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Ask ten agencies what it costs to build a SaaS. You will get ten different answers. Sometimes the highest quote is 8x the lowest one. Founders sit with those quotes on a spreadsheet and cannot tell what is real.
The problem is not that agencies are dishonest. Most are not. The problem is that "SaaS" covers everything from a Bubble prototype to an enterprise platform with SSO, audit logs, and a compliance officer. Quotes without shared scope are just numbers on paper.
I have spent seven years at WhiteStone Infotech scoping, building, and rebuilding SaaS products for founders in the UK, USA, and India. I have written the quotes that founders compare. I have also seen the rebuilds that follow when they pick the wrong one.
This article is the honest answer to "what does it cost." Real cost bands by product type. Where the money actually goes on a build. What usually gets left out of a quote and bills you six months later. What we spent building TrackVid, and what we would do differently.
If you are choosing an agency, you should be able to read this and know what to ask on your next call.
Why SaaS Cost Questions Are So Hard to Answer
Three reasons the same question keeps producing different numbers.
Scope is not a shared word. When you say "SaaS with user management and payments," one agency hears a Stripe checkout and a login form. Another hears role-based access, SSO, audit logs, and a billing engine that handles proration. Both quote against what they heard. Neither is wrong. Neither is the same product.
The category is enormous. A validated MVP for 100 users, a marketplace with seller payouts, a vertical AI SaaS with an eval harness, and an enterprise platform with SOC 2 preparation are all "SaaS". They are not the same build. They are not remotely the same cost.
Different pricing models hide different things. Fixed-price contracts protect you from budget overruns and push the risk of scope creep onto the agency, which means the agency inflates the base to protect its margin. Time-and-materials keeps the base honest but makes the total unpredictable. Both are defensible. Neither is better in a vacuum.
Founders ask "how much" before they have defined "what." That is the loop. The way out is to define what first.
The Real Cost Bands for a SaaS in 2026
Real numbers, based on what a serious build costs today with a mixed onshore-offshore team. All figures in USD. Timelines assume a team that is available on day one, which is often not the case.
MVP for a validated idea: $30k to $60k, 3 to 4 months
Team of 2 to 3 people: one senior developer, one mid developer, a part-time designer and PM. Core feature set only. Basic authentication, one payment integration, one third-party service integration, a barebones admin. Multi-tenant if the roadmap needs it, single-tenant if you can defer that decision.
This is not a prototype. It is a real product you can put in front of 100 paying users. It will have rough edges. That is fine because you are not selling to enterprise buyers yet.
Below $20k is not a real MVP. It is either a Bubble prototype or an offshore student project. Both fail differently.
Standard B2B SaaS v1: $80k to $150k, 5 to 7 months
Team of 3 to 4: senior dev lead, two developers, design, and a PM. Multi-tenant architecture. Standard integrations: payments, transactional email, one CRM, one calendaring service, one auth provider. Admin panel that a support team can actually use. Basic notification system. Onboarding flow that does not embarrass you.
This is the tier most first-time B2B SaaS founders should target. Not the cheapest possible MVP, and not an enterprise-ready platform. Something that works for the first 500 paying customers.
Enterprise-grade B2B SaaS: $200k to $400k, 8 to 12 months
Team of 5 to 6: senior dev lead, three developers, design, PM, part-time DevOps. SSO, granular role-based access, audit logs, GDPR compliance work, SOC 2 preparation if you are in that market. Multiple integrations. Advanced admin, granular billing, audit reporting. Documentation that a customer's IT team will actually read.
If you are selling into an enterprise buyer, you cannot skip most of this. Enterprise procurement will ask for the audit trail on day one of the pilot.
Marketplace or multi-tenant platform: $180k to $350k, 8 to 12 months
Team of 5 or more. Seller and buyer portals. Payment splits, usually on Stripe Connect. Search and discovery. Dispute workflow. Fraud checks. Reconciliation logic between what the platform records and what the payment processor confirms. That reconciliation piece is where marketplaces quietly bleed money.
