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There is no universal winner. Pre-leasing, including build-to-suit (BTS), is usually the safer route when a credible occupier is identified, the facility has specialised requirements, or carrying unleased space would strain the project. Speculative construction can work when several plausible tenants need the proposed product, competing supply is limited, and the developer can fund a slower lease-up under a realistic downside case. The decision must be made at submarket and building level—not from a headline vacancy rate alone.
What pre-leasing and speculative construction mean
The two strategies differ mainly in who carries leasing risk while the building is being designed, built and stabilised.
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Pre-leasing
Pre-leasing means securing a tenant commitment before completion. The commitment may cover all or part of the building and can range from an executed lease to a conditional agreement that still requires approvals, financing, planning or other milestones. It reduces uncertainty about occupancy and income, but it does not remove construction, programme, tenant-credit, completion or lease-commencement risk.
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A build-to-suit is a pre-leased project developed around an identified occupier’s operating requirements. Those requirements can include unusual power capacity, clear height, cold storage, automation allowances, yard geometry, loading arrangements or specialised production space. BTS can protect against building the wrong product, but it creates concentration risk: if the tenant changes plans, defaults or cannot take possession, a highly customised facility may be difficult and expensive to re-let.
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Speculative construction
Speculative, or “spec,” construction starts without a signed tenant for all or part of the space. The developer funds the building on the expectation that demand will absorb it. The reward is a completed asset that can be offered to multiple occupiers and delivered quickly to a tenant whose timing does not match a long pre-construction programme. The trade-off is that the developer retains lease-up, incentive, interest and operating-cost exposure until the space is committed.
Quick comparison for an initial screening
| Decision issue | Pre-leasing or BTS | Speculative construction |
|---|---|---|
| Tenant certainty | A credible occupier is identified and willing to commit, subject to documented conditions. | Demand must be demonstrated by several plausible tenants, active requirements and comparable take-up. |
| Building design | Scope follows the occupier’s operating brief; bespoke work must be tested for re-letting risk. | The shell and services should suit multiple tenant types without costly alterations. |
| Capital exposure | Lower lease-up exposure, but construction and tenant-credit risks remain. | The developer carries construction, interest, operating and concession costs during lease-up. |
| Speed to market | Longer front-end process while requirements, approvals and lease terms are agreed. | Can offer ready or near-ready space to occupiers with urgent requirements. |
| Best evidence | Signed commitment, tenant credit, agreed specification, programme and funding. | Depth of tenant pool, recent absorption, competing availability, achievable rents and realistic lease-up history. |
| Main failure mode | A delayed, defaulting or overly customised tenant leaves stranded investment. | Space completes into a softer market and requires longer holding time, incentives or lower rent. |
When pre-leasing or BTS is the better fit
A real occupier has a deliverable requirement
Pre-leasing is strongest when the prospective tenant has a documented operational need, a credible balance sheet and authority to commit. Test whether the requirement is budgeted, whether the board or investment committee has approved it, and whether the lease remains binding after planning, funding and specification conditions are satisfied. A letter of intent is not equivalent to a signed lease; the underwriting should identify every condition that could delay or cancel the commitment.
The facility is specialised
Customisation is easier to justify when the tenant cannot operate efficiently in ordinary stock. Power availability, transport infrastructure, skilled labour, flexibility and early site selection are material occupier concerns for specialised projects, according to Cresa’s July 28, 2026 occupier outlook (Cresa, Industrial Real Estate Market: Occupier Outlook). A BTS brief should convert those concerns into measurable requirements: incoming electrical capacity, backup generation, floor loading, clear height, dock and trailer counts, refrigeration loads, automation zones, employee access and expansion options.
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Available supply is plentiful or uncertain
When functional space is readily available, a new unleased building must win against both existing stock and projects already under construction. Use availability by size, age, quality, location and building function. Older space may inflate a market-wide vacancy figure while offering little competition for a modern, high-power or automation-ready facility; the opposite can also occur if competing new buildings are delivering at the same time.
