templates10 min read•2026-11-05

Webサイト制作の見積提案書テンプレートと料金相場ガイド

Web制作費用の算出方法と追加修正トラブルを防ぐ提案書のポイント

Direct Answer & Overview

A web design proposal outlines the creative scope, technological stack, deliverable timeline, milestone pricing, and intellectual property terms for a website redesign or new build. High-performing agencies and freelancers win projects by framing the proposal around client business outcomes (conversions, brand credibility, speed) rather than mere technical tasks.

Most custom web design projects range from $3,500 to $25,000+ depending on page count, custom animations, and integrations. Below you will find ready-to-copy web design proposal templates, milestone breakdown formulas, and essential client protection clauses.

Key Takeaways

Frame the proposal around business goals (leads, revenue, mobile speed) rather than code languages.
Always include a strict revision policy (e.g., 2 revision rounds per milestone) to eliminate scope creep.
Break project payments into 3 or 4 milestones (40% kickoff, 30% design approval, 30% pre-launch).
Explicitly state what is NOT included (copywriting, custom video production, premium stock licenses).
Offer optional recurring monthly packages (website maintenance, hosting, SEO updates) to secure ongoing retainer revenue.
With Offerlime, clients can approve their web design quote, pick add-ons, and sign the agreement on any mobile device.

Essential phases of a professional web design proposal

Organize your proposal into logical phases so clients understand where their investment goes and how progress is measured:

Phase 1: Discovery & Strategy: Competitor audit, user personas, sitemap hierarchy, and wireframe architecture.
Phase 2: UI/UX Visual Design: High-fidelity Figma prototypes, design system tokens, typography, and interactive component mockups.
Phase 3: Development & CMS: Clean responsive front-end build, CMS integration, fast loading speed, and core SEO metadata.
Phase 4: Testing & Launch: Cross-browser testing, mobile responsiveness audit, analytics integration, and domain DNS pointing.

Ready-to-copy web design proposal template

Use this proposal structure to bid on corporate redesigns, e-commerce builds, and SaaS marketing sites:

Custom website redesign proposal

WEB DESIGN PROPOSAL & SCOPE OF WORK

Client: Horizon Capital Partners | Contact: Marcus Vance, CMO
Agency: Studio Lumina Creative LLC

1. PROJECT OBJECTIVES
Redesign the core corporate website (12 pages) to increase qualified lead inquiries, improve mobile responsiveness, and modernize brand positioning.

2. DELIVERABLES & PHASES
- Phase 1: Sitemap strategy & wireframing (Weeks 1-2)
- Phase 2: High-fidelity desktop & mobile UI design with 2 revision rounds (Weeks 3-4)
- Phase 3: Responsive Next.js development & headless CMS setup (Weeks 5-7)
- Phase 4: SEO setup, speed optimization, and production launch (Week 8)

3. INVESTMENT & MILESTONE SCHEDULE
Total Investment: $8,500.00 USD
- Milestone 1 (Kickoff Deposit): $3,400.00 (40%) upon contract signing
- Milestone 2 (Design Approval): $2,550.00 (30%) upon final Figma sign-off
- Milestone 3 (Final Launch): $2,550.00 (30%) prior to live server deployment

4. OPTIONAL MONTHLY CARE PLAN
[  ] Premium Care Package: $350.00 / month (Cloud hosting, weekly security backups, and 3 hours of monthly content updates)

Accepted by Client: ___________________________ Date: ____________

How to prevent scope creep in web projects

Unclear boundaries kill agency profitability. Include these protective clauses in your proposal:

Revision Caps: 'Each phase includes up to two (2) rounds of revisions. Additional rounds or structural changes after sign-off will be billed at our standard rate of $120/hour.'
Client Delays Clause: 'If client feedback or content delivery is delayed beyond 14 consecutive business days, the project schedule will be paused and subject to a reactivation fee.'
Asset Responsibility: 'Client is responsible for providing high-resolution logo assets, raw photography, and final copy unless added as an optional service.'

Average Web Design Pricing by Project Complexity

Project Tier	Typical Price Range	Timeline	Target Audience
Template Customization / Landing Page	$1,500 – $3,500	1 to 2 weeks	Early-stage startups, single product launch
Custom Business Website (5–12 pages)	$4,500 – $10,000	4 to 6 weeks	Service businesses, professional firms
E-Commerce / Custom Shopify Build	$8,000 – $22,000	6 to 10 weeks	Direct-to-consumer brands, retail
Enterprise / Custom Web Application	$25,000 – $60,000+	10 to 16+ weeks	SaaS platforms, complex API integrations

How to craft a high-converting web design proposal

Identify pain points in the kickoff call

Document what is currently broken on their site: high bounce rates, poor mobile layout, slow page load times, or weak conversion rates.

Structure your 3-phase delivery roadmap

Clearly show what happens during discovery, visual design, and development so the client feels confident in your process.

Add an optional maintenance and retainer upsell

Include ongoing hosting, security patches, and monthly content updates as an optional toggle item.

Send via Offerlime for seamless digital sign-off

Deliver an interactive proposal link allowing the client to review terms, choose optional care plans, and sign digitally on the spot.

Frequently Asked Questions

How much should I charge for designing a website?

Freelancers typically charge $3,000 to $8,000 for a standard 5 to 10 page business website. Agencies typically charge $8,000 to $25,000+ depending on branding depth, custom animations, and headless CMS integrations.

How do I quote website redesigns vs. new builds?

Redesigns require content migration, URL redirect mapping (301 redirects), and preserving SEO authority, so they often take 20% to 30% longer than clean new builds.

Should I charge hourly or fixed-fee for web design?

Fixed milestone pricing is preferred for web design because it ties your earnings to value and quality rather than punishing you for working fast. Always define an hourly rate for out-of-scope requests.

Who owns the website code and design assets?

Standard practice is that the agency or freelancer retains ownership until final payment is settled in full. Once paid, full intellectual property and code rights transfer to the client.

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