A polished marketing suite and a set of computer-generated images can make an off-plan purchase feel further advanced than it is. For an investor, understanding how to assess construction progress means separating visible activity from meaningful delivery milestones – then judging what those milestones mean for exchange, mortgage timing, rental income and completion risk.
Construction is rarely linear. A building can appear to have changed little for several weeks while critical mechanical, electrical, fire-safety or internal works are under way. Equally, a structure that looks impressive from the street may still be some distance from practical completion. The most useful assessment combines developer evidence, independent checks where appropriate, contractual dates and a realistic view of the remaining programme.
Start with the programme, not the façade
The right question is not simply, “How much has been built?” Ask instead: “Which contractual and construction milestones have been achieved, and what remains before my flat can complete?”
A credible developer or sales agent should be able to explain the anticipated completion window, the current stage of the scheme and the next major works. On a larger development, completion may be phased. One block, floor or core can be progressing towards handover while another remains at an earlier stage. Make sure any update relates specifically to the building and unit type you are purchasing.
The principal stages usually include:
- site preparation, foundations and substructure works;
- superstructure construction, including the frame, floors and roof;
- external envelope work, such as brickwork, cladding, windows and weatherproofing;
- first-fix and second-fix internal services, partitions, kitchens, bathrooms and finishes; and
- testing, certification, snagging, practical completion and legal completion.
These milestones do not carry equal weight. Reaching roof level is a substantial achievement, but the fit-out and sign-off period can still take many months. In a city-centre flat scheme, lifts, communal systems, fire doors, ventilation, utility connections and landscaping can all influence the final handover date.
Review the evidence behind construction progress
A monthly email with a few site photographs is useful, but it should not be the whole due-diligence process. Look for consistency between photographs, written commentary and the expected programme. Images should be dated and show identifiable parts of the development rather than only carefully selected close-ups.
Ask whether the developer provides formal construction updates and whether the anticipated completion period has changed since reservation or exchange. A revised timeframe is not automatically a warning sign. Weather, supply chains, planning conditions and utility works can affect any programme. What matters is whether the explanation is specific, proportionate and supported by a credible revised plan.
For a purchase made before construction is complete, your solicitor should review the contract documentation. This should clarify the longstop date, notice provisions, deposit protections, specification, permitted variations and the circumstances in which either party may have rights to terminate. The completion estimate in sales material is not necessarily the same as the legal completion mechanism in your contract.
You should also establish which new-build warranty provider is involved and when the relevant cover is expected to become available. Warranty cover is not a substitute for thorough due diligence, but it is a material part of the protection and lending framework for many newly built homes.
Use site visits carefully and ask better questions
A site visit can bring the scheme to life, particularly where a development is approaching completion. It can also be misleading if it becomes a visual inspection carried out without context. Construction sites are controlled workplaces, so access may be limited for safety and insurance reasons. Do not treat restricted access as evidence of a problem.
Where a managed visit is available, compare what you see with the latest update. Is the external envelope substantially complete? Have windows been installed? Are internal corridors, communal areas and amenity spaces taking shape? Do the works appear active, with trades, materials and equipment on site? These observations can indicate momentum, but they cannot confirm building quality or compliance.
Ask direct questions: Which stage is my block at? Have kitchens and bathrooms been ordered or installed? Are utilities connected? When are the lifts due to be commissioned? Is practical completion anticipated before or after the stated completion window? Clear answers are more valuable than broad reassurance.
For a development such as Boulevard, where lifestyle amenities form part of the tenant appeal, it is also sensible to ask when shared lounges, fitness facilities, gardens and workspaces will be operational. A flat may legally complete before every non-essential communal feature is fully open. That does not necessarily undermine the investment, but it can affect early tenant experience and the first months of marketing.
Understand what practical completion means
Practical completion is a significant point in the programme. Broadly, it indicates that the building or relevant unit is complete enough for its intended use, subject to minor outstanding items. It does not mean that every snag has been resolved or that all marketing imagery will precisely match the finished scheme.
After practical completion, the developer may serve notice to complete under the terms of the sale contract. This is when purchasers need their mortgage, deposit balance and legal arrangements ready. If you are buying with an interest-only mortgage, speak to your broker well ahead of this stage. Your financial position, lending criteria and valuation are assessed at the time of the mortgage application and offer, not merely when you reserved the flat.
A lender’s valuation deserves particular attention. The surveyor considers the individual property, comparable evidence, local market conditions and the lender’s requirements. It may support the agreed price, but it may also come in lower. If there is a down valuation, you may need to increase your cash contribution, renegotiate where contractually and commercially possible, find alternative finance or consider your legal options. None of these outcomes should be assumed.
Track the financial impact of delay
A later completion date can have practical consequences even where the build itself remains sound. Your projected gross rental income will start later, while mortgage product expiry dates, exchange deadlines and personal cashflow assumptions may need to be revisited.
Build a contingency into your investment appraisal from the outset. Include deposit funds, legal fees, mortgage costs, furnishing if relevant, service charge, ground rent where applicable, insurance and an allowance for the period between completion and the first tenancy. Do not rely solely on a headline rental figure. Your net cash return depends on voids, management fees, finance costs, maintenance and tax treatment, as well as rental income.
For overseas buyers, allow additional time for identification checks, source-of-funds evidence, currency transfers and mortgage documentation. A well-managed purchase process can reduce avoidable pressure, but it cannot remove market, valuation or construction risk.
Arrange an inspection before handover
Once completion is close, arrange for your legal representative to confirm the formal requirements and consider commissioning an independent snagging inspection where access and timing permit. A snagging survey identifies defects or incomplete items, from cosmetic marks to poorly fitted joinery or issues with finishes. It is not the same as a structural survey, and it should be undertaken by a suitably qualified professional.
Keep a written record of any reported snags, agreed remedial actions and dates. Minor defects are common in new-build homes and are normally dealt with through the developer’s handover and aftercare process. The key is to distinguish manageable snagging from issues that may affect safety, habitability, mortgageability or the ability to let the flat.
Assess progress with a completion mindset
The strongest buyers do not try to become construction experts from a series of photographs. They use evidence to make informed commercial decisions: checking the programme, understanding their contract, keeping finance current and planning for the point at which the asset becomes a home and an income-producing rental property.
If a completion date moves, request a clear update, ask your solicitor and broker what it means for your position, and revisit your assumptions rather than reacting to headlines. Property values and rental income can rise or fall, construction timelines can change, and projections are not guarantees. A measured, well-documented approach gives you the best chance of reaching completion prepared – and of starting the next stage of ownership on sound footing.