Snagging Before Completion vs After: Which Is Better for New Build Buyers?

The Core Principle: Leverage Follows Money

The fundamental reason pre-completion snagging is more powerful than post-completion snagging is simple: before you complete, the developer needs your purchase price. After you complete, the developer has your money. This asymmetry does not mean post-completion snagging is worthless — your NHBC warranty and NHOS rights remain intact — but it does mean that your negotiating position is at its strongest before keys are handed over.

Pre-Completion Inspection: Advantages

**1. Maximum leverage**

If the snagging inspection reveals material defects, you have a legal basis to refuse to complete until they are rectified (subject to your conveyancer's advice on the contract terms). Many buyers are uncomfortable asserting this right, but it is legitimate and effective.

**2. Defects fixed before you move in**

A pre-completion inspection means you move into a property where the defects have already been resolved — or at minimum, where the developer has committed to a remedial programme in writing before you handed over your money. This is far preferable to living in a construction site for weeks post-completion.

**3. Better access to all areas**

In a completed but unoccupied property, every room is accessible, floor coverings are visible at all edges, and you can inspect under sinks and behind appliances without moving furniture. Once you have moved in, access becomes messier.

**4. Independent inspector access is easier to arrange**

Developers are more likely to accommodate a professional snagging inspector pre-completion, when the property is still officially on-site. Some developers — particularly those subscribed to the New Homes Quality Code — are contractually required to permit a pre-completion inspection.

Pre-Completion: The Practical Challenges

**Developers often resist it.** Many housebuilders will inform you that "the property is not ready for inspection" or will offer only a brief accompanied walk-through. This is partly legitimate (snagging a genuinely unfinished property is premature) and partly tactical.

Under the **New Homes Quality Code**, developer subscribers must allow buyers a reasonable opportunity to inspect the property before completion. If your developer is a Code subscriber and is refusing a pre-completion inspection, you have grounds to invoke the Code.

**Timing is tight.** Developers typically give buyers 10–14 days' notice of a completion date. Arranging a professional snagging inspector at short notice in that window can be difficult. Build a relationship with a local snagging firm early in the purchase process so you can mobilise quickly.

**The property may be finished in stages.** External works, landscaping, and some communal areas in apartment blocks are frequently incomplete at legal completion. Pre-completion snagging will not capture defects in areas that are not yet finished — you will need to follow up on those post-completion.

Post-Completion Inspection: What You Lose and What You Retain

**What you lose:**

• The ability to withhold completion funds as leverage
• The opportunity to resolve defects before moving in
• Typically, some ease of access to certain areas

**What you retain:**

• The full two-year NHBC builder period for reporting defects
• Access to NHBC's Resolution Service if the developer is unresponsive
• NHOS rights (if developer is a Code subscriber)
• Your contractual rights under the Consumer Rights Act 2015

Post-completion snagging is still emphatically worthwhile. Many buyers who did not have the opportunity for a pre-completion inspection carry out a thorough post-completion inspection within the first few weeks of moving in — before furniture and belongings obscure access — and submit a comprehensive list to the developer.

The Hybrid Approach

The most effective strategy for buyers who can achieve it:

1. Carry out (or commission) a **pre-completion inspection** and submit the snagging list before completion

2. Negotiate a **retention** (a sum held back from the purchase price pending resolution of the most significant items) — though this is rarely agreed by developers on standard reservation agreements

3. Within the first **30 days post-completion**, re-inspect and add any items missed or newly apparent, submitting a supplementary snagging list

Our [new build snagging calculator](/new-build-snagging-calculator) allows you to model different scenarios based on your property type, the number of snags identified, and whether the inspection was pre- or post-completion, so you can estimate the value at stake.

A Note on Legal Completion and Your Conveyancer

Your conveyancer's advice on whether to withhold completion in response to a snagging report is critical. Completion is a contractual obligation; refusing to complete without legal basis can expose you to penalties. However, if the developer has materially misrepresented the standard of the finished property, there may be grounds for delay. Always take your conveyancer's advice before making any decision to delay completion.