STANDARD
INTEGRITY
INSTITUTE

INTERIOR DESIGN / SCOPE COMPARISON

Different design fees?Compare what you’ll receive.

A lower design fee and a higher construction total may cover different work. Lay out the drawings, construction scope, materials and site-management duties before comparing prices.

SII reviews quotation documents. It does not rate designers’ taste, ability or creditworthiness, or choose a provider for you.

COMPARISON SHEET / ILLUSTRATION

One fee label. The same deliverables?

Drawings
Plans, construction details, material schedules
Revisions
Included rounds and design stages
Site work
Coordination, visits and records
Illustrative comparison items, not an actual quote or SII assessment. Confirm each firm’s inclusions in writing.

Three fee headings. Three scopes to clarify.

The fees need not appear on separate invoices. If a service is bundled into construction rates, ask where it is priced and what that price includes.

01 / DESIGN

Design fees

What design work and drawings will you receive?

Compare these deliverables
Measurement, briefing, plans, elevations, 3D views, construction drawings and material schedules. Confirm each stage’s outputs, revision rounds and final file formats.
One more question
Is pricing per area, project or stage? How are additional revisions charged?

02 / CONSTRUCTION

Construction fees

Where does the quoted work begin and end?

Compare these deliverables
Locations, work items, quantities, units, rates, specifications and exclusions. Find protection, demolition, disposal, equipment and making good in the scope too.
One more question
Which quantities are provisional? How are additions priced and omitted work credited?

03 / SITE MANAGEMENT

Site-management fees

Who checks what on site?

Compare these deliverables
Visit arrangements, trade coordination, progress records, material checks, stage inspections and defect follow-up. Identify the responsible person, reporting process and limits.
One more question
What records will you receive? Who handles an issue and follows it through?

Put both proposals through the same six questions.

Give both firms the same brief. Match the work, not just its name. Leave unclear items open for confirmation instead of treating them as included.

01 Are you buying the same service?
Check in both quotes
Who handles design, procurement, construction and management? Is the appointment design-only, design-and-build, or a limited package?
Watch for this mismatch
One firm may supply drawings only; the other may also coordinate construction. Their totals do not represent the same service.
Ask in writing
Please list the included and excluded design, procurement, construction and management duties, identifying who is responsible for each.
02 How far do the drawings and revisions go?
Check in both quotes
Measurement scope, plans, elevations, 3D views, construction details, material schedules and completion documents; delivery stages, formats and revision rounds.
Watch for this mismatch
A 3D view does not establish that construction details are included. Two “design packages” may deliver very different levels of detail.
Ask in writing
Please list each stage’s drawings and files, the included revision rounds, and how additional revisions or design changes will be charged.
03 Do the work, quantities and units match?
Check in both quotes
Locations, scope, quantities, units and rates for demolition, electrical and plumbing work, masonry, joinery, finishes and equipment; include associated work and making good.
Watch for this mismatch
Area, length, pieces, sets and lump sums are not interchangeable pricing units. Ask how the quantities and scope were calculated before comparing rates.
Ask in writing
Please itemise the work by location, with scope, quantities, units, rates and measurement rules. Mark provisional quantities and exclusions, including protection, disposal and making good.
04 Do matching material names mean matching specs?
Check in both quotes
Brands, models, origin, dimensions, thicknesses and hardware. For cabinetry, also check internal fittings, edge finishes and installation.
Watch for this mismatch
“System cabinetry” or “equivalent materials” does not establish identical boards, hardware or installation scope.
Ask in writing
Please provide a material and hardware schedule with brands, models, dimensions or applicable specifications. Explain how substitutions and any price adjustments will be agreed in writing.
05 What does site management actually include?
Check in both quotes
Planned visits, trade coordination, progress reporting, material checks, stage inspections and defect follow-up; name the person handling each duty.
Watch for this mismatch
The same fee label may describe weekly visits or visits at particular stages. It does not tell you how much coordination or follow-up is included.
Ask in writing
Please set out site-visit arrangements, checks at each stage, records provided, and who will receive, resolve and follow up reported issues.
06 How are payments, changes and completion agreed?
Check in both quotes
Deliverables linked to payments, programme, confirmation records, acceptance, defect correction and warranty terms; also additions, omissions and design changes.
Watch for this mismatch
Payment dates or a warranty duration alone do not say what must be delivered, who confirms it or how changes affect the cost.
Ask in writing
Please link payments to deliverables and set out timing, acceptance, defect correction and warranty procedures. Confirm costs and programme effects of additions, omissions and design changes in writing before proceeding.

