Most suppliers estimate their addressable market in UK public procurement using guesswork: a rough percentage of total public spend, adjusted for “fit.” This approach leaves money on the table and misses critical renewal windows. A mid-sized IT services supplier recently discovered that 40% of their initial addressable market estimate was actually non-addressable once they filtered for frameworks they didn’t participate in and excluded single-supplier exemptions. They were chasing opportunities they could never win.
The challenge is real. Without visibility of contract end dates, renewal cycles, and framework structures, suppliers lack the foundation for accurate market planning. You’re bidding blind on where the real opportunities are, how much spend will reappear, and when. This gap between guesswork and data-driven planning is where many suppliers lose competitive advantage—and where mid-sized and larger established firms often struggle most.
This guide walks you through a structured methodology to quantify your total addressable market (TAM) in UK public procurement. You’ll learn the formula, how to segment by buyer and framework, how to forecast renewal cycles, and how to validate your totals. By the end, you’ll have a defensible, data-driven TAM model that guides resource allocation and pipeline planning. Let’s start with the fundamentals.
What is Total Addressable Market in UK Public Procurement?
Total Addressable Market is the total annual spend across public sector buyers that your organisation could realistically win, given your capabilities, geography, and sector focus. It’s not the entire market—it represents the available market that your organisation can serve, as opposed to the whole public sector market, which may include segments you cannot realistically target.
This distinction matters. A supplier offering facilities management services might find that 30% of total public sector FM spend is non-addressable because it’s reserved for SMEs, managed in-house, or falls outside their geographic scope. That’s not a failure of the market; it’s a reality of how UK public procurement works.
The total available market (TAM) represents the theoretical maximum revenue opportunity if a company could serve the entire market without any limitations. Market segmentation helps identify specific markets and target markets within the broader public sector, making TAM estimates more realistic and actionable by focusing on the available market rather than the entire market.
TAM differs from SAM and SOM:
- TAM (Total Addressable Market): All spend you could bid on (e.g., £50M across all IT services contracts in England)
- SAM (Serviceable Available Market): Also known as serviceable available market, SAM represents the portion of the total addressable market that you can realistically serve with current resources, considering factors like geography and operational constraints (e.g., £15M if you focus on local authorities only)
- SOM (Serviceable Obtainable Market): Your realistic win rate in year one (e.g., £2M if you win 15% of SAM). SOM is the actual share of the market expected to be captured in the next 3–5 years, factoring in competition and budget.
TAM is strategic; SAM and SOM are operational. You need all three to build a credible plan.
Why TAM differs in UK public procurement:
Frameworks fragment the market. A single framework might represent £100M of spend, but you can only bid on it if you’re eligible. If you’re not on the framework, that spend is non-addressable. Lots create sub-markets and customer segments: a framework might have 10 lots; you might be eligible for only 3. The other 7 lots are non-addressable. When calculating total addressable market, only the sub-markets and customer segments relevant to your company’s products and product offerings should be included, as these define the realistic market you can serve. Statutory buying rules apply: some buyers have in-house capability and rarely open to market. Some contracts are reserved for SMEs or social enterprises. These are non-addressable.
Regional variation matters too. Some suppliers operate only in specific regions; spend outside those regions is non-addressable. This is why calculating TAM requires discipline: you must distinguish between spend you could theoretically bid on and spend you actually can bid on.
The Total Addressable Market Formula for UK Public Procurement
Here’s the practical formula:
TAM = Σ (Annualised Award Value) across [CPV categories] × [Buyer types] × [Regions] × [Frameworks] MINUS [Non-addressable spend]
When estimating market size and validating your TAM calculations, it’s valuable to use industry data, market reports, and industry reports. These sources, along with market data from financial reports and research studies, provide authoritative figures and benchmarks for your calculations.