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Carrying costs are difficult to absorb
High construction and financing costs make unleased space more expensive to carry. CBRE’s 2026 U.S. outlook links those pressures to a constrained completion forecast and says speculative starts should remain limited while BTS activity holds steady (CBRE, U.S. Real Estate Market Outlook Midyear Review 2026, industrial chapter). If a project cannot withstand delayed rent, additional interest, taxes, insurance, maintenance and leasing commissions, pre-leasing may be the only financeable structure.
The negotiated lease supports the required return
A signed tenant does not automatically make a project viable. Compare the agreed rent, term, escalations, fit-out contribution, free-rent period, completion obligations, guarantees and exit assumptions with the actual land, construction, financing and professional costs. If the tenant’s specification or concessions consume the return target, redesign, reprice or stop before committing capital.
When speculative construction can be justified
There is a deep, evidenced tenant pool
Spec development needs more than a broker’s general optimism. Identify multiple potential occupiers whose size requirements, credit profiles, timing, industry use and location criteria match the proposed building. Review signed requirements, recent transactions, tours, rejected deals and competing projects. A single unverified prospect is not a tenant pool.
The proposed product matches the demand
Check the exact combination of building area, clear height, column spacing, power, yard depth, loading, parking, office percentage, access to motorways or ports and delivery date. A low vacancy rate cannot compensate for a mismatch in one decisive specification. A smaller, adaptable building may lease faster than a larger one if it fits the actual requirement set.
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Competing supply is limited in the relevant segment
Map existing available space and every announced, permitted and under-construction project that could deliver before and during lease-up. Separate functional, modern stock from obsolete or poorly located inventory. Model the effect of a competitor opening with better incentives, more power or an earlier completion date.
The developer can fund a downside case
Underwrite slower absorption, a lower starting rent, longer free rent, higher tenant improvements, additional leasing fees, construction overruns, delayed completion and refinancing at a higher rate. Include taxes, insurance, utilities, security and maintenance while vacant. The project should remain solvent without assuming a quick sale or a perfect refinancing window.
The building can be adapted or phased
Where practical, design a shell that can be divided, expanded or fitted for more than one use. Independent services, sensible demising lines, additional loading flexibility and reservable yard areas can broaden the tenant pool. Adaptability has a cost; include that cost in the base budget rather than treating it as free insurance.
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Published market reports illustrate why strategy must be local and period-specific. Their measures are not directly interchangeable: availability is not the same as vacancy, and forecasts are not realised outcomes.
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| Market and source | Reported evidence | How to use it |
|---|---|---|
| United States, CBRE 2026 | Industrial completions are forecast at roughly 260 million sq. ft. in 2026. Availability is forecast near 9.6% through year-end 2026. Net absorption is forecast at about 160 million sq. ft. in 2026 and approximately 210 million sq. ft. in 2027. | These are national forecasts. CBRE attributes the constrained completion outlook to high construction and financing costs, with limited speculative starts and steadier BTS activity. Do not treat the figures as a site-level leasing probability. Source |
| Canada, Cushman & Wakefield Q2 2026 | National industrial vacancy was 5.4%; Montreal was 7.7% and Calgary 4.7%. Absorption was 3.7 million sq. ft. in Q2 and approximately 4.9 million sq. ft. in H1. Speculative deliveries were about 86% of year-to-date deliveries, while completed speculative projects in the quarter were 29.4% pre-leased at delivery. | The report says existing-inventory demand absorbed incoming vacancy without meaningful upward pressure on overall vacancy that quarter. It is a Canada-wide, quarter-specific example—not proof that unleased deliveries are generally harmless. Source |
| United Kingdom, CBRE midyear 2026 | Logistics vacancy was 7.13% in Q2. The South West and South East were 9.4% and 9.1%; the West Midlands was 5% outside Scotland. BTS represented 66% of stock under construction. H1 completions totalled 6.2 million sq. ft.; 86% had started speculatively and most remained unlet at practical completion. | The regional spread and unlet completions show why national averages cannot set a project decision. CBRE reported that conditions for spec development were beginning to emerge in some segments, while costs and regional vacancy still mattered. Source |
| Tertiary markets, NAIOP Research Foundation 2021 | In a survey of 193 real estate professionals about small buildings in tertiary markets, 41.2% reported experience in tertiary markets. The brief identifies perceived disadvantages including fewer financing sources, longer lease-up and lower tenant credit quality. | The respondents largely had limited tertiary-market experience, and the evidence is from 2021. Treat it as a perception study, not a current universal rule. Source |
CBRE’s U.S. outlook also identifies reshoring, outsourcing to third-party logistics providers and advanced manufacturing as structural leasing drivers, while noting that occupiers are moving from older buildings into newer functional space. Cresa similarly describes a more normalised leasing market after the pandemic expansion and continued pressure on new-construction costs. Those themes can support a project thesis, but they do not replace local evidence on the specific site, product and delivery window.
