Short Answer
A website development specification is a document that records the project goal, page structure, functionality, design requirements, CMS, content, SEO, integrations, responsiveness, testing, and launch. A good specification helps the contractor estimate timeline and budget more accurately, while helping the client understand exactly what will be delivered.
At rgbweb.studio, we treat the specification as a project map. It does not have to be an 80-page bureaucratic document, but it should record all decisions that affect development: which pages we build, which user scenarios are needed, who prepares content, which integrations are connected, and what counts as a finished result.
| Specification section | What we record |
|---|---|
| Website goal | Leads, sales, presentation, catalog, service, automation |
| Audience | Who will use the website and what matters to them |
| Structure | Sections, pages, templates, language versions |
| Functionality | Forms, filters, account, cart, payment, integrations |
| Design | Style, references, brand book, responsive versions |
| CMS | What the client can edit independently |
| Content | Who prepares texts, photos, products, cases, translations |
| SEO | URLs, metadata, headings, indexing, technical foundation |
| QA and launch | What we test, who provides access, how the release works |
If you want to collect the initial materials first, start with the topic What to Prepare Before Website Development. And if you need to understand the full project path, see Website Development Stages: From Idea to Launch.
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Why a Website Development Specification Is Needed

A specification is not needed to make the project start more complicated. It is needed so that all participants understand the task in the same way. Without a specification, the client may expect one thing, the designer another, the developer a third, and the final estimate may start growing during the process.
In our projects, a specification helps:
- estimate the budget more accurately;
- define realistic deadlines;
- reduce the number of reworks;
- record the scope of work;
- separate mandatory functionality from ideas for later;
- approve design and development faster;
- understand in advance who prepares content;
- avoid disputes before launch.
Simply put, a specification turns the idea “we need a website” into a clear action plan. That is why it directly affects time and cost. This connection can be explained in detail in the article How Long Website Development Takes.
As an external reference for working with requirements, you can use ISO/IEC/IEEE 29148:2018: the standard describes requirements engineering processes and helps treat a specification not as a formality, but as a set of verifiable requirements for the future product.
Brief or Website Specification: What Is the Difference

A brief helps understand the client’s task. A technical specification records exactly how that task will be implemented. These are different documents, and one does not replace the other.
| Criterion | Brief | Specification |
|---|---|---|
| Goal | Collect input about the business and task | Record the scope of work and requirements |
| When it is used | At the beginning of communication | After initial analytics and discussion |
| Who fills it in | The client together with the manager or team | The project team together with the client |
| What it contains | Goals, audience, competitors, references, wishes | Structure, pages, functions, CMS, integrations, content, QA |
| How it affects the project | Helps evaluate the direction | Helps estimate timeline, budget, and result |
A brief answers the question “what does the business want to get”, while a specification answers “how exactly will we do it”.
At rgbweb.studio, we often start with a brief, then clarify the task and turn the input into a working specification. This is a normal process: the client does not have to come with a finished technical document, but important decisions should be recorded before active development begins.
Website Development Specification Structure
The website development specification structure should be detailed enough for the team to estimate the project, but not overloaded with unnecessary theory. We recommend including 12 sections.
1. General Project Information
In this section, we record:
- company name;
- niche and geography;
- a short description of the product or services;
- the current website, if there is one;
- the reason for creating or redesigning the website;
- main limitations in timeline and budget.
2. Website Goals
The website goal must be specific. Not “make a modern website”, but:
- generate leads;
- sell products online;
- present the company;
- explain a complex service;
- build a catalog;
- automate appointment booking;
- support advertising;
- develop SEO.
If the goal is not recorded, it is difficult to evaluate the quality of the finished result. A website may be beautiful but fail to solve the business task.
3. Target Audience
The specification should describe who the website is created for:
- who makes the decision;
- what questions the user has before purchase;
- which objections need to be addressed;
- what matters for trust;
- which devices are used more often;
- which languages are needed.
For a B2B website, it is important to show expertise, cases, and reliability. For an online store, it is a convenient catalog, filters, payment, and delivery. For a landing page, it is fast understanding of the offer and a path to the lead form.
4. Website Structure
Structure is the site map. It records sections and pages.
Example structure:
- Home;
- About company;
- Services;
- Service page;
- Cases;
- Case page;
- Blog;
- Article;
- Contacts;
- Privacy policy.
It is important to count not only the number of pages, but also the number of unique templates. 30 pages based on 5 templates and 8 completely different pages are different amounts of design, markup, and testing.
5. Functional Requirements
In this section, we describe what the website must be able to do.
