Volunteer Swift Survey Guidance

Published: 21 May 2026

Volunteer Swift Survey Guidance

This guide brings together the key survey methods and field experience used by Derbyshire Swift Conservation (DSC) to help volunteers collect accurate, consistent, and useful Swift data.

Across the UK, most Swift conservation work is carried out by volunteers. Your observations help us identify nesting colonies, monitor changes over time, and protect Swift nest sites.

Why Swift Surveys Matter

Swift surveys help us to:

Locate and confirm nesting sites
Monitor active breeding colonies
Track changes in Swift populations
Support conservation planning and protection
Build reliable long-term records across Derbyshire

By using standardised methods, volunteers can collect data that is scientifically useful and comparable between years and locations. You can find out more about the challenges facing Swifts here.

Understanding Swift Behaviour

Knowing a little about the Swift breeding season helps explain why we survey at particular times.

When Swifts Arrive

Swifts are only in the UK for a short breeding season, usually from late April until early August.

Typical breeding timeline

Arrival (late April): males often arrive first to reclaim nest sites
Pair bonding and nest repair: several days to a week
Egg laying: approximately 10 days after pairing
Incubation: around 19–20 days
Hatching: usually mid-June
Peak feeding period: mid-June to late July

The busiest period for adult birds visiting nests is when chicks are being fed — which is why this is the best survey window. Older breeding birds often arrive earlier. Younger birds may arrive later and may not breed in their first year.

Before You Begin: Choose Your Survey Area

Think about places where Swifts may already nest.

Helpful starting points include:

Existing local knowledge
Historic Swift records
Reports of “screaming parties”
Older buildings with roof gaps or eaves
Terraces or streets with previous Swift activity

You can also use Swiftmapper to check for records nearby.

Look Out for “Screaming Parties”

These are groups of Swifts flying fast and calling loudly around buildings.

They are important because:

They often indicate nearby breeding colonies
Young non-breeding birds investigate potential nest sites
They help identify areas worth surveying further

Preliminary walks in May can be very useful for locating these activity areas.

Choosing the Right Survey Method

DSC mainly uses two core methods:

Street Surveys (Survey Walks)
Constant Effort Static Counts (“Statics”)

A third method — Call-Back Surveys — can also help identify new nest areas early in the season.

1. Street Surveys (Survey Walks)

Best for:

Surveying several nests along a street
Monitoring larger areas
Checking known nesting streets
Finding additional nests nearby

This is the most commonly used survey method.

How It Works

Surveyors walk slowly along a street or transect while:

Recording active nests
Watching for birds entering or leaving buildings
Looking for previously unknown nests

At known nest locations, surveyors stop for around 20 minutes to check whether nests are occupied.

Why We Use Street Surveys

Surveying every nest individually takes a huge amount of time.

Street surveys allow volunteers to:

Cover larger areas efficiently
Monitor multiple nests in a single session
Identify new nesting sites near known colonies

They work particularly well where several nests occur close together.

How Long Does a Street Survey Take?

Typically:

Around 1 to 1.5 hours
Longer streets or busy colonies may require additional visits

Best Time of Day

Street surveys work best:

In the morning
Or in the evening

Avoid afternoon surveys whenever possible, as Swift activity is usually lower then.

2. Constant Effort Static Counts (“Statics”)

Best for:

Individual buildings
Short terraces
Confirming nest entrances
Detailed nest monitoring

This is often the most accurate survey method.

How It Works

Observers remain stationary and continuously watch a building or terrace.

Each survey:

Uses two observers where possible
Lasts for a minimum of 1 hour
Records all Swift activity during that period

Surveys can be extended if needed to confirm nest entrances or wait for adults returning to roost.

Why Static Counts Matter

Static counts are a constant effort technique.

Because every survey lasts the same amount of time, we can:

Compare sites fairly
Compare data between years
Assess whether populations are changing

Without standardised survey effort, we can only map nests — not measure trends reliably.