Build a project-level decision before committing capital
- Define the product. Record target area, clear height, structural grid, floor loading, dock ratio, trailer parking, office allowance, power, sustainability requirements, automation provisions and subdivision options. Mark each item as essential, preferred or optional.
- Map the occupier universe. List named companies and tenant types that could use the building. For each, record required size, rent range, timing, credit, location constraints, power and yard needs. Distinguish active requirements from general enquiries.
- Collect comparable market data. Obtain current submarket vacancy and availability by building class and size, recent take-up, achieved rents, incentives, signed leases, deliveries, starts and active requirements. Verify whether each comparable is genuinely functional competition.
- Test infrastructure and planning. Confirm utility capacity and connection dates, transport access, labour availability, environmental constraints, planning status, permitted use, stormwater requirements and any off-site works. A tenant commitment is not useful if the site cannot deliver its operating brief.
- Price both strategies. For pre-leasing, include tenant-specific design, approvals, contingencies, fit-out, guarantees and lease conditions. For spec, include marketing, commissions, tenant improvements, free rent, vacant operating costs and the time value of money until stabilisation.
- Run downside cases. Stress a delayed opening, construction-cost increase, slower lease-up, lower rent, higher incentives, tenant default and a weaker exit valuation. Show the month in which cash becomes negative and the funding required to survive it.
- Check financing conditions. Confirm lender requirements for pre-leasing, tenant credit, loan-to-cost, interest reserves, completion tests, leasing covenants and refinancing assumptions. A project that works only if a lender waives a covenant is not underwritten conservatively.
- Choose a go/no-go trigger. Set objective conditions such as an executed lease, minimum pre-lease percentage, utility confirmation, fixed-price tenders, planning consent or a minimum number of qualified prospects. Do not substitute enthusiasm for a trigger.
Compare the financial exposure explicitly
| Underwriting line | Pre-leased project | Speculative project |
|---|---|---|
| Revenue start | Based on contractual commencement, practical completion and any rent-free period. | Based on a probability-weighted lease-up schedule, not the practical-completion date. |
| Tenant improvements | Usually defined by the agreed brief; price changes and landlord-versus-tenant responsibility clearly. | Carry an allowance broad enough for the target tenant pool and test above-budget fit-outs. |
| Leasing costs | Include legal, agency and documentation costs even when the tenant is known. | Include repeated marketing, agency fees, legal work and incentives for one or more leasing rounds. |
| Vacant operating costs | Allow for delay, early termination and non-payment scenarios. | Carry the full vacant building budget through the downside lease-up period. |
| Exit risk | Analyse tenant credit, lease expiry, renewal probability and re-letting cost. | Analyse stabilisation timing, rent evidence, competing supply and buyer yield assumptions. |
| Flexibility value | Measure the cost of custom work that cannot be reused by another occupier. | Measure the cost and benefit of subdivision, additional services and alternative uses. |
Construction and leasing controls that reduce risk
For a pre-leased or BTS project
- Use a detailed employer’s requirements document with measurable performance standards, testing procedures and acceptance criteria.
- Define long-lead equipment, utility responsibilities, design freeze dates and the process for tenant changes.
- Set practical-completion, sectional-completion and rent-commencement rules that match the construction programme.