Let’s break this down:
Annualised Award Value: Convert multi-year contracts to annual equivalents. A 3-year £300k contract = £100k/year. This is critical because multi-year contracts distort TAM if not annualised. A 5-year contract worth £500k should count as £100k/year, not £500k. Using comparable products and annual contract value can further improve the accuracy of TAM estimates, especially in subscription or SaaS markets.
CPV categories: Product/service categories using the official CPV classification (e.g., 72000000 = IT services, 90000000 = Sewage, refuse, waste, water services). Identify which CPVs represent your highest-value opportunities. Population data and research studies can help estimate the number of potential buyers in each segment.
Buyer types: Central government, local authorities, NHS, education, housing, devolved administrations. Each has different procurement rules and renewal cycles. Population data and research studies can help estimate the number of potential buyers in each segment.
Regions: Geographic areas where you operate. If you don’t operate in a region, exclude spend in that region.
Frameworks: Specific frameworks you’re eligible for (G-Cloud, DPS, regional frameworks, etc.). If you’re not on a framework, that spend is non-addressable.
Non-addressable spend: Subtract contracts you can’t bid on—single-supplier exemptions, in-house awards, specialised lots outside your scope, niche geographies.
Top-Down vs. Bottom-Up TAM Calculation
Two approaches exist:
Top-down approach: Start with total public sector spend by category (macro-level), apply your addressability filters. Pros: Quick, uses published budget data. Cons: Less accurate, harder to validate. When to use: Initial estimates, competitive analysis, board-level reporting.
Bottom-up approach: Aggregate award-by-award from published notices, then sum by segment. Pros: Accurate, defensible, audit-ready. Cons: Time-consuming, requires clean data. When to use: Strategic planning, resource allocation, detailed forecasting.
Most suppliers benefit from a hybrid: use top-down for initial estimates, validate with bottom-up sample data.
Normalising Values in TAM Calculation
Data quality is non-negotiable. Garbage in, garbage out. Conducting thorough market research and using accurate market data and industry data are essential to ensure reliable total addressable market (TAM) calculations.
De-duplication: A single contract might be listed under multiple CPVs or buyer names. Identify and remove duplicates by checking contract ID, buyer name, contract value, and start date.
Non-addressable exclusions: Remove single-supplier exemptions, in-house awards, specialised lots outside your scope. Document your exclusion rules clearly.
Contract extensions: Adjust for known extensions or re-procurements to avoid inflating TAM.
Fiscal year reconciliation: Align to calendar or fiscal year depending on your planning cycle.
VAT considerations: Public sector spend is typically quoted ex-VAT in award notices. If you’re comparing your pricing (which includes VAT) to award data (which excludes VAT), adjust accordingly. Example: Award value £100k ex-VAT = £120k inc. VAT (at 20%).
Note: Using a bottom-up approach for TAM involves analysing internal data, conducting primary research, and focusing on specific customer segments, rather than relying solely on broad third-party industry reports.
Segment Your Total Addressable Market by CPV, Buyer Type, and Region
A single TAM number is useless for strategy. You need to know which segments are high-value, high-frequency, and winnable. Market segmentation is essential for breaking down the total addressable market into distinct groups, helping you define customer profiles and identify customer needs. This enables more accurate TAM estimates and better targeting.
CPV segmentation: Which product/service categories represent your highest-value opportunities? Calculate TAM by CPV. Example: “IT services (CPV 72) = £20M TAM; Facilities management (CPV 90) = £15M TAM; Professional services (CPV 79) = £15M TAM.” Through segmentation analysis, you may uncover new customer segments or identify small businesses as potential high-value targets.
Buyer type segmentation: Local authorities, NHS, central government—each has different procurement processes, budgets, and renewal cycles. Example: “Local authorities = £25M TAM; NHS = £15M TAM; Central government = £10M TAM.”
Regional segmentation: Where is your largest addressable market? Example: “South East = £20M TAM; London = £15M TAM; Midlands = £10M TAM; Other = £5M TAM.”
Framework segmentation: Which frameworks represent your largest opportunities? Example: “G-Cloud = £15M TAM; Regional DPS = £20M TAM; Direct awards = £15M TAM.” Framework participation is a prerequisite for bidding; if you’re not on a framework, that spend is non-addressable.