Vertical AI SaaS: $150k to $300k, 6 to 10 months
Standard SaaS shell plus LLM integration, prompt engineering, an evaluation harness, and a data pipeline for fine-tuning or retrieval-augmented generation. Cost varies more here than in any other category because model choice, evaluation depth, and inference volume all move the number.
McKinsey's most recent SaaS research points out that for every dollar spent on model development, teams tend to spend three dollars on change management and evaluation. Founders forget this line and then find it on the P&L six months after launch.
Where the Money Actually Goes in a SaaS Build
Numbers are useful only if you know what they buy. A rough split for a typical B2B SaaS v1 build:
Product and design: 10 to 15 percent
Frontend development: 20 to 25 percent
Backend and database: 25 to 30 percent
DevOps and infrastructure setup: around 10 percent
Integrations (payments, auth, email, CRM): 8 to 12 percent
Testing and QA: 10 to 15 percent
Project management: 8 to 10 percent
Buffer and rework: around 10 percent
Two things worth naming.
Backend and database is the largest line for a reason. Multi-tenant data isolation, permission logic, background jobs, and the domain model are what make the product work correctly the day a customer actually uses it. Frontend work is more visible but backend is where the failure modes live.
The 10 percent buffer is what dishonest quotes remove to look competitive. Every real build has rework. Requirements shift, a payment provider updates its API, a client changes their mind about a workflow after seeing it on staging. Ten percent buffer is honest. Zero percent buffer is a change-request campaign that will look competitive on day one and cost you an extra 20 to 30 percent by launch.
Developer salary data from the Stack Overflow Developer Survey 2025 shows why these numbers hold. A senior developer costs a UK or US firm meaningfully more than a mid-level one, and blended team rates should reflect that. Beware quotes that assume every hour is a senior hour, and beware quotes that assume every hour is a junior one.
What Usually Gets Underestimated (and Bills You Later)
Six things that keep coming back to bite first-time SaaS founders:
Multi-tenant data isolation. Getting this right takes real design work. Getting it wrong causes a data breach on the day your third customer signs a paid annual contract.
Admin panels. Every SaaS needs one. Nobody scopes them properly at the start. Support teams then work around the gaps with database queries for two years.
Email and notification infrastructure. Transactional email, in-app notifications, digest emails, delivery monitoring, template management. This is a week of work minimum and is almost always missing from cheap quotes.
GDPR and data-residency work. If you are selling in the UK or the EU, you need data-export tools, deletion flows, consent capture, and an internal record of processing. All of it takes engineering time. Most quotes bury it.
Onboarding flow. Treated as an afterthought at scoping. Rebuilt three times in the first year because activation rates are terrible. Design it up front and pay for it up front.
Post-launch bug budget. Every build ships bugs. Serious agencies scope 2 to 4 weeks of dedicated post-launch dev time. Cheap quotes assume zero and then charge for it as change requests.
Documentation. Internal architecture docs, API docs for integration partners, customer help content. Small in isolation. Adds up to two weeks of work by launch.
What We Learned Building TrackVid
TrackVid is our video proof and claim-management platform for ecommerce sellers, primarily in India but now expanding into the UK and USA markets. I led the technical build. Here is the honest cost history.
The initial MVP cost roughly $45k over four months, with two full-time developers, a part-time designer, and me as technical lead. Scope was tight on purpose: order-linked packing video capture, secure retrieval by order ID, and a claim-support workflow. Nothing else. We launched into a paid pilot with a small group of D2C sellers.
Then reality landed. Reconciliation logic between our platform and the marketplace platforms took twice what we had estimated. Multi-marketplace integrations (Amazon India, Flipkart, Snapdeal, and the seller's own storefront) each had their own auth quirks. Video storage costs at scale required a rethink of retention policy. Fraud-detection heuristics took a further two months of iteration.