For example:
- lead form;
- quiz;
- cost calculator;
- search;
- filters;
- catalog;
- cart;
- payment;
- delivery;
- personal account;
- subscription;
- CRM integration;
- email/SMS notifications;
- multilingual functionality;
- data import/export.
Functionality is one of the main budget factors. If it is not described in advance, the project will almost inevitably start expanding after kickoff.
If the project includes forms, a personal account, payment, an admin panel, or integrations, the requirements should include basic security expectations. For this, you can use OWASP Top 10 as a list of key web risks that the team should consider during design and development.
6. Design Requirements
The specification should state:
- whether there is a brand book;
- which colors and fonts to use;
- which websites you like and why;
- which websites you do not like;
- whether a strict corporate style or a more emotional presentation is needed;
- whether animations are needed;
- which versions are needed: desktop, tablet, mobile.
References help, but it is important to explain exactly what you like in them: structure, mood, visual clarity, animations, case presentation, product cards, or forms.
If different groups of people will use the website, it is useful to add interface accessibility to the design requirements. The W3C WCAG 2.2 standard can serve as a reference because it describes testable requirements for the perceivability, operability, understandability, and robustness of web content.
7. CMS and Administration
The specification should record what the client must be able to manage after launch.
For example:
- edit texts and images;
- add services;
- publish articles;
- add cases;
- manage products;
- change prices;
- process leads;
- create users;
- edit SEO metadata.
If this is not described, the website may look finished but be inconvenient for the client’s team.
8. Content
Content often delays a project. That is why the specification should state:
- who writes the texts;
- who prepares photos and videos;
- who migrates content;
- how many pages need to be filled;
- whether translations are needed;
- who prepares products for the catalog;
- whether SEO texts are needed;
- who approves materials.
If content is not ready, this must be considered in the timeline. The preparation of materials should be covered in more detail in the article What to Prepare Before Website Development.
9. SEO Requirements
Basic SEO preparation is not the same as SEO promotion, but it is important to include it in development.
The specification can include:
- URL structure;
- title and meta description;
- H1-H3;
- sitemap.xml;
- robots.txt;
- structured data;
- redirects;
- loading speed;
- indexing;
- analytics connection.
If the website should receive organic traffic, SEO structure should be considered before design and markup, not after launch.
For basic SEO preparation, Google SEO Starter Guide remains a reliable reference: it helps account in advance for indexing, page structure, metadata, content, and technical website requirements.
10. Integrations
Integrations should be described as specifically as possible:
- which CRM is used;
- which data is transferred;
- which fields are required;
- whether payment integration is needed;
- which delivery services are connected;
- whether warehouse accounting exists;
- whether email/SMS notifications are needed;
- which events are sent to analytics.
The phrase “connect CRM” is too general. For an estimate, it is necessary to understand which data is transferred, in which direction, and under what conditions.
11. Testing
The specification should describe what will be checked before launch:
- responsiveness;
- forms;
- email sending;
- integrations;
- cart and checkout;
- speed;
- browsers;
- 404 errors;
- content correctness;
- analytics;
- indexing.
Visual assessment alone is not enough to evaluate a finished website. This can be explained in more detail in the material How to Evaluate the Quality of a Finished Website.
For performance testing, the specification can define Core Web Vitals metrics in advance: LCP, INP, and CLS. This helps discuss speed not abstractly, but through measurable user experience indicators.
12. Launch and Support
The final section of the specification should record:
- who provides the domain and hosting;
- who configures SSL;
- who migrates the website;
- who connects analytics;
- who transfers access;
- whether training is included;
- whether there is a warranty period;
- which improvements are considered separate work.
This reduces the risk of misunderstanding at the most tense moment: before release.

Specification for a Corporate Website
A specification for a corporate website may include the following requirements:
| Section | What to specify |
|---|---|
| Goal | Generate leads, present the company, strengthen trust |
| Pages | Home, services, service, cases, case, about company, blog, contacts |
| Functions | Lead forms, callback, subscription, case filter |
| CMS | Editing services, cases, articles, employees, reviews |
| Content | Service texts, team photos, cases, client logos |
| SEO | Service URLs, meta tags, heading structure, blog |
| Integrations | CRM, email notifications, analytics |
| Languages | Russian, Ukrainian, English – if needed |
| QA | Checking forms, responsiveness, speed, metadata |
For a corporate website, it is important to define in advance which sections will develop after launch. For example, if the company plans to run a blog or regularly add cases, this should be included in the CMS.