Create a segmentation matrix showing TAM by CPV × Buyer Type × Region × Framework. This becomes your strategic planning tool. Use it to identify “sweet spot” segments: high TAM, high win probability, good margins.
Excluding Non-Addressable Spend from Your Addressable Market
Keep TAM realistic by removing non-addressable spend:
When refining your total addressable market, it’s important to consider alternative solutions and the competitive landscape, as these factors impact your ability to capture market share. Excluding non-addressable spend ensures your TAM estimate reflects realistic opportunities.
- In-house awards: Some buyers have in-house capability and rarely open to market. Exclude these.
- Single-supplier exemptions: Some contracts are awarded without competition. Exclude these.
- Specialised lots: Some framework lots are reserved for SMEs, social enterprises, or specific sectors. If you don’t qualify, exclude them.
- Niche geographies: If you don’t operate in a region, exclude spend in that region.
- Reserved contracts: Some contracts are reserved for specific supplier types (charities, cooperatives). Exclude if you don’t qualify.
Overstated TAM undermines credibility with finance teams and leadership. It’s better to underestimate and over-deliver than to overestimate and disappoint.
Build Your Dataset for UK Public Procurement TAM
Accurate TAM depends on reliable, structured data. What do you need?
Current and historic award notices: Who won contracts, when, and for how much?
Contract values and durations: What was the contract worth? How long is it? (Source: Award notices, framework portals)
Contract end dates: When do contracts expire? (Source: Award notices, framework portals, buyer websites)
Framework participation: Which frameworks are you eligible for? (Source: Framework portals, buyer websites)
Pipeline visibility: What re-procurements and framework renewals are coming? (Source: Procurement plans, buyer websites, market engagement notices)
Monitor market trends and use up-to-date market data and industry data: Tracking current and emerging market trends, and incorporating the latest information from market reports and research studies, can significantly improve the accuracy of your TAM dataset.
Standardise your data: Use the official CPV classification system. Resolve inconsistencies—standardise buyer names (e.g., “London Borough of Hackney” vs. “Hackney Council”). Handle missing data: if contract end dates are missing, estimate based on typical contract durations or ask the buyer directly.
Create a data dictionary: Define what “addressable” means for your organisation. Example: “Contracts >£50k in IT services in England, on G-Cloud or regional DPS frameworks.” Document exclusion rules: “Exclude single-supplier exemptions, in-house awards, contracts with incumbent >3 years.” This ensures consistency and auditability.
Data quality checks: Validate contract values—are they realistic for the service type? Check for duplicates. Verify buyer names for consistency. Confirm CPV codes are correct.
Step-by-Step Total Addressable Market Calculation Workflow
Follow this workflow to calculate TAM end-to-end:
Step 1: Define scope. Decide which CPVs, buyer types, regions, and frameworks are addressable. Document your scope: “IT services (CPV 72) in England, on G-Cloud or regional DPS frameworks, contracts >£50k.” This is your filter for all subsequent steps. Defining your potential market and identifying potential customers is the foundation for TAM calculation.
Step 2: Map CPVs. Identify all relevant CPV codes using the CPV classification tool. Example: IT services includes CPV 72000000, 72100000, 72200000, etc. Document all CPVs in a spreadsheet.
Step 3: Gather award values. Pull all awards matching your scope from the past 2–3 years. Create a spreadsheet with: Contract ID, Buyer, CPV, Award Value, Contract Start Date, Contract End Date, Framework (if applicable).
Step 4: Annualise multi-year contracts. For each contract, divide total value by contract duration in years. Example: 3-year contract worth £300k = £100k annualised. Create a new column: “Annualised Value.”
Step 5: Remove non-addressable spend. Apply your exclusion filters: single-supplier exemptions, in-house awards, specialised lots you’re not eligible for, niche geographies. Create a new column: “Addressable?” (Yes/No). Sum only the “Yes” rows.