A price gap is a reason to ask, not a verdict.

Lower total. Better value?

Find what is not included: drawings, management, protection, disposal or equipment. Establish comparable scope before interpreting the difference.

Higher design fee. Overpriced?

Compare drawing detail, revision rounds, material selection and site coordination. The fee alone cannot establish service depth or design quality.

Same joinery label. Same product?

Check boards, thickness, hardware, dimensions, internal fittings, edge finishes and installation. The item name is only a starting point.

No management fee. No cost?

It may be bundled into construction rates—or the service may be excluded. Ask where it is priced and which duties are included.

SII / REQUEST FOR CLARIFICATION

Ask both firms the same questions.

Copy this inquiry and send it separately to each firm with the same brief, space requirements and current drawings. Ask for dated, versioned answers in the quotation or its attachments.

This tool prepares text only. It does not send or store your information, or decide which firm is better.

STANDARD INTEGRITY INSTITUTE
DOCUMENT REVIEW / 04 DIMENSIONS

Still unsure what the revised quote leaves open?

SII reviews documents through four dimensions to identify gaps, conflicting details and useful follow-up questions. Clear wording is not a price appraisal, workmanship guarantee or provider rating.

Transparency

Identifiable services and specifications

Consistency

Quotes, drawings and attachments agree

Reasonableness

Traceable quantities and pricing logic

Executability

Clear duties, payments and confirmation steps

Upload a quote for Free Key Results

Questions about comparing design proposals.

Can I look at the total before checking the details?

Use the total to understand the budget, but not to rank the firms yet. Ask both to clarify services, drawings, work items, specifications and terms. Compare the price difference for equivalent scope. Ask about unlisted items rather than assuming they are free.

Why can two firms quote very different prices for the same home?

Design outputs, drawing detail, revision rounds, construction scope, materials, measurement rules and site-management arrangements can differ. Find those differences first. A price gap alone does not establish which firm is better.

Must design, construction and management fees be separate?

Not every proposal uses the same format. Separate fee lines alone do not make a quote better. What matters is that services, deliverables and pricing can be traced. If a fee is bundled elsewhere, ask the firm to identify where and explain the inclusions.

What should I ask about site-management fees?

Ask about visits, trade coordination, material and stage checks, records provided and responsibility for defect follow-up. A percentage fee or a visit count alone does not define the full scope or its limits.

How do I compare quotes with different work-item names?

Match items by location and actual work, then compare scope, quantities, units and specifications. Ask the firms to explain unmatched items. Similar labels do not prove identical work, and unclear units should not be converted without the pricing basis.

Can SII identify the best interior designer?

No. SII reviews documents, not a designer’s or contractor’s taste, ability, creditworthiness or workmanship. You still need to consider design suitability, communication and delivery arrangements separately. Legal and engineering questions require the relevant professional advice.

General document-reading and inquiry guidance only. No legal, engineering, price-appraisal or on-site supervision conclusions are provided.

© 2026 Standard Integrity Institute (SII). All rights reserved.

This report and the website content are intended solely as strategic reference for pricing and contract negotiations, and do not constitute formal legal endorsement.

© 2026 Standard Integrity Institute (SII). All rights reserved.

This report and the website content are intended solely as strategic reference for pricing and contract negotiations, and do not constitute formal legal endorsement.