diff --git a/app/(dashboard)/sga-spaces/space-booking-modal.tsx b/app/(dashboard)/sga-spaces/space-booking-modal.tsx
index 46c092d..4af54b3 100644
--- a/app/(dashboard)/sga-spaces/space-booking-modal.tsx
+++ b/app/(dashboard)/sga-spaces/space-booking-modal.tsx
@@ -266,6 +266,7 @@ export default function SpaceBookingModal({
       }
 
       setSeries(info)
+      setSelectedSpaceId(info.space_id)
       setTitle(info.title)
       setStartTime(info.start_time)
       setEndTime(info.end_time)
@@ -328,8 +329,8 @@ export default function SpaceBookingModal({
           method: 'PATCH',
           headers: { 'Content-Type': 'application/json' },
           body: JSON.stringify({
-            title: title.trim(), start_time: startTime, end_time: endTime, until, attendee_ids,
-            external_attendees, skip_conflicts: skipConflicts,
+            space_id: selectedSpaceId, title: title.trim(), start_time: startTime, end_time: endTime, until,
+            attendee_ids, external_attendees, skip_conflicts: skipConflicts,
           }),
         })
       } else if (creatingSeries) {
@@ -384,6 +385,7 @@ export default function SpaceBookingModal({
   const seriesMaxDate = editingSeries ? series?.semester_end_date ?? undefined : semesterEndDate ?? undefined
   const cancelLabel = editingSeries ? 'Cancel all upcoming weeks' : seriesId ? 'Cancel this week' : 'Cancel this booking'
   const canCancel = editingSeries ? !!onCancelSeries : !!onCancelBooking
+  const busyIds = editingSeries ? undefined : busySpaceIds
 
   return (
     <div className="fixed inset-0 bg-black/60 backdrop-blur-sm z-50 flex items-center justify-center p-4" onClick={onClose}>
@@ -434,12 +436,13 @@ export default function SpaceBookingModal({
           )}
 
           {/*
-            Location selector. Offered when editing one booking -- or one week of
-            a series -- as well as when creating, so a meeting can follow a room
-            change instead of being cancelled and rebooked. Not for a series edit,
-            which keeps the series' space.
+            Location selector. Offered when creating and when editing -- one
+            booking, one week of a series, or the whole series (issue #127) -- so
+            a meeting can follow a room change instead of being cancelled and
+            rebooked. The busy markers describe the one time picked, so they are
+            left off a series, whose weeks are checked on the server.
           */}
-          {!editingSeries && spaces && spaces.length > 1 && (
+          {(!editingSeries || series) && spaces && spaces.length > 1 && (
             <div>
               <label className={labelCls}>Location</label>
               <select
@@ -448,10 +451,10 @@ export default function SpaceBookingModal({
                 className={inputCls}
               >
                 {[...spaces]
-                  .sort((a, b) => Number(!!busySpaceIds?.includes(a.id)) - Number(!!busySpaceIds?.includes(b.id)))
+                  .sort((a, b) => Number(!!busyIds?.includes(a.id)) - Number(!!busyIds?.includes(b.id)))
                   .map(s => (
                     <option key={s.id} value={s.id}>
-                      {s.name} (cap. {s.capacity}){busySpaceIds?.includes(s.id) ? ' — booked at the time you picked' : ''}
+                      {s.name} (cap. {s.capacity}){busyIds?.includes(s.id) ? ' — booked at the time you picked' : ''}
                     </option>
                   ))}
               </select>
diff --git a/app/api/spaces/series/[id]/route.ts b/app/api/spaces/series/[id]/route.ts
index 971b716..17ead0a 100644
--- a/app/api/spaces/series/[id]/route.ts
+++ b/app/api/spaces/series/[id]/route.ts
@@ -40,7 +40,9 @@ import { loadActiveSemesterEnd, loadPlanContext } from '@/lib/space-series-data'
  *
  * A series edit overwrites each upcoming week with the series' values, including
  * weeks that had been edited on their own. That is the rule chosen for #112: the
- * series is what you see.
+ * series is what you see. That includes the space (issue #127): moving a series
+ * moves every upcoming week that can take the move, so a meeting can follow a
+ * room change without being cancelled and rebooked.
  */
 
 const adminSupabase = createAdminClient(
@@ -162,7 +164,7 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
     return NextResponse.json({ error: 'This weekly booking has been cancelled.' }, { status: 400 })
   }
 
-  const { title, start_time, end_time, until, attendee_ids, external_attendees, skip_conflicts } = await request.json()
+  const { title, start_time, end_time, until, attendee_ids, external_attendees, skip_conflicts, space_id } = await request.json()
 
   if (typeof title !== 'string' || !title.trim()) {
     return NextResponse.json({ error: 'Title is required.' }, { status: 400 })
@@ -174,6 +176,13 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
   const externals = parseExternalAttendees(external_attendees)
   if (!externals) return NextResponse.json({ error: EXTERNAL_ATTENDEES_ERROR }, { status: 400 })
 