Step 6: Add visible pipeline. Include re-procurements and framework renewals you know are coming. Source: Procurement plans, market engagement notices, framework renewal dates. Estimate value based on historical awards. Add to your spreadsheet with a flag: “Pipeline” (Yes/No).
Step 7: Sum by segment. Aggregate by CPV, buyer type, region, and framework. Create pivot tables or summary tables showing TAM by each dimension. Aggregating by segment helps estimate potential revenue, revenue opportunity, and maximum revenue opportunity.
Step 8: Validate totals. Cross-check against sector budgets. Does your calculated TAM align with published sector budgets? Check year-over-year trends. Does TAM grow/shrink in line with sector trends? Investigate outliers. If one buyer represents >20% of TAM, validate that award data is correct. Document assumptions.
Practical example: A mid-sized IT services supplier calculates TAM as follows:
- Total IT services awards in England (past 2 years): £100M
- Annualised: £50M/year
- Minus single-supplier exemptions (10%): £45M
- Minus in-house awards (5%): £42.75M
- Minus contracts with incumbent >3 years (15%): £36.3M
- Plus visible pipeline (framework renewals): +£5M
- Final TAM: £41.3M
In this example, the final TAM represents the total market demand and the absolute maximum revenue opportunity if all potential customers are captured.
Expanding into new customers and international markets can increase your TAM and open up additional growth opportunities.
Forecasting TAM Over Time in UK Public Procurement
Static TAM is a snapshot. It doesn’t tell you when opportunities will arise. Spend becomes contestable at specific windows: contract end date plus notice period (typically 6–12 months before). Time-phased TAM shows you when your addressable market becomes available for bidding. Understanding market dynamics—such as industry shifts, market growth, and competitive behavior—is essential for accurate TAM forecasting and strategic planning.
Build a time-phased view:
For each contract in your TAM, identify the contract end date. Calculate the tender publication date: typically 6–12 months before contract end date (varies by buyer). Create a timeline showing when each contract becomes contestable. Aggregate by month/quarter to see when tender activity peaks.
Example timeline:
- Contract End Date: 30 June 2027
- Tender Publication Date: Q4 2026 or Q1 2027 (6–12 months before)
- Tender Deadline: Q2 2027 (typically 4–6 weeks after publication)
- Contract Award: Q3 2027
- New Contract Start: 1 July 2027
Identify seasonal patterns: Some quarters see more re-tenders than others. Q4 often sees higher activity due to fiscal year planning. Q1 often sees lower activity due to budget constraints. Document these patterns for your sector/buyer type.
Model renewal surges: If 30% of your TAM renews in Q2, you need capacity to bid on all renewals. If you don’t have capacity, prioritise high-value opportunities. Use time-phased TAM to plan hiring, partner engagement, and bid team allocation.
Venture capital investors often use TAM forecasts to evaluate a business’s potential return on investment (ROI) and growth prospects.
Critical Planning Window: March 2025 Expiry Surge
From procurement market analysis conducted by Tracker Intelligence in April 2026, 8.2% of award value sits in framework notices for the first time—a structural shift signalling increased framework volatility. This trend is expected to accelerate, meaning suppliers must monitor framework renewal timelines 8–12 weeks in advance. Those without proactive renewal tracking risk losing visibility of major re-procurement windows entirely. This urgency is particularly acute in sectors like construction and retrofit, where integrated frameworks bundle consultants and contractors into single procurement cycles. Missing a single framework entry creates a 3–5 year revenue window where you cannot compete on that buyer’s work.
Renewal Curves and Procurement Schedule Alignment
Model when your addressable spend becomes contestable: contract end date minus 6–12 months = tender publication date. This is when you should start preparing your bid.
Align with your procurement schedule. Do you have capacity to bid on all renewals, or must you prioritise? Create a quarterly procurement plan: “Q1: 5 bids, Q2: 8 bids, Q3: 3 bids, Q4: 6 bids.” Allocate resources accordingly.
