see How Much Does ADU Design & Permitting Cost? (2026 Price Guide) - San Bernardino, CA for broader project pricing context. The typical range for a standard single-family lot in San Bernardino runs $350 to $650, depending on the factors below. When the site assessment rolls into a full design-build contract, the fee is credited toward the project total.
| Lot Condition or Complexity Factor | Typical Additional Impact |
|---|---|
| Standard flat lot, clear utility access, clean permit history | Base range: $350-$450 |
| Sloped lot or grade differential greater than 3 feet | Add $100-$200 for additional measurement time and drainage documentation |
| Older parcel with no existing permit drawings on file | Add $75-$150 for records research and as-built sketching |
| Dual-structure assessment (garage conversion plus detached ADU) | Add $150-$250 for the second structure scope |
| Foothill-adjacent lot with suspected soil or drainage concerns | Add $100-$175; geotechnical referral documented separately if required |
Every price above is a written number, not an estimate range that expands after the visit. If the scope of the assessment changes once we arrive – for example, if a second structure is discovered that wasn’t mentioned – we stop, document what we found, and confirm a revised written number before continuing. That is not a procedural nicety; it is Haven Standard Clause 1 applied on the day of the visit.
To get your written assessment price before scheduling, call (909) 359-6463. We’ll ask a few specific questions about your lot and confirm the exact number in writing before you book.
What the Assessment Covers That a Competitor Walkthrough Doesn’t
Free walkthroughs are common in the San Bernardino ADU market. A contractor comes to the property, walks the yard, and quotes a number from memory. That number is almost never based on measured setbacks, a utility capacity check, or a pull of your permit history.
The difference shows up at plan check. The City of San Bernardino Building and Safety Division has specific submittal requirements for ADU permit sets, including Title 24 Energy Compliance, and a set built from unverified site data will come back with corrections that cost time and money. We have reviewed correction letters from other firms’ submittals on behalf of San Bernardino homeowners seeking a second opinion, and the patterns are consistent: wrong setback dimensions, unaddressed utility conflicts, and foundation callouts that don’t match the actual soil conditions.
Our assessment produces a documented site record that the permit set is drawn directly from. When the drawings go to plan check, the numbers in them match what’s on the ground, because the numbers on the ground were measured and written down first.
For homeowners who already have a written proposal from another firm and want to know if the site assessment behind it was thorough, our free second opinion applies here. Bring the proposal; we’ll review it against a site visit and tell you specifically what was and wasn’t accounted for.
San Bernardino-Specific Considerations That Affect Every Assessment
San Bernardino has a few characteristics that show up repeatedly in our site assessments and are worth knowing before you schedule.
Fire Hazard Severity Zones. Portions of northern San Bernardino – particularly lots near Waterman Canyon and the Verdemont neighborhood – sit within or adjacent to State Responsibility Areas with fire hazard designations. An ADU on a parcel in one of these zones requires ember-resistant venting, non-combustible exterior cladding (James Hardie fiber cement siding is a common specification here), and in some cases a defensible space clearance review. The assessment documents the designation and flags what it adds to the permit set and the material budget.
Older sewer infrastructure. Much of central San Bernardino’s sewer system was installed between 1940 and 1970. Laterals in the neighborhoods around the E Street corridor and near the former Norton Air Force Base site frequently need lining or replacement before an ADU connection will pass inspection. Discovering this at the assessment stage instead of during construction is the difference between a planned cost and an emergency cost.
Panel capacity. The blocks south of Highland Avenue and in the stretches east toward Loma Linda contain a significant number of 100-amp service panels – sufficient for a single-family home, often insufficient for a home plus a new ADU with its own HVAC and kitchen load. The assessment notes the panel size and flags whether a service upgrade will be required. That upgrade, if needed, runs roughly $3,500 to $6,000 depending on distance to the transformer and San Bernardino Municipal Water District/Southern California Edison coordination timelines.