- Agree remedies for delay, force majeure, access, commissioning and defects before works begin.
- Limit bespoke elements that have little re-letting value unless the tenant pays for them or provides adequate security.
- Verify guarantees, parent support, deposits or other credit protections in proportion to the tenant’s obligations.
For a speculative project
- Prioritise a flexible structural grid, service distribution and loading arrangement that can serve several tenant profiles.
- Phase fit-out and non-essential works so capital is not spent before a tenant’s requirements are known.
- Preserve options for subdivision, separate metering, independent access and multiple lease commencements.
- Maintain a leasing schedule tied to construction milestones; early marketing cannot repair an uncompetitive specification.
- Secure contingency funding for the period after completion, when warranty, security and maintenance costs continue without rent.
Specialised facilities need a different test
Power-intensive manufacturing, cold storage, automated distribution and facilities with unusual environmental or yard requirements can justify BTS even when broad industrial demand is strong. The reason is not simply that the building costs more; it is that the pool of replacement tenants may be materially smaller. Confirm utility delivery dates, network capacity, permitting, labour and transport before treating a tenant’s requirement as deliverable. Cresa’s occupier outlook specifically highlights reliable power, transport infrastructure, skilled labour, flexibility and early site selection as concerns for specialised projects (Cresa, July 28, 2026).
Spec construction can still work for specialised space when several occupiers share the same technical profile and the shell can be adapted. Document that commonality with actual requirements rather than assuming that one successful tenant proves a broad market.
Illustrative decisions
Example: regional distribution building with several active requirements
Suppose a site can deliver a conventional warehouse with standard loading, good motorway access and a programme that matches several active requirements. If competing new supply is limited, the building can be divided and the developer has funding for a slower lease-up, a spec start may capture tenants that cannot wait through a full design-and-build period. The conclusion would still depend on rent evidence, incentives, delivery timing and downside liquidity.
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Example: high-power manufacturing facility for one occupier
If one creditworthy manufacturer needs a large dedicated electrical connection, unusual floor loading and a specialised process layout, BTS is generally more defensible. The lease should address utility delays, commissioning, change control, completion testing and the cost of any elements with little value to a successor tenant.
Example: small building in a thin tertiary market
A small project outside a major logistics hub may face fewer financing sources, a longer lease-up and weaker tenant credit. The NAIOP Research Foundation’s 2021 brief reports those as perceived disadvantages in tertiary-market development, while warning that its respondent pool had limited direct experience. Treat the finding as a prompt for conservative underwriting, then obtain current local evidence before choosing spec or BTS.
Common mistakes to avoid
- Using headline vacancy alone: Pair vacancy with availability, absorption, rents, incentives, building quality, size and pipeline.
- Calling an expression of interest a pre-lease: Identify whether the document is binding and list every condition.
- Ignoring delivery timing: A project can be well located yet complete after the tenant pool has already leased competing space.
- Assuming low vacancy guarantees fast leasing: A particular building may miss the required power, yard, access, size or rent.
- Underpricing concessions: Free rent, fit-out, commissions and legal costs can materially change returns even when headline rent looks adequate.
- Over-customising a BTS building: Separate mission-critical works from items that create stranded capital.
- Leaving construction risk outside the lease: Programme, testing, access, delay and change obligations must align with the contract documents.
- Confusing a national forecast with a local forecast: The U.S., Canadian and UK figures above describe different markets and periods; they cannot be combined into one probability or threshold.
Bottom line for developers
Choose pre-leasing or BTS when a real occupier’s requirements are documented, the tenant is creditworthy, specialised work would narrow the replacement market, or vacant carrying costs are hard to finance. Consider spec when multiple credible tenants need the exact product, competing functional supply is constrained, and the developer can fund a downside case through slower leasing and higher incentives. The decisive evidence is local: current submarket availability and absorption, the delivery pipeline, achieved rents, tenant requirements, utility and labour conditions, construction pricing, lender terms and a realistic exit. Market reports can frame the decision, but only project-specific underwriting can establish whether the strategy fits.
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