What software engineering actually costs in 2026

Engineering is usually the largest line in a startup's budget and the one founders have the least confidence challenging. That gap is expensive. It is how a £180k build gets signed when the same scope was quoted at £110k down the road, and how a company ends up paying contractor rates for work a permanent hire should have owned.

It is not a knowledge failure. Engineering pricing is one of the few significant business costs a founder is expected to evaluate with no reference points at all. You know roughly what an office costs per desk, and what a good salesperson costs. When a quote for £180,000 lands in your inbox, there is often nothing in your head to measure it against — and suppliers, entirely reasonably, price into that vacuum.

The market is better documented than it feels. UK contract and salary medians are published every month from real job adverts, employer on-costs are set by statute, and agency and offshore ranges vary within bands you can learn in twenty minutes. And 2026 has cooled: median UK developer contract rates and permanent salaries are both down year on year, so if you are hiring or re-contracting right now you have more room than you did eighteen months ago — but only if you know where the market sits.

Start with the number nobody gives you: your cost per engineering day

Every decision here — hire or contract, agency or in-house, London or remote — becomes easy once you have one figure: what a day of engineering actually costs you. The median permanent software engineer salary in London is £95,000, measured from live job adverts over the six months to August 2026. Outside London the median is £65,000, and the UK-wide figure sits at £70,000.

That salary is not the cost. Employer National Insurance runs at 15% on earnings above a £5,000 secondary threshold, and workplace pension auto-enrolment adds a minimum 3% employer contribution on qualifying earnings. Then come equipment, software licences, insurance and recruitment, which commonly runs 15–25% of first-year salary if you use an agency. The standard planning multiplier for a UK employee is 1.25–1.4× base salary in year one, settling to 15–20% above salary once the one-off costs are behind you.

Contractor rates came down, and nobody sent you the memo

The published UK median contract day rate for a developer is £638, and £750 in London, both from live contract adverts over the six months to August 2026. The more interesting part is direction: the UK median is down roughly 18% year on year, while London has held up better at around 3% down. If your mental model of contractor pricing was formed in 2024, it is out of date in the direction that costs you money.

Read those figures next to your £535 in-house day rate and the trade becomes visible. A London contractor at £750 costs about 40% more per day than a permanent engineer of similar seniority, and you are paying that premium for no notice period, no employment risk, and availability next week rather than next quarter. That is excellent value for a specialist on a six-week piece of work, or as cover while you run a proper hiring process. It is poor value as a permanent staffing strategy, and companies drift into exactly that by accident, one renewal at a time.

Two practical notes. Rates vary enormously by seniority — broadly £200–£350 a day at junior level, £350–£550 mid, £550–£850 senior and £800–£1,200 for lead or principal people, with London and the South East above those bands. And if you engage UK contractors, IR35 status determination is your responsibility as the client in most cases; getting it wrong is a tax liability rather than a philosophical debate, so take advice before you sign rather than after.

You are not paying an agency for developers, you are paying for a delivery system

A London agency will typically quote £600–£900 a day for a blended delivery team. Outside London, £350–£550 buys comparable scope. That is a 40–60% spread on identical work, which by itself tells you how much of agency pricing is postcode rather than capability.

Against your £535 in-house day rate the agency looks expensive, and developer-for-developer it is. But a blended rate is not one developer. It typically covers a mix of engineers, some design, some QA and a delivery lead, plus holiday cover, sickness cover, the cost of the person who leaves mid-project, and the recruitment you did not have to run. An agency day is expensive per hour and cheap per unit of risk: you are buying a delivery system that already exists rather than assembling one over six months. For a founder who needs a product in market before the next raise, that can be the correct purchase even at a visible premium.

Where it goes wrong is when the relationship quietly becomes permanent. Twelve months in, you are paying £700 a day for people who are effectively your engineering team, except you do not employ them and do not own the context they have accumulated — and the day they roll off, most of what they know leaves the building. Judge an agency on cost per shipped outcome, not cost per developer-day.

Offshore: the headline rate is not the rate you will pay

Offshore rates are genuinely lower. Current industry ranges put India at roughly $20–$50 an hour and Eastern Europe at around $30–$58, with Poland at the upper end. Against a £750 London contractor day, the arithmetic is dramatic — and incomplete. The consistent guidance across the outsourcing industry itself is that once you add management overhead, onboarding, ramp-up, communication time and attrition, your loaded cost lands somewhere near 1.4–1.8× the headline rate. That still leaves a real saving. It changes the decision from "obviously cheaper" to "cheaper if you can absorb the overhead".

The overhead is specific. Offshore teams execute well against clear specifications and struggle against vague ones, and somebody has to write those specifications, review the output and make the architectural calls. If you have that person, offshore can be genuinely excellent. If you do not, you have outsourced the typing and kept all the hard parts, and the saving evaporates into rework. Offshore scales engineering capacity you already know how to direct; it does not supply engineering judgement you do not have.

The playbook

1. 1
   Write down your true cost per engineering day.

   Take fully loaded annual cost — salary × 1.3 — and divide by about 230 working days. That single number is your yardstick for every quote, contractor rate and build-versus-buy argument you will have this year.

2. 2
   Check the published medians before any rate conversation.

   ITJobsWatch publishes contract and permanent medians by role and region from live adverts. Five minutes there before a negotiation is the highest-return research a founder can do.

3. 3
   Make every quote break out days, roles and rate.

   A quote that says "£140,000" tells you nothing. A quote that says "620 days at a blended £480, across two engineers, a part-time designer and a delivery lead" can be argued with line by line. If a supplier will not break it out, that is the finding.

4. 4
   Price the scope, then price the same scope somewhere else.

   Send identical written scope to a London agency, a regional agency and a senior contractor. You are not shopping for the cheapest — you are calibrating what the work is worth. The spread on identical scope is routinely 40–60%, and that spread is your negotiating position.

5. 5
   Decide what you are buying: capacity or ownership.

   Contractors and agencies buy you capacity. Permanent hires buy you accumulated context and someone who still cares in eighteen months. Mixing the two up is the most expensive mistake in this whole area.

One discipline sits underneath all five: work out what the thing is worth to you before you find out what it costs. If a feature unlocks £400,000 of pipeline, a £90,000 build is a good trade even if the day rate irritates you. If it unlocks a hypothesis, spend a tenth of that and find out. Cost discipline without value context is just haggling — and you do not need to know how to build software to know what it should cost.