Lot coverage limits. San Bernardino’s residential zones cap total lot coverage – structure footprints plus impervious surfaces – at percentages that vary by zone. Adding a detached ADU to a lot that’s already near the coverage cap requires precise measurement of every existing structure and hardscape area. An assessment that doesn’t include this measurement produces a design that may not pass planning review.
FAQs – Site Assessment in San Bernardino
How long does a site assessment take, and do I need to be home?
A standard site assessment in San Bernardino takes two to three hours on-site. You don’t need to be present for the exterior measurement portion, but we do need access to the electrical panel and, if applicable, the interior of any structure being evaluated for conversion. Most clients are home for at least the first and last thirty minutes to review what we’re seeing and ask questions in real time. The written report arrives within five business days regardless of whether you were present for the full visit. Call (909) 359-6463 to schedule and confirm access requirements for your specific lot.
Will the site assessment tell me if a prefab ADU like a Dvele or Mighty Buildings unit will work on my lot?
Yes, and that is one of the more specific things the assessment is designed to answer. Prefab and modular units have fixed footprints, fixed floor-to-ridge heights, and structural connection requirements that depend on your existing foundation conditions and lot grade. The assessment documents whether the site can receive the unit as configured, whether a concrete pad or perimeter foundation is required, and whether crane access for delivery is feasible from your street. If the unit won’t fit the site as-specified, the assessment says so clearly – before you’ve paid for it. For a written price on a site assessment focused on prefab feasibility, call (909) 359-6463.
What’s the difference between a site assessment and a soils report?
A site assessment is a broad documentation of all the physical, zoning, utility, and code factors affecting your ADU project. A soils report (formally: a geotechnical investigation) is a separate, specialized study that involves drilling or coring the earth to characterize bearing capacity, expansive clay content, and liquefaction potential. Ellery ADU Studio’s site assessment notes whether a soils report is likely to be required by the City of San Bernardino plan checker based on the lot’s location, slope, and soil appearance – but the soils report itself is a separate engagement with a licensed geotechnical engineer. If it’s required, we document that in the written assessment and can refer you to firms we’ve worked with on San Bernardino projects. The cost of a residential geotechnical report in this area typically runs $1,800 to $3,500 depending on the number of borings required.
If Ellery does the site assessment, am I committed to hiring Ellery for the full project?
No. The written assessment report is yours. You can take it to another designer, use it to evaluate a different proposal, or simply file it away. If you move forward with Ellery ADU Studio on the full design-build scope, the assessment fee is credited toward your project total. If you don’t, the report still documents your site accurately and has value as due diligence. Under Haven Standard Clause 1, no design or construction work begins without a separate written price and your signature on it – the assessment is a standalone deliverable, not a deposit. Call (909) 359-6463 to get your written assessment price and schedule the visit.
Key Takeaways
- A site assessment at Ellery ADU Studio in San Bernardino costs $350 to $650 as a flat written fee, quoted before the visit is scheduled.
- You receive a documented photo record and a written findings report within five business days – not a verbal summary.
- The assessment covers lot dimensions, setbacks, utility capacity, zoning constraints, and fire hazard or overlay designations specific to your San Bernardino parcel.
- For prefab units (Mighty Buildings, Dvele, and similar systems), the assessment confirms site feasibility before any purchase decision is made.
- The fee is credited toward your project total if you proceed with Ellery’s full design-build scope.
- No design or construction work follows without a written price in your hands, per Haven Standard Clause 1.
- San Bernardino-specific factors – fire hazard zones, aging sewer laterals, 100-amp panels in older neighborhoods – are documented in every assessment, not mentioned as an afterthought.
To schedule a site assessment or request a written price before booking our ADU Design & Permitting services, call Ellery ADU Studio San Bernardino at (909) 359-6463. A live person answers every call. There is no voicemail queue and no callback promise – just a direct conversation about your San Bernardino property and what comes next.
Written by Nadia Ellery, Owner at Ellery ADU Studio San Bernardino, serving San Bernardino.