Important: Keep a Time Log

If surveys continue beyond 1 hour:

Record what was seen in the first hour
Record additional observations separately

This allows the standardised one-hour counts to remain comparable.

Best Time for Static Counts

Evenings are best.

Ideal survey window:

7pm–9:30pm
Sometimes later in midsummer (up to 10pm)

Warm, still summer evenings are ideal conditions.

Staying late can help confirm exact nest entrances when adults return to roost.

3. Call-Back Surveys

Best for:

Preliminary surveys
Locating previously unknown nest areas
Early season work (May–June)

How It Works

Two volunteers walk a street while playing short bursts of Swift calls from a mobile phone.

Nesting birds may respond from inside buildings.

Important Rules

Play calls only once at each stop
Use short bursts (around 30 seconds)
Never repeatedly play calls at the same location
Avoid disturbing nesting birds

DSC can provide suitable Swift call recordings.

Best Time

Early morning (around 6am)
Low traffic noise improves listening conditions

Why Repeat Visits Are Essential

Repeat surveys greatly improve accuracy.

They help us:

Confirm active nests
Identify exact nest entrances
Distinguish entrances from exits
Detect multiple nests using the same area

Swifts enter nests extremely quickly, so seeing repeated behaviour is important.

How Often Should Surveys Be Done?

Each survey location should normally be visited twice:

One visit in June
One visit in July

Busy streets or difficult sites may require additional visits.

DSC is also trialling:

May + June + July surveys in some areas

Weather Conditions

Always Survey in Dry Weather. Poor weather dramatically reduces Swift activity.

Why?

Wet weather reduces flying insects
Swifts travel long distances to find food
During storms they may travel hundreds of miles away
Adults return to nests less frequently in poor weather

Surveying in rain or damp conditions usually produces very few records.

Best Survey Conditions

Ideal weather conditions are:

Dry
Warm
Still
Clear evenings

The best time of day is:

Evening
Or any time before midday

The worst time is generally:

Afternoon

What Information Should Be Recorded?

DSC uses a standard survey form found here. Make a new submission for each nest observed (for compound nesting boxes with multiple nests, use field 10 to tell us how many nests are in use at that site).

Please record the following for each active or suspected nest:

Email address of observer* (For administrative and data validation purposes)
Name(s) of observer(s)*
Date and time of observation*
Start or end or survey (Use this field if the submission either marks the first or last of the suggested 1 hour survey period)
Weather (Weather at time of observation—ideal conditions are dry, warm, still and clear)
Location* (Full property address including post code)
Grid reference* (Please use the full 10 figure reference as provided using OS map)
Building Aspect (relative)* (Position of nest relative to the orientation of the building, e.g. front, back, right-hand side, etc)
Building Aspect (cardinal)* (Position of nest relative to points on a compass, e.g. North, South, East, West)
Number of Nests at Location (Only complete this if there is more than one nest at this specific grid location)
Building Feature* (Adjacent notable building features, e.g. window, downpipe, alarm box, gutter)
Nest entrance* (Using Building feature as a reference, describe as accurately as possible the exact location)
Artificial or natural nest* (Label as natural, box or brick)
Risk Assessment* (Assess perceived risk to nest as Red, Amber, Green)
Notes (Any additional observations of interest, e.g. notable bird behaviour, risk, etc)

Photographs: Please do take photographs of nests if possible. Please clearly name them with the grid reference entered on the form in the format "DSC-SNS-SKXXXXXXXX.jpg" and email them to info@derbyshireswiftconservation.org.

The more precise the nest entrance description, the more useful the record becomes.

Good Survey Practice

Always

Survey safely near roads and traffic
Respect residents and private property
Be patient and observant
Record information clearly and accurately
Use DSC methods consistently

Remember

Even surveys where no nests are found are still valuable.
Negative results help improve our understanding of Swift distribution.

Support and Resources

Derbyshire Swift Conservation can provide:

Swift call recordings
Training and guidance materials
Advice on identifying nest sites

Good luck!