Post-validation expansion cost us another $60k over three months. That is 130 percent of the initial build cost, on features that most founders would have wanted in v1. If we had scoped everything into v1, we would have taken eight months to launch instead of four, and we would have shipped features nobody asked for.
Two takeaways from that experience.
First, expansion cost usually matches or exceeds initial build cost. If you have $100k in the bank, do not spend it all on v1. Ship a $40k v1 and keep $60k for what you learn.
Second, fixed-scope milestones work if the milestones are small. Two-week milestones with a signed acceptance test at the end kept us honest with our first client and honest with ourselves.
You can see TrackVid alongside our portfolio of shipped SaaS work if you want a look at what a real production SaaS from us looks like.
How to Get an Honest SaaS Estimate
Five things to ask on your next agency call.
Ask for scope in user stories, not features. "As a customer, I can invite a teammate and set their permissions" is a user story. "User management" is a feature. Agencies quote user stories more accurately.
Ask for cost, time, and team composition together. Not "$150k". "$150k over six months with a team of one senior lead, two mid developers, a designer, and a PM." A quote without team composition is a quote you cannot compare.
Ask about the buffer. "What percentage of the build is scoped as buffer for rework?" If the answer is zero, they are either lying or they will bill you the buffer as change requests. Ten percent is honest.
Ask who is actually on the team. Not "our engineers". Names, seniority, and time allocation. Some agencies bid with senior profiles and staff with juniors after the contract is signed.
Ask about the post-launch support model. Warranty period, bug SLA, cost of change requests, cost of handover. If the agency does not want to talk about after-launch, you have your answer about their build philosophy.
Compare quotes at the same scope level, not the same price level. A £40k quote and a £120k quote for "the same product" usually turn out to be quotes for two different products.
Once you have compared quotes on those terms, we would like a shot at yours. Book a fixed-scope estimate call with WhiteStone and we will walk through your scope, team composition, and buffer transparently on the same call.
Frequently Asked Questions
How long does it take to build a SaaS from scratch?
For an MVP, 3 to 4 months with a team of 2 to 3 people. Standard B2B SaaS v1 takes 5 to 7 months. Enterprise-grade platforms with SSO, audit logs, and compliance work take 8 to 12 months. If someone quotes you 6 weeks for a full SaaS build, ask them what they are cutting.
What is the minimum budget for a SaaS MVP in 2026?
Realistic floor for a build worth using is $30k to $40k. Under $20k is either a low-code prototype in Bubble with a founder wrapper, or offshore student work that will need rebuilding within a year. Under $10k is a demo of a prompt strung through Zapier.
Where do first-time SaaS founders always overspend?
Four common patterns: features nobody asked for, premature scale (Kubernetes and microservices in month one), over-designed admin panels for a product with 40 users, and "AI everywhere" without a validated use case for any of it. Cutting these four categories saves 30 to 40 percent on a typical v1 build.
Is offshore development still cheaper end-to-end?
Direct hourly rates for offshore development are 40 to 60 percent lower than UK or US rates. End-to-end economics depend on management overhead. The pattern that works: an offshore build team led by a senior technical lead who understands how to run offshore delivery. A pure offshore team without technical leadership from the client side often costs more all-in than a fully local team.
What is the typical monthly infrastructure cost after launch?
For a small B2B SaaS with under 500 users, $100 to $500 per month covers hosting, database, email, monitoring, and backups. A growing SaaS with 500 to 5,000 users runs $500 to $3,000 per month. A scaling SaaS at 5,000-plus users runs $3,000 to $15,000 per month. AI features (LLM inference, embeddings, vector database) add 30 to 100 percent on top of the base infrastructure cost.
The One Thing to Remember
The price gap between "cheap" and "right" is not $50k. It is whether you ship v2 next year, or spend v2's budget rebuilding v1.
Pick the partner who scopes honestly, quotes what it actually takes, and shows you the buffer on paper. The rest is arithmetic.
If you want that conversation, we are ready for it. Browse our software development services or come straight to the point and book a fixed-scope estimate call.