Identify high-concentration windows. If 30% of your TAM renews in Q2, plan resources accordingly. Consider hiring temporary bid support or engaging partners.
Spot framework renewal windows. Framework agreements typically renew every 3–5 years. Mark these on your calendar. Plan renewal bids 12 months in advance.
Validate Your Total Addressable Market Analysis with Triangulation
TAM is a strategic number that influences resource allocation and investment decisions. If your TAM is wrong, your strategy will be wrong. Validation builds executive confidence and ensures auditability. Validating your TAM analysis with tam data, research studies, industry data, and market reports ensures accuracy and credibility.
Lens 1: Award rollups vs. budget lines. Compare your calculated TAM (from award data) against published sector budgets. Example: “Our calculated IT services TAM is £41M; published central government IT budget is £150M. Our TAM represents 27% of central government spend, which seems reasonable given our scope (England only, specific CPVs).” If there’s a large discrepancy, investigate: Are you missing data? Are your exclusion filters too aggressive?
Lens 2: Central vs. local splits. Is the ratio of central to local spend realistic for your sector? Example: “In IT services, central government typically represents 40% of spend, local authorities 35%, NHS 15%, education 10%. Our TAM split is 38% central, 37% local, 15% NHS, 10% education—which aligns with sector norms.” If your split is significantly different, investigate why.
Lens 3: Year-over-year trend consistency. Does your TAM grow/shrink in line with sector trends? Example: “Our IT services TAM grew 8% year-over-year, which aligns with sector growth of 7–9%.” If your TAM is growing much faster or slower than the sector, investigate.
Lens 4: Incumbent Concentration & Competitive Positioning
As a fourth validation check, map the top 3–5 incumbent suppliers in your TAM segments. If one incumbent holds >60% of awards in a segment, validate whether this reflects genuine market dominance or incomplete award data. High incumbent concentration can signal:
- Tight framework eligibility (few suppliers qualified)
- Long contract durations (one supplier holds multiple years of spend)
- Relationship entrenchment (buyer preference for proven supplier)
This insight transforms TAM from a spend forecast into a competitive strategy tool—identifying where you have realistic entry points vs. where you should conserve effort. For example, if a single incumbent holds 70% of local authority IT services awards, you might deprioritise that segment and focus instead on NHS or central government, where competition is more distributed and entry barriers lower.
Investigate large outliers. If one buyer represents >20% of your TAM, validate that award data is correct. Check: Is this buyer really that large? Are there duplicate records? Are you missing competitors?
Document assumptions. Make clear which exclusions and adjustments you’ve applied. Example: “We excluded single-supplier exemptions (10% of total awards) because these are non-competitive. We excluded in-house awards (5%) because the buyer has internal capability.” This ensures transparency and auditability.
Turn TAM into Strategy: Prioritising Segments in UK Public Procurement
TAM is a starting point, not an end point. A large TAM doesn’t guarantee success if the market is highly competitive or if you lack capabilities. A small TAM can be highly profitable if you have a competitive advantage. Use TAM to inform strategy, not to dictate it.
Identify high-value segments: Which CPVs have the largest TAM? Which have the best margins? Example: “IT services TAM is £20M with 25% margins; facilities management TAM is £15M with 10% margins. We should prioritise IT services.” Focus resources on high-TAM, high-margin segments.
Identify high-frequency re-tenders: Which CPVs/buyers have annual or bi-annual renewals? High-frequency re-tenders are easier to win repeatedly; you can build relationships and improve your bid over time. Example: “Local authority IT services contracts typically renew every 2–3 years. This is a high-frequency segment where we can build momentum.”
Identify concentrated buyer clusters: If 5 buyers represent 40% of TAM, invest in relationship-building with those buyers. Develop account plans, attend their procurement events, and build executive relationships. Example: “The top 5 local authorities in our region represent £15M of our £41M TAM. We should have dedicated account managers for each.”
