Architectural and engineering-led design-build for high-end Peninsula homes.
Explore preliminary construction budgets for kitchens, bathrooms, whole-home renovations, additions, ADUs, and custom homes. We connect design decisions with structural requirements and construction costs from the beginning.
Discuss your projectClear expectations from the first proposal through the final walkthrough.
Your proposal spells out the scope, inclusions, exclusions, and allowances. Proposed changes to the work and price are documented for approval before the affected work proceeds.
We outline the major phases, upcoming decisions, and expected milestones. When permitting, selections, or site conditions affect timing, we explain the impact and next steps.
Know who to call and who is coordinating your project. We keep design questions, engineering decisions, and construction updates connected throughout the work.
We plan dust control, floor protection, material storage, and cleanup around the work underway and any occupied areas. Site organization is part of the job.
Use these ranges to start a conversation about scope. They are preliminary construction budgets, not fixed quotes, all-inclusive project totals, or upper limits. Size, selections, existing conditions, and site access can move a project outside the ranges shown.
$80,000–$200,000+
Demolition, cabinetry, counters, flooring, lighting, and plumbing and electrical work within the kitchen. Appliance and finish allowances must be set for your selections.
Major structural alterations, additions, and whole-house system upgrades are separate scope items.
$40,000–$100,000+
A complete bathroom with waterproofing, tile, vanity, fixtures, lighting, and associated plumbing and electrical work.
Large primary bathrooms, extensive layout changes, premium stone, and custom millwork can exceed this range. A primary-suite addition is priced as an addition.
$300–$600+ / sq ft
Use the floor area being renovated. This band is intended for substantial interior work with coordinated kitchens, bathrooms, finishes, and building-system improvements.
Illustration: 2,000 renovated sq ft × $300–$600 = $600,000–$1.2 million in construction, before separately budgeted items. Extensive structural or foundation work and exceptional finishes can cost more.
$500–$850+ / added sq ft
New enclosed living area with conventional foundation, framing, enclosure, building systems, and interior finishes on an accessible site.
Illustration: 800 added sq ft = $400,000–$680,000 in construction. Renovating existing rooms, reinforcing the existing house for a second story, and unusual site work are additional scope.
$300,000–$550,000+
A preliminary construction band for a roughly 800–1,000 sq ft site-built ADU with a kitchen, bathroom, conventional foundation, and interior finishes.
Confirm utility connection routes, service upgrades, access, and site preparation separately. Small units may cost more per square foot; garage conversions need a separate assessment.
$700–$1,100+ / sq ft
Use the new conditioned living area for a preliminary house-construction budget. The design, structural system, windows, finishes, and building systems shape the final number.
Illustration: 3,000 sq ft = $2.1–$3.3 million in house construction. Land, garages, basements, major site work, landscaping, and pools are separate. Exceptional homes can exceed this band.
Allow separately for architectural design, engineering, surveys and specialist consultants; permits and agency fees; an owner-held contingency; and temporary housing, storage, or moving. Also identify demolition of an existing house, major excavation, shoring, retaining walls, unusual foundations, off-site utility work, hazardous-material remediation, and exterior improvements where applicable.
The planning bands assume contractor labor and materials, coordination, and allowances for finishes within the described scope. Your written proposal establishes the actual inclusions. If an item is already included in that proposal, do not add it a second time. Owner-purchased items must also be identified so their cost remains visible in the total budget.
BG Design Build coordinates architectural design, structural engineering, and construction for homes across Hillsborough, Burlingame, San Mateo, Redwood City, and the San Francisco Peninsula. We evaluate the layout, existing structure, and site together, so your early design choices can be considered alongside their construction implications.
For most additions, custom homes, and substantial renovations, the next step after an introductory call is a paid feasibility study. Its scope and fee are agreed in writing before work starts.
No. They are early planning ranges. We need a defined scope, property information, and sufficient design detail to prepare a project-specific proposal.
No. The ranges above describe construction. Design, engineering, consultants, permits, and agency fees should be budgeted separately unless your written proposal expressly includes them.
Yes. A limited renovation with retained systems and finishes is different from a full rebuild of a room. Tell us what you intend to retain and replace so we can assess the appropriate scope.
Share the plans, property location, priorities, and budget. We can review the information available and identify what is needed for the next pricing step.
Tell us where you are building, what you want to change, and your overall investment range. Include any plans, photographs, or surveys you already have.
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