Specification for an Online Store
A specification for an online store should be more detailed than a specification for a regular corporate website. An online store is not just pages, but a sales system.
| Section | What to specify |
|---|---|
| Catalog | Categories, subcategories, product cards |
| Products | Name, price, photo, description, characteristics, availability |
| Filters | Price, brand, size, color, characteristics |
| Cart | Adding, quantity changes, removal, promo codes |
| Checkout | Contacts, delivery, payment, order comment |
| Payment | Which payment systems are connected |
| Delivery | Nova Poshta, courier, pickup, international delivery |
| Personal account | Order history, user data, favorites |
| CRM/warehouse | Which data is transferred and how stock balances are updated |
| Notifications | Email/SMS to the client and manager |
| SEO | Categories, filters, product cards, product structured data |
| Analytics | Ecommerce events, goals, conversions |
The main mistake in an online store specification is writing “catalog, cart, payment” without details. For an estimate, it is necessary to understand how many products there will be at launch, how stock balances are updated, which delivery and payment options are needed, who fills the catalog, and how orders are processed.
rgbweb.studio Methodology: How We Create Specifications
At rgbweb.studio, we start with a brief, ask clarifying questions, analyze business goals, and gradually turn the input into a working document.
Our methodology consists of 5 steps:
- Analyze the business task. What the website should change: increase leads, explain a service, replace an old resource, launch sales, automate a process.
- Define user scenarios. How a person gets to the website, what they see first, which arguments they receive, where they leave a request or make a purchase.
- Build the structure. Which pages and templates are needed for the first release, and what can be added later.
- Record functionality. Forms, catalog, filters, payment, account, integrations, CMS, analytics.
- Separate must-have and later. What is mandatory for launch, and what can be moved to the next stage.
This approach helps make the specification not a formality, but a working tool for the project. It becomes the basis for estimating timeline, budget, and result quality.
Common Mistakes When Writing a Specification

A poor specification almost always leads to extra approvals, reworks, and conflicting expectations. We most often see these mistakes:
| Mistake | What happens |
|---|---|
| No website goal | It is impossible to understand what should count as the result |
| Only pages are described | User scenarios and functions are unclear |
| No content | Deadlines shift after design has already started |
| Integrations are described in one line | Development turns out to be more complex than estimated |
| CMS is not defined | After launch, the website is inconvenient to edit |
| Languages are not specified | Multilingual functionality is added late and changes the structure |
| No revision rules | Approvals drag on |
| Launch is not described | Problems arise with access, domain, and hosting |
If this topic needs to be explored more deeply, it is logical to move to the article Common Mistakes When Ordering a Website. There, you can explain how mistakes at the start affect the budget, timeline, and quality of the finished website.
rgbweb.studio’s Opinion
In our experience, a good specification should not be written in complicated technical language. It should be clear to the business, designer, developer, SEO specialist, and project manager. If five people read the document and each understands it differently, it is not a specification, but a source of future disputes.
We believe a strong specification answers three questions:
- what we are building;
- why the business needs it;
- how we will understand that the result is ready.
At the same time, a specification should not turn the project into concrete. New ideas may appear during development, but it is important to separate changes: what is needed for the first launch and what can be moved to the second stage. This approach helps launch the website faster and avoid inflating the budget without necessity.
If you are planning website development for business and want to see the whole process, start with the material Complete Guide to Website Development for Business. It will help connect the specification, stages, cost, timeline, quality, and website development after launch.
FAQ
What should a website specification include?
A website specification should include the project goal, audience, page structure, functionality, design requirements, CMS, content, SEO, integrations, responsiveness, testing, launch, and support. The more accurately pages, scenarios, and responsibilities are described, the more accurate the timeline and estimate will be.
How do you write a website development specification?
To write a website development specification, start with the goal, audience, and structure. Then describe pages, functions, forms, CMS, integrations, content, SEO requirements, responsiveness, testing, and launch. After that, divide functions into mandatory ones and those that can be done later.
What is the optimal structure for a website development specification?
The optimal structure of a website development specification includes 12 blocks: general information, goals, audience, website structure, functionality, design, CMS, content, SEO, integrations, testing, launch, and support. For an online store, catalog, cart, payment, delivery, and orders are additionally needed.
Can development start without a specification?
It can, if the project is very simple, but the risk of rework will be higher. For a business, it is better to at least record structure, functions, content, CMS, integrations, and readiness criteria. Even a short specification reduces uncertainty and helps manage timeline and budget.
Conclusion
Now you know how to write a website development specification and why it affects timeline, cost, and result quality. A good specification does not complicate the project, but makes it clear: what we are building, why, in what scope, and how readiness will be checked.
If you already have a website idea but no specification structure, rgbweb.studio can help run a short diagnosis, collect requirements, separate mandatory functionality from secondary features, and prepare a foundation for an accurate project estimate.