Identify favourable frameworks: Some frameworks have lower competition or better terms. Prioritise participation in frameworks where you have a competitive advantage. Example: “Regional DPS frameworks have lower competition than G-Cloud. We should prioritise regional DPS participation.”
Define resourcing and partnerships: Use TAM to decide where to hire, which partners to engage, which geographies to expand into. Example: “Our TAM in the South East is £15M; in the Midlands it’s £8M. We should hire a business development manager for the South East and consider a partnership in the Midlands.”
Create a prioritisation matrix: Plot TAM size vs. win probability to identify “sweet spot” segments.
- High TAM + High win probability = Invest heavily
- High TAM + Low win probability = Invest to improve win probability
- Low TAM + High win probability = Maintain
- Low TAM + Low win probability = Avoid
Practical example: A mid-sized IT services supplier uses their £41.3M TAM to create a prioritisation matrix:
- Invest heavily: Local authority IT services (£15M TAM, 35% win probability) = Sweet spot
- Invest to improve: Central government IT services (£16M TAM, 15% win probability) = High TAM but low win probability; need to improve positioning
- Maintain: NHS IT services (£6M TAM, 40% win probability) = Good win probability but smaller TAM
- Avoid: Education IT services (£4.3M TAM, 10% win probability) = Low TAM and low win probability
How Tracker Intelligence Accelerates Total Addressable Market Calculation in the UK
The methodology above is sound. But it’s also time-intensive. Manual TAM calculation typically takes 4–6 weeks of analyst time. Teams using procurement intelligence platforms can reduce this to 4–6 hours.
Here’s how:
CPV/category mapping and filtering: Automatically categorise awards by CPV; filter by specific CPVs in seconds instead of manually reviewing hundreds of contracts.
Buyer/region/framework filters: Filter by buyer type, region, and framework eligibility without manually checking each award.
Award value rollups and de-duplication: Automatically aggregate award values; identify and flag duplicates without manual reconciliation.
Contract end-date visibility and renewal forecasting: See contract end dates; forecast when renewals will be published; identify high-concentration windows automatically.
Exports to CSV/Excel: Export segmented data for further analysis in your tools.
Live dashboards for segment comparison: Visualise TAM by CPV, buyer type, region, and framework side-by-side.
Saved searches to operationalise the TAM workflow: Create reusable searches; update TAM quarterly without starting from scratch.
The business impact: Update TAM quarterly (not annually) as new award data is published. Make hiring and partnership decisions based on data, not guesswork. Spot framework renewals 6–12 months in advance; plan bids proactively. Identify incumbent concentration and bidding patterns; benchmark your pricing.
Quantify the time savings: Manual TAM calculation takes 4–6 weeks of analyst time. Platform-enabled TAM calculation takes 4–6 hours. That’s 80–90 hours saved per TAM update = £2,000–5,000 in labour costs per update. The ROI is immediate.
Be Proactive with Your Total Addressable Market
Quantifying your total addressable market in UK public procurement is not optional—it’s essential for strategic planning and competitive success. Most suppliers are operating with incomplete market visibility, missing renewal windows, and bidding blind on competitor activity. The suppliers winning most consistently are those with the clearest visibility of their addressable market and the earliest warning of renewal cycles.
The methodology outlined in this guide is proven. Start with the formula, segment by CPV and buyer type, forecast renewal cycles, and validate your totals using multiple lenses. The result: a data-driven go-to-market strategy that guides your team towards the highest-value opportunities.
The next step is to gather your award data and start building your TAM model. If you’re starting from scratch, this might take 4–6 weeks. If you’re using a procurement intelligence platform, you can have a defensible TAM model in 4–6 hours. Either way, the investment pays for itself in the first quarter through better resource allocation and higher win rates.
Ready to build your TAM? Book a personalised walkthrough with the Tracker Intelligence team to stand up a defensible UK public procurement TAM this week. We’ll show you how to calculate TAM, segment by buyer and framework, and forecast renewal cycles—all in your first session.