+  // Omitted means the series stays where it is.
+  const spaceId: string = typeof space_id === 'string' && space_id ? space_id : series.space_id
+  if (spaceId !== series.space_id) {
+    const { data: space } = await adminSupabase.from('spaces').select('id').eq('id', spaceId).maybeSingle()
+    if (!space) return NextResponse.json({ error: 'That space does not exist.' }, { status: 400 })
+  }
+
   // The time pattern is validated once on the first date; every week shares it.
   const sample = intervalFor(series.starts_on, start_time, end_time)
   if (new Date(sample.start).getUTCMinutes() % 15 !== 0 || new Date(sample.end).getUTCMinutes() % 15 !== 0) {
@@ -227,12 +236,12 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
 
   const weeks = [...moving, ...adding]
   const ctx = await loadPlanContext(adminSupabase, {
-    spaceId: series.space_id,
+    spaceId,
     creatorId: series.creator_id,
     from: weeks[0].interval.start,
     to: weeks.reduce((max, w) => (w.interval.end > max ? w.interval.end : max), weeks[0].interval.end),
   })
-  const { ok, conflicts } = planSeries({ ...ctx, spaceId: series.space_id, weeks })
+  const { ok, conflicts } = planSeries({ ...ctx, spaceId, weeks })
 
   const movingDates = new Set(moving.map(w => w.date))
   const unchanged: SeriesConflict[] = conflicts.filter(c => movingDates.has(c.date))
@@ -250,9 +259,10 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
   const okByDate = new Map(ok.map(w => [w.date, w]))
 
   // Every kept week takes the title and attendees. Only the weeks the plan
-  // accepted take the new time -- and the series' space, since a week moved to
-  // another space on its own was checked here as moving back. The rest keep
-  // their time and space, as the email says.
+  // accepted take the new time and space -- a week sitting in any other space,
+  // whether the series is moving or the week was moved on its own, was checked
+  // as claiming all of its time here. The rest keep their time and space, as
+  // the email says.
   const updates = await Promise.all(kept.map(r => {
     const planned = okByDate.get(r.start_time.slice(0, 10))
     return adminSupabase
@@ -261,7 +271,7 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
         title: cleanTitle,
         attendee_ids: attendees,
         external_attendees: externals,
-        ...(planned ? { start_time: planned.interval.start, end_time: planned.interval.end, space_id: series.space_id } : {}),
+        ...(planned ? { start_time: planned.interval.start, end_time: planned.interval.end, space_id: spaceId } : {}),
       })
       .eq('id', r.id)
       .select('id, start_time, end_time, space_id')
@@ -276,7 +286,7 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
     const { data, error } = await adminSupabase
       .from('space_bookings')
       .insert(toInsert.map(w => ({
-        space_id: series.space_id,
+        space_id: spaceId,
         creator_id: series.creator_id,
         title: cleanTitle,
         start_time: w.interval.start,
@@ -297,7 +307,7 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
 
   const { error: seriesError } = await adminSupabase
     .from('space_booking_series')
-    .update({ title: cleanTitle, attendee_ids: attendees, external_attendees: externals, start_time, end_time, ends_on: until })
+    .update({ space_id: spaceId, title: cleanTitle, attendee_ids: attendees, external_attendees: externals, start_time, end_time, ends_on: until })
     .eq('id', id)
   if (seriesError) return NextResponse.json({ error: seriesError.message }, { status: 500 })
 
@@ -312,8 +322,8 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
         const withSpace = (r: { id: string; start_time: string; end_time: string; space_id: string }) =>
           ({ ...toWeek(r), spaceId: r.space_id })
         const [finalWeeks, removedWeeks] = await Promise.all([
-          nameOtherSpaces(finalRows.map(withSpace), series.space_id),
-          nameOtherSpaces(removed.map(withSpace), series.space_id),
+          nameOtherSpaces(finalRows.map(withSpace), spaceId),
+          nameOtherSpaces(removed.map(withSpace), spaceId),
         ])
 
         // Chambers users and external addresses alike, as keys (see attendeeKeys).
@@ -326,7 +336,7 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
 
         const currentIds = [series.creator_id, ...currentAttendees]
         const [{ data: space }, addresses] = await Promise.all([
-          adminSupabase.from('spaces').select('name').eq('id', series.space_id).single(),
+          adminSupabase.from('spaces').select('name').eq('id', spaceId).single(),
           resolveSpacesAddresses(adminSupabase, [...currentIds, ...droppedAttendees]),
         ])
         const spaceName = space?.name ?? 'SGA Space'